Chamberlain Safety Gate Swing GATE User Manual
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Rev C  
INSTALLATION AND OPERATION INSTRUCTIONS  
FOR THE  
MODEL SW 2000-B1  
SWING GATE OPERATOR  
(-68 BOARD)  
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The LiftMaster Model SW 2000-B1  
The LiftMaster model SW 2000-B1 Swing Gate Operator is a full featured commercial gate operator  
with a master/slave wiring capability. The SW 2000-B1 contains the following features:  
• Dynamic motor braking limits gate overtravel.  
• Separated arm segment joints reduce the risk of injury to users.  
• Alternate action OPEN/CLOSE inputs.  
• Manual switch inputs override other commands.  
• Adjustable reclose timer.  
• Gate lock relay can be used for electromagnetic locks and CCTV cameras or  
lights.  
• Master-slave operation for two operators on bi-part gates and vehicle trap  
gates.  
• Selectable anti-tailgate function prevents two cars from entering on one open  
command.  
• Senses obstructions through adjustable Peak motor current senses.  
• Open Motor detection indicates when the motor is not drawing any current.  
• Two separate peak motor current sense adjustments for reversing direction  
or stopping; one for clockwise motion and the other for counterclockwise motion.  
• Initial inrush current sense adjustment offsets initial inrush current to the  
motor.  
• Automatic fault Re-Try causes the gate operator to retry an operation twice  
following a fault condition.  
• Selectable Automatic Gate Closure feature closes the gate when power is  
restored after an outage unless gate is at open limit.  
• Two 115 VAC accessory plugs provided.  
• 24 VAC accessory power provided.  
• 80:1 worm gear reduction.  
• Output torque limiter prevents damage to the gate operator caused by force  
pushing against the gate.  
• Handles any gate weight up to 1000 pounds and length up to 18 feet.  
• Diagnostic LEDs on controller board indicate gate operator actions and assist in  
troubleshooting.  
• Power Fail Operation option automatically opens or closes the gate (user's  
choice) if AC power fails.  
• Optional loop detector add-on boards plug into the controller board for  
Interrupts, shadow and exit loops.  
• Inside and outside Interrupt Loops enhance gate control and distinguish  
between entering and exiting traffic.  
• Optional cover access door provides easy access to the control box.  
DIMENSIONS  
WEIGHT  
ELECTRICAL  
Height  
Width  
Depth  
24”  
20”  
23”  
159 Lbs.  
115 VAC, Single Phase, 60 Hz., 8 amp  
(A separate 20 AMP circuit is  
required by most codes.)  
(172 Lbs. with Power  
Fail Operation option.)  
15 Lbs. Accessory Kit  
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SAFETY SUMMARY  
It is important for everyone involved in the installation and operation of the LiftMaster model SW  
2000-B1 Swing Gate Operator reads the following warnings.  
WARNING!  
•
A vehicle gate is a large, heavy object that is moved by an electric motor. A moving  
gate can cause serious injury or death! The safety and well-being of others depends  
on the installation of a safe system.  
•
•
Improper installation of a gate operator can result in a dangerous system.  
Gate operators can present serious hazards to persons in the immediate area when  
not controlled in a safe manner. Choose one or more controls which together will  
allow complete control of the gate. Most importantly, the gate must be able to be  
stopped at all times in case of emergency, and the emergency control should be  
conveniently located, clearly marked and visible.  
•
•
•
All controls must be kept out of the reach of small children. Serious injury or death  
can result from children playing with the controls.  
All controls should be located so the person operating them can see the full area of  
gate movement.  
Gate operators and associated control equipment should be installed by qualified  
professional installers who should observe the following safe installation  
procedures:  
1. Power should always be disconnected whenever installing, wiring or servicing a  
gate operator. Moving chains and belts in gate operators can catch clothing or  
fingers and cause severe injury.  
2. Installation of wiring should comply with all local building and electrical codes.  
3. All manual gate locks should be disabled to avoid damage to the gate or gate  
operator should the lock become engaged after the operator is installed.  
4. All operator controls and safety equipment should be tested at the conclusion of  
installation to be sure they are functioning properly.  
5. The operation of the gate controls and safety equipment should be reviewed with  
the owner and/or end user of the automated gate system. They should also be  
informed of the need to maintain control and safety equipment on a regular basis.  
Safety equipment should be checked monthly to ensure it is working properly. All  
installation manuals and safety information should be left with the owner.  
6. Moving gates have pinch points and entrapment zones which can be extremely  
dangerous to pedestrians, especially small children.  
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BASIC INSTALLATION HINTS AND RULES  
PLEASE READ THIS SECTION CAREFULLY BEFORE BEGINNING YOUR INSTALLATION.  
The sections that follow contain detailed procedures for installation of a model SW 2000-B1 system. In  
addition to these specific procedures, there are a number of general hints and rules which will help  
ensure that your installation will be done correctly and efficiently. These are discussed below.  
1. UNDERSTAND THE SYSTEM AND INSTALLATION SITE THOROUGHLY. The SW 2000-B1 is a  
flexible and reliable gate operator system, but the quality of service depends directly on the quality of  
installation. Please read these instructions carefully and study the applicable diagrams before planning  
your installation. In particular, understand any site characteristics that may affect the system  
installation.  
WARNING  
2. INSTALL PERMANENT WIRING. U.L. specifications require the SW 2000-B1 system to be  
permanently wired. Refer to your local wiring code for specific information.  
WARNING: Damage caused by faulty wiring is not covered by warranty.  
3. GROUND THE SYSTEM. The system contains parts which may be damaged by static discharge. A  
proper earth ground connected to the gate operator housing (see Figure 3) will significantly reduce the  
chances of damage or improper operation. The shielding in the cables specified for all remote sensors  
and controls should also be connected to earth ground at the controller end of the cable only.  
To be effective, the ground connection must be made by running 12 awg copper wire to a good ground  
point (e.g., an electrical panel, a metallic cold water pipe that runs into the earth, or a grounding rod at  
least 10 feet in length that is driven into the earth) within 12 feet of the system. Even if you have a  
good earth ground, you should try to discharge any static before handling the circuit boards.  
WARNING: Damage caused by static discharge and lightning is not covered by warranty.  
4. PROVIDE POWER FROM A DEDICATED SOURCE. The outlet into which you connect the Gate  
Operator should be wired to its own circuit breaker. This will reduce the line noise introduced into  
system power and minimize the risk of having other equipment interrupt system operation. In a  
Master/Slave system, Master and Slave must each have separate circuits.  
5. DO NOT OVERLOAD THE TERMINAL BLOCKS. The terminal blocks used in the gate operator are  
removable and the pins are soldered into the boards. To connect your wires, remove the "head" from  
the correct terminals and open the screws. Insert the wire into the correct opening on the front and  
tighten the screw until the wire is held firmly. When you have made all connections for a given "head",  
plug it back onto the pins designated for that terminal block.  
Stranded wire must be between 16 and 24 awg. Solid wire must be between 18 and 24 awg. This is  
the total thickness measurement so, if you are putting two wires in, the combined thickness must fall  
within this range. NEVER try to insert more than two wires per terminal.  
6. ENSURE GOOD CONNECTIONS. A light tug on the wire will tell you if the connection is secure.  
When reconnecting system components, make sure all pins are straight on chips, connectors, and  
terminal block heads.  
7. READ THE MARKINGS CAREFULLY. The connection points are marked on the boards clearly.  
Before making any connection, be sure to read the marking and check it against the corresponding  
figure in these instructions so that you understand the connection you are making.  
8. TRAIN YOUR CUSTOMERS THOROUGHLY. Although customer responsibility is limited to proper  
installation, the quality of service is determined by the care of system setup. Ensure that the customer  
has a copy of this manual to guide them. It will save you and them lots of inconvenience and  
aggravation later.  
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PART 1  
SITE PREPARATION  
A.  
LOCATION AND LAYOUT  
Figure 1. Gate Operator Layout Options.  
NOTES  
•
•
Left Gate and Right Gate are determined by looking from inside the complex toward the street.  
Figure 1 shows a typical Bi-Parting gate in standard and compact installations.  
1. Always install gate operators inside of the fence line, NEVER on the public side of the fence.  
2. Mount all manual controls and activating devices at least 6 ft. away from the gate for safety.  
3. Allow enough clearance around the gate and the gate operator for installation and service.  
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B.  
PAD AND MOUNT  
Figure 2. Pad and Mount.  
1. The concrete pad must be sufficient to support the gate operator and the dynamic forces  
created by the moving gate. LiftMaster recommends a pad 24” wide by 27” long by 30” deep.  
2. The operator must be level and parallel to the gate, so the pad should be level and about 4”  
above grade to prevent water entrance.  
3. Four anchor bolts are required to secure the gate operator to the pad. The mounting holes in  
the gate operator are 5/8” in diameter. Red Head bolts ½” x 3½“ are recommended.  
4. Be sure to provide access for wiring conduits. In Master/Slave systems, remember to include  
conduit stubs for separate inputs (if any) and for the Master/Slave connection cable between  
gate operators.  
NOTE: Shading indicates conduit stub access areas .  
INSTALLATION NOTES  
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C.  
POWER WIRING  
1. Provide a separate conduit stub for the AC power.  
2. Each gate operator requires a 115 VAC 20 AMP single phase circuit. NOTE: Master and  
Slave units each require separate circuits to prevent false overcurrent faults.  
3. Be sure to pull a ground wire in the conduit for the connection to the gate operator. Do not rely  
on metallic conduit for earth ground.  
D.  
LOOP DETECTORS  
1. The gate operator has a shelf that can support non-LiftMaster loop detector electronics.  
Power for the loop detector can come from the auxiliary 115 VAC plugs in the gate operator or  
from the 24 VAC provided by the gate operator control board.  
2. Conduit provisions should be made for the “loop” wire entrance to the loop detector.  
3. The shelf space provided is approximately 4” x 10” x 5” high. Shelf space on systems without  
the Power Fail Operation Option is about 10" x 10" x 5".  
NOTE: Optional LiftMaster-supplied loop detector add-on boards are available, both pre-installed  
and for installation in the field. See Part 4, SW 2000-B1 Options.  
E.  
OTHER CONNECTIONS  
Provisions should be made for conduit entrance into the gate operator for Master/Slave wiring and  
external activating devices such as key switches, telephone entry systems, etc.  
INSTALLATION NOTES  
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PART 2  
SYSTEM INSTALLATION  
A.  
MOUNTING GATE OPERATOR  
WARNING  
For safety reasons, the Power Fail Operation Option is shipped with the battery unconnnected  
to the system. Do not connect the battery until all other installation and alignment  
procedures have been completed. Failure to observe this warning may result in the Power  
Fail Operation Option moving the gate at unexpected moments.  
To avoid injury, always turn off the unit power switch before working on gate.  
1. Loosen the large mounting bolt and remove the Swing Arm Cap assembly.  
2. Remove 4 protective bolts holding the cover on, lift off the cover and set aside.  
3. Remove the assembly kit and parts.  
4. Remove the 4 bolts that attach the gate operator to the shipping pallet.  
5. Mount gate operator on the cement pad using the previously installed anchors. Be sure the  
operator mounting is level and square, and that the gate operator control box faces away  
from the gate.  
6. Connect the power conduit into the switch box.  
7. Reinstall the Swing Arm Cap assembly and finger tighten the large mounting bolt.  
B.  
CONNECTING POWER  
CAUTION  
Ensure that the AC power circuit breaker is turned off  
before wiring power to the switchbox.  
Run power cables through the conduit to Gate Operator,  
then connect wires to the switch box as shown in Figure 3:  
1. Wire nut the hot (black) wire to the black pig tail.  
2. Wire nut the neutral (white) wire to the white pig tail.  
3. Wire nut the ground (green) wire to the green pig tail.  
4. Dress all wiring inside the switch box and install cover.  
Figure 3. AC Wiring.  
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C.  
RUNNING INPUT WIRING  
1. Remove the plastic control box cover.  
2. Run wires from input components and Master/Slave conduits into control box.  
3. For Master/Slave wiring, refer to Part 3, Master/Slave Operation.  
WARNING  
Route but do not connect input wires at this time. If inputs are connected now, the gate operator  
may activate at random during installation, potentially injuring installation personnel.  
D.  
SETTING GATE OPEN DIRECTION SWITCHES S2 AND S3  
Figure 4. Gate Direction, Power Fail Option Switch Location.  
NOTE: For swing gate operation, controls are Right/Clockwise and Left/Counterclockwise.  
1. Gate opening direction is set by switch S2, located on the control board. The switch is sensed  
only on power up, so it should be set when the power is off.  
2. Ensuring power is off, set switch S2 to the left for a Right Gate, or to the right for a Left Gate.  
If the system was ordered with the Power Fail Operation option:  
3. The power failure gate opening direction is set by switch S3, located next to switch S2 on the  
control board. Set switch S3 left for clockwise or right for counterclockwise opening.  
E.  
POWER UP PROCEDURE  
1. Turn on circuit breaker that provides power to gate operator.  
2. On Manual Input Terminal TB2, connect the STOP terminal to the COMMON terminal (see  
Figure 5).  
3. Turn on gate operator power switch and verify that the row of LEDs on the right side of the  
controller board all turn on, then turn off sequentially, starting from the bottom. The only LEDs  
that should remain on are Power ON, MAGLOCK, and CLOSE LIMIT or OPEN LIMIT, if one of  
the limit switches are engaged.  
NOTE:  
If the LEDs do not follow this pattern, the controller board may not be working  
correctly. Stop installation and call LiftMaster Technical Support for assistance.  
4. On Manual Input Terminal TB2, disconnect the STOP terminal from the COMMON terminal.  
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F.  
USING MANUAL CONTROLS  
Figure 5. Manual Controls, Location and Use.  
Use the manual controls on Manual Input Terminal TB2 (OPEN, CLOSE, and STOP, as shown in  
Figure 5), to move the gate for arm installation and making the limit cam adjustments.  
•
•
•
To open the gate: connect the OPEN and STOP terminals to the COMMON terminal.  
To close the gate: connect the CLOSE and STOP terminals to the COMMON terminal.  
To stop the gate: disconnect the STOP terminal from the COMMON terminal.  
IMPORTANT NOTE  
If the STOP terminal is disconnected from the COMMON terminal, the gate is prevented  
from moving and no command will affect the gate.  
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G.  
GATE ARM INSTALLATION  
Figure 6. Gate Arm Installation.  
1. Attach gate anchor to gate by welding or using hardware (not supplied).  
2. Using manual controls, move the swing arm cap assembly until it points roughly to the  
anchor as shown in Figure 6.  
3. Measure and cut the swing arm to length. Attach swing arm to swing arm cap assembly  
with gate stop on driveway side, using supplied hardware or by welding.  
WARNING: Installing gate stop on the wrong side will cause damage to the gate operator.  
4. Measure and cut Drag Link pipe to length, then insert spherical rod end assembly into pipe  
and tighten locking nut.  
5. Attach welded end of Drag Link Assembly to Anchor and unwelded end to Swing Arm.  
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H.  
SETTING LIMIT CAMS  
•
•
•
The limit cams are adjusted by loosening the locking screws and rotating the cams. The cams  
rotate with the swing arm shaft, so small adjustments are magnified by the length of the gate.  
The gate operator torque limiter allows the gate to be pushed or pulled a short distance (a few  
inches) only. Use manual controls to move the gate during limit cam adjustment.  
To avoid damage to the gate and gate operator due to the gate overrunning its limits, perform  
the following steps carefully:  
1. SETTING RIGHT GATE LIMIT CAMS  
Figure 7. Setting Right Gate Limit Cam.  
1. Make sure that switch S2 is set to the "Left" position.  
2. Turn on gate operator power switch.  
3. Using manual CLOSE and STOP, move the gate to its proper closed limit position.  
4. Loosen the locking screw on the bottom limit cam and turn the cam clockwise until it just barely  
closes the limit switch.  
5. Retighten the limit cam locking screw.  
6. Using manual OPEN and STOP, move the gate to its proper open limit position.  
7. Loosen the locking screw on the top limit cam and turn the cam counterclockwise until it just  
barely closes the limit switch.  
8. Retighten the limit cam locking screw.  
9. Open and close the gate to check the limit cam settings. If required, readjust the limit cams  
until they are set properly.  
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2. SETTING LEFT GATE LIMIT CAMS  
Figure 8. Setting Left Gate Limit Cam.  
1. Make sure that switch S2 is set to the "Right" position.  
2. Turn on gate operator power switch.  
3. Using manual OPEN and STOP, move the gate to its proper open limit position.  
4. Loosen the locking screw on the bottom limit cam and turn the cam clockwise until it just barely  
closes the limit switch.  
5. Retighten the limit cam locking screw.  
6. Using manual CLOSE and STOP, move the gate to its proper closed limit position.  
7. Loosen the locking screw on the top limit cam and turn the cam counterclockwise until it just  
barely closes the limit switch.  
8. Retighten the limit cam locking screw.  
9. Open and close the gate to check the limit cam settings. If required, readjust the limit cams  
until they are set properly.  
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I.  
GATE SENSITIVITY ADJUSTMENTS  
The gate operator monitors both average and peak motor current. When the gate encounters an  
obstruction, the gate operator senses the change in motor current and stops or reverses the gate.  
Three sensitivity adjustments must be set in the field:  
•
•
•
Right gate motion (R78)  
Left gate motion (R81)  
Inrush current (R119)  
NOTES: The Overload adjustment (R71) is factory set. Do not adjust.  
Current flow varies with temperature. Do not tune the sensitivity measurements too  
finely, or they may change with the time of day or seasons.  
For swing gate operation, controls are Right/Clockwise and Left/Counterclockwise.  
♦ If your installation requires setting switch S2 the “Open to Right” position, use the “Open to  
Right" adjustment procedures below. If your installation requires setting S2 to the “Open to  
Left” position, use the “Open to Left" adjustments following the "Open to Right" procedures.  
♦ The minimum sensitivity is full clockwise and maximum sensitivity is full counter clockwise.  
These adjustments must be made while the gate is in motion.  
♦ Before starting the adjustments, verify that the Overload pot is set to 3:00 o'clock, the Left and  
Right reverse pots are set fully clockwise, and the Inrush pot is set to the 11 o’clock position  
(see Figure 9).  
♦ Make all adjustments in the order listed.  
Figure 9. Gate Sensitivity Adjustments Location.  
1. LEFT GATE (CLOCKWISE OPEN) ADJUSTMENTS  
"Right Reverse" Adjustment (R78)  
1. Initiate opening the gate.  
2. Wait 4 to 5 seconds, then lightly "tug"against the edge of the gate to simulate an obstacle.  
3. If the gate does not stop, reclose the gate and adjust the pot slightly counterclockwise.  
4. Repeat steps 1-3 until the gate stops when tugged and has the desired sensitivity.  
"Left Reverse" Adjustment (R81)  
1. Open the gate fully, then initiate closing the gate.  
2. Wait 4 to 5 seconds, then lightly "bump" the leading edge of the gate to simulate an obstacle.  
3. If the gate does not stop or back up, reopen the gate and adjust the pot slightly  
counterclockwise.  
4. Repeat steps 1-3 until the gate stops or backs up when bumped and has the desired sensitivity.  
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2. RIGHT GATE (COUNTERCLOCKWISE OPEN) ADJUSTMENTS  
"Left Reverse" Adjustment (R81)  
1. Initiate opening the gate.  
2. Wait 4 to 5 seconds, then lightly "tug"against the edge of the gate to simulate an obstacle.  
3. If the gate does not stop, reclose the gate and adjust the pot slightly counterclockwise.  
4. Repeat steps 1-3 until the gate stops when tugged and has the desired sensitivity.  
"Right Reverse" Adjustment (R78)  
1. Open the gate fully, then initiate closing the gate.  
2. Wait 4 to 5 seconds, then lightly "bump" the leading edge of the gate to simulate an obstacle.  
3. If the gate does not stop or back up, reopen the gate and adjust the pot slightly  
counterclockwise.  
4. Repeat steps 1-3 until the gate stops or backs up when bumped and has the desired  
sensitivity.  
3. INRUSH CURRENT ADJUSTMENT (R119)  
1. Turn the pot fully counterclockwise.  
2. Initiate opening the gate.  
3. If the gate stops due to a fault condition, slightly adjust the pot clockwise.  
4. Repeat steps 2 and 3 until the gate cycles without a fault.  
5. Open the gate fully, then initiate closing the gate.  
6. If the gate stops or backs up due to a fault condition, slightly adjust the pot clockwise.  
7. Repeat steps 6 and 7 until the gate cycles without a fault and has the desired sensitivity.  
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J.  
SETTING GATE CONTROL SWITCH S1 AND RECLOSE TIMER POT R94  
NOTE: For complete details on controls, indicators adjustments and inputs, see Appendix A.  
1. GATE CONTROL SWITCH (S1)  
Figure 10. Gate Control Switch S1 Location.  
SLIDE ACTION When used with ATG, this switch controls several gate operator features:  
(S1-1)  
Inside Interrupt Loop: four different modes are selectable:  
SLIDE and ATG OFF: Loop activation prevents the gate from opening or closing. If  
gate is moving, Loop activation stops the gate. When the Loop clears, the gate  
resumes its course.  
SLIDE only ON: Loop activation prevents the gate from closing. If gate is closing, Loop  
activation opens the gate and starts the Reclose Timer, if timer is on.  
ATG only ON: Loop activation prevents the gate from opening or closing. If gate is  
closing, a Loop activation stops the gate. When the Loop clears, the gate resumes  
closing. If the gate is opening or fully open, as soon as the Loop clears, the gate  
immediately begins closing to discourage tailgaters.  
SLIDE and ATG ON: Loop activation prevents the gate from closing. When the Loop  
clears, the gate resumes closing. If gate is opening or fully open, as soon as the  
Loop clears, the gate immediately begins closing to discourage tailgaters.  
Dynamic Braking: When SLIDE is ON, gate brakes whenever it stops.  
When SLIDE is OFF, gate brakes only at open or close limit.  
TIMER  
(S1-2)  
Sets the Reclose Timer to OFF (left) or ON (right). When enabled, the timer controls  
how long the gate waits at the open limit before closing. The Reclose Timer can be  
set from 0-250 seconds by adjusting the Reclose Timer pot (R94). During a power  
outage, if the gate is fully open and TIMER is ON, the Reclose Timer starts after the  
restoration of power, causing the fully open gate to close automatically.  
RETRY  
(S1-3)  
Sets the Retry function to OFF (left) or ON (right). When enabled, if the gate meets  
an obstacle, a closing gate reverses and an opening gate stops, waits 30 seconds,  
then tries to resume. The gate will re-try twice before it faults out.  
ATG  
(S1-4)  
Sets Anti-Tailgate function to OFF (left) or ON (right). The Anti-Tailgate feature helps  
prevent two cars from entering on one OPEN command.  
MASTER  
(S1-5)  
In conjunction with the TRAP switch, sets configuration for master/slave system.  
TRAP  
(S1-6)  
In conjunction with the MASTER switch, sets configuration for master/slave system.  
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2. RECLOSE TIMER ENABLE (S1) AND SET (R94)  
Figure 11. Reclose Timer Enable and Adjustmment Location.  
The Reclose Timer pot (R94) is adjustable from 0 to 250 seconds. Turning the pot clockwise  
increases the reclose time. NOTE: Pot in figure is set to 0 seconds.  
1. To enable the Timer, set switch S1-2 (TIMER) to the ON (right) position.  
2. Turn the pot fully counterclockwise.  
3. Open the gate. Gate should close almost immediately when it reaches the open limit.  
4. Adjust the pot slightly clockwise.  
5. Open the gate. Note the delay between the gate reaching the open limit and starting to  
close.  
6. Repeat steps 4 and 5 until the desired relcose time is set.  
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K.  
POWER FAIL OPERATION OPTION CONNECTION  
a)  
Power Fail Operation Option Connection  
CAUTION  
Perform the next step (battery hookup) with care. Interchanging battery wires temporarily  
opens the the resettabale fuse on gate operator board, disabling the power fail option.  
To ensure a safe installation, the gate operator is shipped with the battery partially  
disconnected from the Power Fail Option electronics. To enable this option:  
•
Connect white/red wire of option harness to positive (+) battery terminal.  
b)  
Power Fail Operation Option Test  
NOTES:  
•
•
The following procedures require turning main power to the gate operator off and on at its  
dedicated circuit breaker. DO NOT shut off the Gate Operator Power switch unless  
specifically directed by the procedure, since this will shut off everything, including the  
Power Fail Operation option.  
Because the battery may not be fully charged at the time of the test, we strongly suggest  
moving the gate only one foot when performing the power fail test.  
1. Set Power Fail switch S3 to the same position as switch S2 (Figure 4).  
2. Turn on gate operator power switch.  
3. Using the manual controls (Figure 5), initiate gate opening, then stop the gate about one  
foot short of its fully open position.  
4. Turn off main power to the gate operator. After about one minute the gate should start  
opening and stop at its fully open limit.  
5. Turn on main power to the gate operator.  
6. Set Power Fail switch S3 to the opposite position.  
7. Using the manual controls, initiate gate closing, then stop the gate about one foot short of  
its fully closed position.  
8. Turn off main power to the gate operator. After about one minute the gate should start  
closing and stop at its fully closed limit.  
9. Turn on main power to the gate operator.  
10. Set Power Fail switch S3 to the direction you desire the gate to move after a power outage.  
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L.  
CONNECTING INPUT WIRING  
Figure 12. Control Board Wiring.  
1. Remove the plastic control box cover. See NOTES, next page, before proceeding.  
2. Wire all external control devices to their connections on the control board as shown.  
See Appendix A for details on how each control input affects the gate operator.  
3. Connect the Master/Slave interconnect cable (see Part 3).  
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NOTES  
1. Disconnecting the STOP terminal from the COMMON terminal stops the gate and prevents  
all commands from having any effect.  
2. Inside and Outside Interrupt Loops:  
•
•
•
For safety and proper gate operation, gate(s) must open toward the Inside Interrupt loop.  
For maximum safety, Inside and Outside Interrupt loops require separate loop detectors.  
If only one loop detector is used, the Outside loop must also be connected to the Inside loop  
detector.  
•
In Bi-Parting and Bi-Parting Latch Master/Slave systems, to enhance system safety,  
Interrupt loops, Shadow loops and Interrupt Bar switches may be connected to both gates.  
If this is done, when connecting the two control boards, do not interchange input and  
common terminals. If terminals are interchanged, inputs will not be detected and  
controller boards may be damaged.  
M.  
POST INSTALLATION PROCEDURES  
1. Setup  
1. Turn on the main power at the gate operator's circuit breaker.  
2. Verify that switch S2 (the Gate Open Direction switch) is set to the correct position.  
3. Turn on the unit power switch (on master/slave systems, turn on slave and then master).  
2. Manual inputs  
1. Verify that Manual Open fully opens the gate and that the open limit switch stops the gate.  
2. Verify that Manual Close fully closes the gate and that the close limit switch stops the gate.  
3. Verify that Manual Stop stops the gate.  
Note: If the gate stops due to a Reverse Fault, readjust the gate sensitivity pot.  
3. Mechanical  
Use the Manual Input commands to verify that:  
1. The gate swings open and closed smoothly.  
2. There is no squeak or vibration in the gate when it is moving .  
3. There is no belt and torque limiter slippage when the gate moves or stops.  
4. There is no slack in the closed gate due to loose chain or parts.  
5. Both gates open and close at the same time (Bi-Parting gates only).  
4. Gate sensitivity  
1. Left/Right Reverse sensitivity:  
Apply a bump to the opening and closing gate and verify that the gate stops or reverses.  
2. Inrush (Gate response time) :  
Apply a bump to the gate as it initiates opening and closing and verify that the gate  
responds to the bump within a second.  
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5. Maximum Retry Count  
1. If you want the gate to resume operation automatically up to 2 times, 30 seconds after a  
Fault, set RETRY on switch S1 to ON.  
2. If you do not want the gate to resume automatically after a Fault, set RETRY on switch S1  
to OFF.  
3. Give the opening gate a quick bump to generate a fault and verify retry operation.  
6. Entry inputs  
1. Activate the CYCLE input (entry system), RADIO input (radio transmitter), and EXIT Loop  
input (driving over the exit loop) and verify that they fully open the gate. If Reclose Timer is  
ON, it will close the gate.  
2. Activate the FIRE input (fire department switch) and verify that the gate fully opens and then  
closes immediately. If Reclose Timer is ON, it will close the gate.  
7. Alternate Action  
1. If you want the CYCLE input (Entry system) or RADIO input (Transmitter) to both open and  
close the gate, on switch S1 set TIMER to OFF and ATG to OFF.  
2. Activate the CYCLE command, wait until the gate is fully open, then activate the CYCLE  
command again. The gate should close, verifying Alternate Action operation.  
Note: If you select Alternate Action, you cannot use ATG = ON and TIMER = ON in  
procedures 8 and 9 that follow.  
8. Reclose Timer  
1. If you want a fully open gate to automatically close after a period of time, on switch S1, set  
TIMER to ON and adjust Reclose Timer pot R94 to set the time period.  
2. If you don't want the gate to close automatically, on switch S1, set TIMER to OFF.  
3. Activate any entry command (except Manual OPEN) to open the gate and verify the  
Reclose Timer operation.  
NOTE: Reclose Timer is not functional when the Manual Open command is used.  
9. Inside Interrupt Loop and ATG (when exiting)  
1. If you want the gate to stop when a vehicle drives onto the Interrupt Loop and to restart  
when the vehicle drives off the Interrupt Loop, on switch S1, set SLIDE and ATG to OFF.  
2. If you want the gate to stop when a vehicle drives onto the Interrupt Loop and to close when  
the vehicle drives off the Interrupt Loop, on switch S1, set SLIDE to OFF and ATG to ON.  
3. If you want a closing gate to open when a vehicle drives on the Interrupt Loop, on switch  
S1, set SLIDE to ON and ATG to OFF.  
4. If you want a closing gate to stop when a vehicle drives on the Interrupt Loop and an  
opening or closing gate to close when the vehicle drives off the Interrupt Loop, on switch  
S1, set SLIDE and ATG to ON.  
5. Activate the CYCLE command, drive over the Interrupt Loop, and verify its operation.  
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10. Shadow Loop  
1. Ensure the gate is fully closed (the close limit switch and Maglock LED’s will be ON).  
2. Park a car, while it is running, on the Shadow Loop but clear of the Interrupt Loop.  
3. Activate an open command and verify that the gate does not open  
CAUTION: If the gate begins to open, move the car immediately.  
4. Remove the car from the Shadow Loop and verify that an open command opens the gate.  
NOTE: In a Bi-Parting Master/Slave system, BOTH gates must be at either the fully open or  
fully closed limit for the Shadow loop input to be effective.  
11. Interrupt Bar  
While the gate is opening , push on the Interrupt Bar. The gate should stop.  
12. Maglock  
Verify that the maglock activates when the gate is fully closed.  
13. Automatic Gate Closure  
1. To automatically close a fully open gate after power is restored, on switch S1, set TIMER to  
ON.  
2.  
Open the gate fully, then cycle the unit power switch to verify Automatic Gate Closure  
operation.  
14. Power Fail Option  
3. Verify that switch S3 (Power Fail Open Direction switch) is set to the desired position  
(Figure 4).  
4. Record switch S3 setting in the space provided in the Maintenance Section.  
It is essential that maintenance personnel know what the gate will do when power is  
turned off during maintenance.  
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N.  
FINAL ASSEMBLY OF GATE OPERATOR  
Figure 13. Gate Operator Final Assembly.  
IMPORTANT SAFETY PROCEDURE  
⇒ If switch S3 (Power Fail Open Direction switch) is set to OPEN the gate, cycle the gate to its  
fully open position before performing step 1.  
⇒ If switch S3 (Power Fail Open Direction switch) is set to CLOSE the gate, cycle the gate to its  
fully closed position before performing step 1.  
1. Turn off power to the gate operator at the circuit breaker and wait for one minute.  
2. Disconnect Drag Link from Anchor, then loosen mounting bolt and remove Swing Arm Cap  
Assembly and Drag Link Assembly from drive shaft. Set this assembly aside.  
3. Install clear cover on gate operator control box.  
4. Make sure that gate operator unit power switch is turned on.  
5. Install gate operator cover and secure with four bolts.  
6. Replace Swing Arm Cap Assembly and Drag Link Assembly on drive shaft, then reconnect  
Drag Link to gate Anchor.  
7. Tighten mounting bolt on Swing Arm Cap Assembly into the countersunk hole in the drive  
shaft, then tighten the locking nut.  
8. Turn on power to the gate operator at the circuit breaker.  
9. Cycle the gate to ensure it is operating properly.  
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PART 3  
MASTER/SLAVE OPERATION  
A.  
WHAT IS MASTER/SLAVE OPERATION?  
The easy way to understand master/slave operation is by the computer terms "smart" and "dumb."  
•
•
"Smart" machines are controlled by a computer or dedicated microprocessor, such as microwave  
ovens and new-style washing machines.  
"Dumb" machines are controlled by simple electronic or physical mechanisms, like old-style  
washing machines with their cams and timers.  
When your installation requires using two gates together, they can be controlled either by the "dumb"  
method of wiring them in parallel and using limit cams and reclose timers for control (see Appendix B),  
or the "smart" method of enabling the Master/Slave programming built into the gate operators.  
LiftMaster gate operators are capable of handling any gate combination you're likely to need, and we  
strongly recommend using the "smart" method for the following reasons:  
1. Synchronization: Gate actions (opening, closing, etc.) are synchronized in Master/Slave  
operation.  
2. Added safety: A fault in one unit affects both units, providing added safety to the system.  
3. Reduced wiring: Inputs (radio, exit loops, etc.) need be wired to only one unit in some Master/  
Slave configurations.  
4. Simplified gate setting: Gate controls (ATG, Reclose Timer, etc.) only need to be set in one unit  
in some Master/Slave configurations.  
Let's take a quick look at some Master/Slave gate configurations, cover the wiring and setup  
procedures, then go into the details of each type to help plan your installation.  
B.  
MASTER/SLAVE GATE CONFIGURATIONS  
LiftMaster models SL 1000-B1 (slide gate), SW 2000-B1 (swing gate) and BG 3000-B1 (barrier gate)  
can be teamed as Master/Slave systems in the following configurations:  
Figure 14. Master/Slave Gate Configurations.  
•
•
In the Master/Slave configuration, one Master unit controls one Slave unit.  
Master and Slave units communicate at 9600 baud via a 4-wire interconnection cable.  
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C.  
MASTER/SLAVE WIRING  
Connecting Master and Slave units is fast and easy:  
•
•
•
•
•
Master/Slave connections are made through the SLAVE I/O terminal block (TB1), located at  
the top right corner of the gate operator controller board (see Figure 15, below).  
Connect the Receive inputs (RECV1, RECV2) on each board to the Transmit inputs (XMIT1,  
XMIT2) on the other board.  
To prevent cross-talk between Master/Slave wires and power or input wires, use shielded  
cable or run the Master/Slave wires in a separate conduit.  
Use two 18-14 AWG twisted pair wires or a shielded cable containing 2 twisted pair wires for  
Master/Slave Interconnection.  
To ensure a reliable communication between Master and Slave units, the maximum allowable  
wire length is 3000 feet.  
NOTE  
Be sure to connect the two units correctly. Improper wiring of the Master/Slave inter-  
connection prevents proper operation of the system.  
Figure 15. Master/Slave Connection and Switch S1 Location.  
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D.  
MASTER/SLAVE SETUP PROCEDURE  
1. Be sure to turn off both gate operator units.  
2. Connect Master and Slave units as described and shown in paragraph C and Figure 15, above.  
3. Set Switch S1 on Master and Slave units to your gate configuration according to the table, below.  
NOTES  
•
•
If, before power up, the Master/Slave connection is broken, one of the units is turned off, or one of  
the controller boards malfunctions, the gates will operate in stand alone configuration.  
If the Master/Slave connection is broken after power up, it prevents either gate from moving.  
MASTER UNIT SWITCH S1 SETTINGS AND INPUTS  
SLIDE  
ACTION  
(Reclose)  
TIMER  
Gate  
Type  
Operator  
Inputs  
RETRY  
ATG  
MASTER  
TRAP  
Unit  
Optionš  
System  
Optionn  
System  
Optionn  
System  
Optionn  
Bi-Parting  
ON  
ON  
ON  
ON  
ON  
OFF  
ON  
Systemp  
Systemp  
Unit™  
Bi-Parting  
Latch  
Unit  
Optionš  
System  
Optionn  
System  
Optionn  
System  
Optionn  
Unit  
Optiono  
Unit  
Optiono  
Unit  
Optiono  
Trap  
ON  
Unit  
Optiono  
Unit  
Optiono  
Unit  
Optiono  
Tandem  
OFF  
ON  
Unit™  
n: Select ATG, Timer and/or Retry (if desired) from the Master unit and set Slave ATG, Timer and Retry to OFF.  
Otherwise, the ATG ON/shorter Reclose Timer/Retry ON in either unit supersedes the other.  
o: Master and Slave units can have different settings.  
p: Inputs affect both gate operators, so connect to one unit only.  
™: Inputs affect one gate operator only, so connect inputs separately to each gate operator.  
š: For safe and reliable operation, this setting MUST be the same for both units (see Appendix A).  
SLAVE UNIT SWITCH S1 SETTINGS AND INPUTS  
SLIDE  
ACTION  
(Reclose)  
TIMER  
Gate  
Type  
Operator  
Inputs  
RETRY  
ATG  
MASTER  
TRAP  
Unit  
Optionš  
System  
Optionn  
System  
Optionn  
System  
Optionn  
Bi-Parting  
ON  
OFF  
OFF  
OFF  
OFF  
Systemp  
Systemp  
Unit™  
Bi-Parting  
Latch  
Unit  
Optionš  
System  
Optionn  
System  
Optionn  
System  
Optionn  
OFF  
OFF  
OFF  
Unit  
Optiono  
Unit  
Optiono  
Unit  
Optiono  
Trap  
No Effect  
Unit  
Optiono  
Unit  
Optiono  
Unit  
Optiono  
Unit  
Option  
Tandem  
Unit™  
n: Select ATG, Timer and/or Retry (if desired) from the Master unit and set Slave ATG, Timer and Retry to OFF.  
Otherwise, the ATG ON/shorter Reclose Timer/Retry ON in either unit supersedes the other.  
o: Master and Slave units can have different settings.  
p: Inputs affect both gate operators, so connect to one unit only.  
™: Inputs affect one gate operator only, so connect inputs separately to each gate operator.  
š: For safe and reliable operation, this setting MUST be the same for both units (see Appendix A).  
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E.  
MASTER/SLAVE INSTALLATION DETAILS  
1. BI-PARTING GATE DETAILS  
The simple Bi-Parting Gate is typically used in low traffic residential sites due to its ease of use. The  
Bi-Parting configuration can consist of any combination of models SL 1000-B1 (slide gate), SW 2000-  
B1 (swing gate) and BG 3000-B1 (barrier gate).  
INPUTS:  
COMPLEX  
Radio  
SWITCH S1  
SETTINGS:  
Slide:Unit  
Option  
Cycle  
Interrupt Bar  
Interrupt Loop  
Shadow Loop  
Fire  
SWITCH S1  
SETTINGS:  
Slide: Unit  
Option  
Timer: OFF  
Retry: OFF  
ATG: OFF  
Master: ON  
Trap: OFF  
Timer: Sys.  
Option  
Exit Loop  
MagLock  
Retry: Sys.  
Option  
Manual Inputs  
Inside Interrupt  
Loop  
ATG: Sys.  
Option  
Gate  
Operator  
Master  
Gate  
Operator  
Slave  
Master: ON  
Trap: ON  
Shadow Loop  
(swing gates only)  
Master/Slave Cable  
Slave Gate  
Fence  
Master Gate  
Fence  
For safety, setting MUST  
be the same for both units.  
Connect MagLock to one unit only.  
Outside Interrupt  
Loop  
STREET  
1204F20  
Figure 16. Typical Bi-Parting Gate Installation  
HOW IT WORKS:  
•
•
•
The gates in a Bi-Parting configuration are mirror images of each another and act identically.  
A fault in one unit affects both units (see Troubleshooting/Maintenance for Fault List).  
A continuous FIRE input in either gate opens the gates and holds them open.  
There are 3 different ways to close the gates (entering or exiting):  
1. Reclose Timer: When the Reclose Timer expires, gates close automatically.  
2. ATG and Interrupt Loop: With ATG ON, clearing the Inside Interrupt Loop closes the gates.  
3. Alternate Action: With ATG and TIMER OFF, RADIO or CYCLE commands will close fully-opened gates.  
INPUT CONNECTIONS: (for more details, refer to paragraph L, Connecting Input Wiring)  
•
Inputs can be connected to either gate, but do not need to be connected to both. However, for  
enhanced safety, the Interrupt Bar, Interrupt Loop, and Shadow Loop inputs may be connected to both  
gates.  
MASTER UNIT SWITCH S1 SETTINGS AND INPUTS  
SLIDE  
ACTION  
(Reclose)  
TIMER  
Gate  
Type  
Operator  
Inputs  
RETRY  
ATG  
MASTER  
TRAP  
ON  
Unit  
Optiono  
System  
Optionn  
System  
Optionn  
System  
Optionn  
Bi-Parting  
ON  
Systemp  
SLAVE UNIT SWITCH S1 SETTINGS AND INPUTS  
Unit  
Optiono  
System  
Optionn  
System  
Optionn  
System  
Optionn  
Bi-Parting  
ON  
OFF  
Systemp  
n: Select ATG, Timer and/or Retry from the Master unit and set Slave ATG, Timer and Retry to OFF. Otherwise, the  
ATG ON/shorter Reclose Timer/Retry ON in either unit supersedes the other.  
o: For safe and reliable operation, this setting MUST be the same for both units (see Appendix A).  
p: Inputs affect both gate operators, so you may connect inputs to either unit.  
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2. BI-PARTING LATCH GATE DETAILS  
The Bi-Parting Latch Gate is typically used in low traffic residential sites due to its ease of use and  
added security of magnetic locking. The Bi-Parting Latch configuration can consist of any combination  
of models SL 1000-B1 (slide gate), SW 2000-B1 (swing gate) and BG 3000-B1 (barrier gate).  
SWITCH S1  
INPUTS:  
SETTINGS:  
Radio  
COMPLEX  
Slide: Unit  
Cycle  
Option  
Timer: Sys.  
Option  
SWITCH S1  
SETTINGS:  
Slide: Unit  
Option  
Interrupt Bar  
Fire  
Exit Loop  
MagLock  
Manual  
Inputs  
Retry: Sys.  
Option  
Timer: OFF  
Retry: OFF  
ATG: OFF  
Master: OFF  
Trap: OFF  
Inside Interrupt  
Loop  
ATG: Sys.  
Option  
Master: ON  
Trap: OFF  
Gate  
Operator  
Master  
Gate  
Operator  
Slave  
Shadow Loop  
Master/Slave Cable  
Fence  
Fence  
For safety, setting MUST  
be the same for both units.  
Connect MagLock to one unit only.  
Outside Interrupt  
Loop  
STREET  
1204F21  
Figure 17. Typical Bi-Parting Latch Gate Installation  
HOW IT WORKS:  
•
The Master moves first during opening and Slave first during closing, with a 2 second delay  
between them to prevent gate intercollision and to ensure proper latching. When the gates are fully  
closed, the outer edge of the Master gate rests on the outer edge of the Slave.  
•
•
A fault in one unit affects both units (see Troubleshooting/Maintenance for Fault List).  
A continuous FIRE input in either gate opens the gates and holds them open.  
There are 3 different ways to close the gates (entering or exiting):  
1. Reclose Timer: When the Reclose Timer expires, gates close automatically.  
2. ATG and Interrupt Loop: With ATG ON, clearing the Inside Interrupt Loop closes the gates.  
3. Alternate Action: With ATG and TIMER OFF, RADIO or CYCLE commands close fully open gates.  
WARNING: The Power Fail Operation Option can be used ONLY on the Master Unit. To maintain all  
gate functions during power outages, use a full UPS (Uninterruptable Power Supply) on each unit.  
INPUT CONNECTIONS: (for more details, refer to paragraph L, Connecting Input Wiring)  
•
Inputs can be connected to either gate. For enhanced safety, the Interrupt Bar, Interrupt Loop, and  
Shadow Loop inputs may be connected to both gates.  
MASTER UNIT SWITCH S1 SETTINGS AND INPUTS  
SLIDE  
ACTION  
(Reclose)  
TIMER  
Gate  
Type  
Operator  
Inputs  
RETRY  
ATG  
MASTER  
TRAP  
OFF  
Bi-Parting  
Latch  
Unit  
Optiono  
System  
Optionn  
System  
Optionn  
System  
Optionn  
ON  
Systemp  
SLAVE UNIT SWITCH S1 SETTINGS AND INPUTS  
Bi-Parting  
Latch  
Unit  
Optiono  
System  
Optionn  
System  
Optionn  
System  
Optionn  
OFF  
OFF  
Systemp  
n: Select ATG, Timer and/or Retry from the Master unit and set Slave ATG, Timer and Retry to OFF. Otherwise, the  
ATG ON/shorter Reclose Timer/Retry ON in either unit supersedes the other.  
o: For safe and reliable operation, this setting MUST be the same for both units (see Appendix A).  
p: Inputs to one unit affect both gate operators, so you can connect inputs to either unit.  
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3. TRAP GATE DETAILS  
The Trap gate is typically used in secured sites for screening incoming and/or outgoing traffic. In the  
Trap configuration, only one gate opens at a time, "trapping" the vehicle between gates. Due to its  
ease of use, Slide gates are most popular for the Trap configuration. The Trap configuration can  
consist of any LiftMaster model for Master, and a model SL 1000-B1 (slide gate) or BG 3000-B1  
(barrier gate) for Slave. NOTE: The SW 2000-B1 (swing gate) may not be used for Slave.  
MASTER  
INPUTS:  
Radio  
SWITCH S1  
SETTINGS:  
Slide: Unit  
Option  
COMPLEX  
Cycle  
Interrupt Bar  
Fire  
MagLock  
Manual  
Inputs  
Timer: Unit  
Option  
Retry: Unit  
Option  
ATG: ON  
Master: ON  
Trap: ON  
Inside Interrupt  
Loop  
Gate  
Operator  
Master  
Shadow Loop  
(swing gate only)  
Master/  
Slave  
Cable  
Outside Interrupt  
Loop  
SWITCH S1  
SETTINGS:  
Slide: Unit  
Option  
SLAVE  
INPUTS:  
Radio  
Cycle  
Timer: Unit  
Option  
Interrupt Bar  
Fire  
MagLock  
Manual  
Inputs  
Retry: Unit  
Option  
ATG: OFF  
Master: OFF  
Trap: OFF  
Inside Interrupt  
Loop  
Gate  
Operator  
Slave  
Outside Interrupt  
Loop  
: Affects both units.  
STREET  
1204F22  
Figure 18. Typical Trap Gate Installation.  
HOW IT WORKS:  
•
In normal operation, one gate must completely close before the other opens, so only one gate is  
open at a time. As soon as one gate closes, the second gate automatically opens. If the second  
gate does not open within 10 seconds, the first gate reopens to let the vehicle exit the trap area.  
•
ATG (Anti-TailGating) is always active for both Master and Slave gates. Each gate closes as soon  
as its Inside Interrupt loop clears.  
•
•
•
Faults and Manual Input Commands in one unit affect both units.  
A continuous FIRE or Manual OPEN input in either gate opens the gates and holds them open.  
If a vehicle stalls between the gates and they close, they can be opened by a CYCLE or RADIO  
command, or by driving over: the Master unit Outside Interrupt Loop, the Slave unit Inside Interrupt  
Loop (SLIDE=ON only), or the (optional) Exit Loop.  
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There are 2 different ways to close the gate (entering or exiting):  
1. Reclose Timer: When the Reclose Timer expires, gate closes automatically (Master or Slave).  
2. Interrupt Loop; clearing the Inside Interrupt Loops cause the gates to close (Master or Slave).  
NOTE: To ensure gate closure, set Reclose Timer =ON in both Master and Slave  
INPUT CONNECTIONS: (for more details, refer to Part 2, Paragraph L, Connecting Input Wiring)  
•
•
Master and Slave units require their own separate inputs.  
If Radio inputs are used in both units, each requires its own transmitter and entry code.  
MASTER UNIT SWITCH S1 SETTINGS AND INPUTS  
SLIDE  
ACTION  
(Reclose)  
TIMER  
Gate  
Type  
Operator  
Inputs  
RETRY  
ATG  
MASTER  
TRAP  
ON  
Unit  
Optionn  
Unit  
Optionn  
Unit  
Optionn  
Trap  
ON  
ON  
Unito  
SLAVE UNIT SWITCH S1 SETTINGS AND INPUTS  
Unit  
Optionn  
Unit  
Optionn  
Unit  
Optionn  
Trap  
No Effect  
OFF  
OFF  
Unito  
n: Master and Slave units can have different Reclose Timer settings.  
o: Inputs affect one gate operator only, so connect inputs separately to each gate operator.  
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4. TANDEM GATE DETAILS  
The Tandem gate is typically used in high traffic situations where some control of incoming and/or  
outgoing traffic is required. The outside gate is usually a less expensive, fast moving barrier gate (or  
light slide gate) which protects the more expensive and less mobile Slide or Swing inside gate. The  
outside gate does this by stopping the vehicle until the inside gate is completely open. The Tandem  
configuration can consist of any LiftMaster model for Master, and a model SL 1000-B1 (slide gate) or  
BG 3000-B1 (barrier gate) for Slave. NOTE: The SW 2000-B1 (swing gate) may not be used for  
Slave.  
MASTER  
INPUTS:  
Radio  
SWITCH S1  
SETTINGS:  
Slide: Unit  
Option  
COMPLEX  
Cycle  
Interrupt Bar  
Fire  
MagLock  
Manual  
Inputs  
Timer: Unit  
Option  
Exit Loop  
Retry: Unit  
Option  
ATG: OFF  
Master: ON  
Trap: ON  
Inside Interrupt  
Loop  
Gate  
Operator  
Master  
Shadow Loop  
(swing gate only)  
Master/  
Slave  
Cable  
Outside Interrupt  
Loop  
SLAVE  
INPUTS:  
Radio  
SWITCH S1  
SETTINGS:  
Slide: Unit  
Option  
Cycle  
Interrupt Bar  
Fire  
MagLock  
Manual  
Inputs  
Timer: Unit  
Option  
Retry: Unit  
Option  
ATG: Unit  
Option  
Master: OFF  
Trap: OFF  
Inside Interrupt  
Loop  
Gate  
Operator  
Slave  
Outside Interrupt  
Loop  
: Affects both units.  
STREET  
1204F23  
Figure 19. Typical Tandem Gate Installation.  
HOW IT WORKS:  
•
When a vehicle is entering or exiting, the inside Master gate opens first. When the Master is  
completely open, the outside Slave gate opens, allowing the vehicle to enter or exit.  
•
The Master unit Reclose Timer (if enabled) does not start counting down until the Slave unit is fully  
closed. Since ATG is not allowed in the Master unit, if the Reclose Timer is not enabled, the  
Master gate will remain open.  
•
•
During high traffic hours, the slower-moving Master gate can be latched open by a continuous  
Manual Open input, leaving the faster moving Slave gate to control entering and exiting traffic.  
If a vehicle stalls between the gates and they close, they can be opened by a CYCLE or RADIO  
command, or by driving over: the Slave unit Inside Interrupt Loop (SLIDE=ON only), or (optional)  
Exit Loop.  
•
A fault in one unit affects both units (see Troubleshooting/Maintenance for Fault List).  
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•
•
A continuous FIRE input in either gate opens both gates and holds them open.  
A continuous Manual STOP in either gate stops both gates.  
There are 2 different ways to close the gate after entering or exiting:  
1. Reclose Timer: When the Reclose Timer expires, the gates close automatically (Master or Slave).  
2. ATG and Interrupt Loop: When ATG is ON, clearing the Inside Interrupt Loop causes the gate to  
close (Slave unit only).  
INPUT CONNECTIONS: (for more details, refer to Part 2, Paragraph L, Connecting Input Wiring)  
MASTER UNIT SWITCH S1 SETTINGS AND INPUTS  
SLIDE  
ACTION  
(Reclose)  
TIMER  
Gate  
Type  
Operator  
Inputs  
RETRY  
ATG  
MASTER  
TRAP  
ON  
Unit  
Optionn  
Unit  
Optionn  
Unit  
Optionn  
o
Tandem  
OFF  
ON  
SLAVE UNIT SWITCH S1 SETTINGS AND INPUTS  
Unit  
Optionn  
Unit  
Optionn  
Unit  
Optionn  
Unit  
Option  
o
Tandem  
OFF  
OFF  
n: Master and Slave units can have different settings.  
o: Exit, Radio, Cycle, Fire, and Manual Stop inputs affect both gate operators, so connect inputs to one unit only.  
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PART 4  
MODEL SW 2000-B1 OPTIONS  
A.  
B.  
LIFTMASTER LOOP DETECTOR BOARDS  
The model SW 2000-B1 has connectors for four LiftMaster-supplied loop detector add-on boards.  
These boards interface with Interrupt, Shadow and Exit loop sensors, which simply plug into the control  
board. The add-on boards can be ordered pre-installed, or can be installed in existing model SW  
2000-B1 units.  
POWER FAIL OPERATION OPTION  
The LiftMaster Power Fail Operation Option may be ordered pre-installed in new units, or can be  
purchased separately for installation in LiftMaster gate operator systems in the field. The Power Fail kit  
includes a DC motor, belt, battery, battery support bracket assembly (includes bracket, 3 control relays,  
rectifier and wire harness) and mounting hardware. Features of the Power Fail Option are as follows:  
•
The Power Fail Operation system fully opens or closes the the gate (User's choice) one minute  
after a power outage. The gate will remain open or closed until AC power is restored.  
•
When AC power is restored, the battery is charged up to its full potenial, then continuously trickle  
charged. Recharging takes from one to five hours, depending on the weight of the gate and how  
far it moved during the outage. The age of the battery also increases the battery charging time.  
NOTE: Battery capacity decreases over time. Battery should be replaced every two or three years.  
•
•
The charging section and controls for the Power Fail Operation are located on the control board.  
The motor sensing potentiometers (Right reverse, Left reverse, and Inrush) on the Gate Operator  
board may require readjustment if the Power Fail Operation option is installed in the field.  
•
Gate speed may be slightly reduced with the Power Fail Operation option installed.  
IMPORTANT NOTE  
During a power outage, all Gate Operator safety features are  
disabled and only the limit switches stop movement of the gate.  
C.  
GATE OPERATOR COVER WITH ACCESS DOOR  
This optional cover allows access to the gate operator control board without first having to remove the  
gate arm and operator cover. Just unlock the door (a standard LiftMaster lock), gently tip the top of the  
door, then lift and remove the door.  
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PART 5  
TROUBLESHOOTING AND MAINTENANCE  
A.  
TROUBLESHOOTING  
This section is designed to help you troubleshoot your unit(s) with a minimum of effort. Directly below  
are some hints to help you test, then a list of problems in order of most severe to least. Next comes a  
quick-reference list of faults and how to clear them, and then a list of faults and their causes.  
Testing Control Board inputs: To test an input, connect the input terminal to the COMMON  
terminal on the Control Board and verify that its LED turns on momentarily. Normally, the Close  
limit switch and Maglock LED's are on if the gate is fully closed, and Open limit switch and  
Reclose Timer LED's are on if the gate is fully open. The Power ON and Manual STOP LED's  
are always on.  
Low input AC voltage: The voltage across connector J3 pins 1 (red wire) and 3 (white wire)  
on the Control Board must measure 100VAC to 130VAC.  
CAUTION HIGH VOLTAGE. Measure with care.  
Fault Causes: Refer to the end of troubleshooting section.  
1. OPERATOR IS DEAD  
When the unit power switch is cycled, no LED turns on.  
1. The main circuit breaker is off.  
2. The unit power switch is off.  
3. The input power connector is not connected securely to the Control Board.  
4. Low input AC voltage.  
5. Bad Control Board.  
2. OPERATOR DOES NOT RUN  
When the unit power switch is cycled, LED's blink simultaneously or turn on randomly:  
1. Low input AC voltage.  
2. The processor was installed improperly into Control Board by the installer.  
3. Bad Control Board.  
When the unit power switch is cycled, all LED's turn on and off (except Power On) at the  
same time:  
1. On Manual Input Terminal TB2, the STOP terminals disconnected from the COMMON  
terminal.  
2. An input is continuously activated (Stuck).  
3. Low input AC voltage.  
4. Bad Control Board.  
When the unit power switch is cycled, all LED's (except Power On) turn on at the same  
time and off one after another with the bottom LED turning off first (normal power up).  
1. An input is continuously activated (stuck).  
2. Both limit switches are stuck closed.  
3. Stalled motor.  
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3. MOTOR DOES NOT RUN  
Motor is dead:  
1. The resettable motor thermal overload switch has popped.  
2. The interconnecting cable between the motor and the control board is disconnected.  
3. Bad control board.  
4. Bad motor.  
Motor is stalled:  
1. Frozen motor, gearbox or gate.  
2. V-belt is too tight.  
4. THE CONTROL BOARD RESETS RIGHT AFTER GATE STARTS MOVING  
1. Low AC voltage.  
2. Inadequate and undersized power wiring between the main circuit breaker and the gate  
operator.  
5. GATE STOPS IMMEDIATELY AFTER IT STARTS  
1. A Fault has occured.  
Mostly in cold weather or mornings:  
2. A Fault has occured; Inrush pot adjustment is set too low.  
Power Fail Option was installed recently:  
3. Gate sensitivity adjustments were not reset after installation of the Power Fail Option.  
4. A Fault has occured.  
6. GATE STOPS A FEW SECONDS AFTER IT STARTS  
1. Stuck limit switch.  
2. Limit cams overrun the limit switches prior to gate movement due to loose torque limiter.  
3. A Fault has occured.  
7. GATE STOPS WHILE OPENING OR REVERSES WHILE CLOSING  
A Fault has occured.  
8. OPENING GATE STOPS WHEN A VEHICLE APPROACHES THE GATE  
SLIDE ACTION on switch S1 is set to OFF, causing the Interrupt loop to stop the gate.  
9. GATE OPENS BUT DOES NOT CLOSE  
1. Reclose Timer is OFF.  
2. One of the inputs is continuously activated (a stuck input).  
3. Entry system is connected to the Manual Input by mistake.  
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10. GATE DOESN'T STOP AT THE LIMIT  
1. Limit cams are out off adjustments.  
2. Limit switch cable is disconnected either from the control board or the limit switches.  
3. Bad limit switch.  
11. MOTOR STOPS BUT GATE OVERRUNS THE LIMIT  
Torque limiter slips when the motor stops (The torque limiter is factory adjusted for 75 ft.lb.).  
12. GATE IS TOO SLOW  
1. Low input AC voltage  
2. Hardened or frozen gate hinges.  
3. Slipping torque limiter or belt.  
13. GATE DOESN'T STAY OPEN/CLOSED WITH MANUAL/FIRE INPUTS  
1. Manual inputs or Fire were only activated momentarily not continuously.  
14. GATE DOES NOT CLOSE AUTOMATICALLY  
1. Reclose timer setting is OFF.  
2. The entry system is connected to Manual open by mistake.  
3. An input is continuously activated (stuck ).  
15. OPERATOR DOESN'T RESPOND TO COMMANDS FOR A MINUTE  
1. A fault has occurred and Retry is set to OFF.  
16. ALTERNATE ACTION DOES NOT WORK  
1. ATG and Reclose Timer are ON.  
2. Entry system is connected to the Manual Input by mistake.  
17. GATE DOES NOT OPEN TO THE CORRECT DIRECTION  
1. The power was not cycled after changing the setting of switch S2.  
2. Limit switches are miswired.  
18. AN OPEN GATE DOES NOT CLOSE AT POWER UP  
1. An input is continuously activated (Stuck).  
2. The gate was not on the open limit switch when the power went out.  
3. TIMER on switch S1 is set to OFF.  
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19. GATE DOES NOT MOVE AFTER POWER OUTAGE  
1. Bad Power Fail Option battery.  
2. Miswired DC motor inputs.  
3. Bad connection between the Power Fail Option harness connector and the Control Board.  
4. Power Fail Option Open direction (switch S3) is not set to the correct position.  
5. Battery is connected backwards, causing resettable fuse on the control board to open.  
20. POWER FAIL OPTION WORKS, BUT GATE DOESN'T STOP AT LIMIT  
1. Miswired DC motor inputs.  
2. Bad Power Fail Option harness.  
21. BATTERY DOESN'T RECHARGE WITHIN 4 TO 5 HOURS AFTER USE  
1. Old or bad battery.  
2. Bad harness.  
3. Bad Control board.  
22. POWER FAIL OPTION MOVES THE GATE TOO SLOWLY  
1. Old or not fully charged battery.  
2. Hardened or frozen gate hinges.  
3. Slipping torque limiter or belt.  
4. Belt is too tight.  
23. THERE IS SLACK OR PLAY IN THE GATE  
1. Chain is too loose.  
2. The hardware interconnecting the operator to the gate is not tight.  
3. The large mounting bolt or the jam nut for the cap arm is not tight.  
4. Set screws on the sprocket or the torque limiter are not tight.  
24. ATG (ANTI-TAILGATE) DOES NOT WORK  
1. The ATG setting on switch S1 is OFF.  
2. Entry system is connected to Manual Open by mistake.  
3. Interrupt loop or loop detector is not working properly.  
25. INTERRUPT LOOP DOES NOT ACT PROPERLY  
1. Improper SLIDE and ATG settings.  
2. Bad loop sensor or loop detector.  
3. Bad connection between the loop sensor, loop detector and the Control Board.  
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26. SHADOW LOOP IS INEFFECTIVE  
1. The gate is not at either the open or close limit.  
2. Bad loop sensor or loop detector.  
3. Bad connection between the loop sensor, loop detector and the Control Board.  
4. Only one gate is on the limit (Master/Slave systems only).  
27. MAGLOCK DOES NOT WORK  
1. Bad connection between Maglock, its power supply and the Control Board.  
2. Bad Control Board( relay on the Control Board does not close).  
3. Bad Maglock or Maglock power supply.  
4. Large gap between gates.  
28. MASTER/SLAVE SYSTEM  
Units work as stand-alone:  
1. Miswired or disconnected Master/Slave interconnect cable.  
2. Improper Master/Slave switch S1 setting.  
3. Bad control board.  
Units are not synchronized:  
Improper switch S1 Master/Slave settings.  
One gate braking to stop causes a fault in the other (moving) gate:  
1. Both units are wired to the same circuit breaker.  
2. Undersized power wires.  
B.  
FAULT LIST  
The following conditions can cause a fault in the SW 2000-B1 gate operator system:  
1. Interrupt Bar activation.  
2. Average motor overcurrent (overload) caused by excessive motor current.  
3. Instantaneous motor overcurrent (left/right reverse sense) due to an impact on the gate.  
4. Maximum motor run time exceeding 75 seconds.  
5. Inoperative motor caused by an open motor winding, broken or unconnnected input motor  
wires, or thermal overload.  
6. Limit switch staying closed when gate is supposed to move, caused by a broken V-  
belt, defective limit switch, or defective cams.  
Faults 1, 2 and 3 may be cleared at any time by the following, if Fault Re-Try is ON:  
•
•
All open commands (Open, Radio, Exit, Fire)  
Manual commands (Open, Close, Stop)  
Faults 1, 2 and 3 may be cleared at any time by the following, if Fault Re-Try is OFF:  
•
•
•
Fire command  
Manual commands (Open, Close, Stop)  
All other commands must wait 60 seconds to clear these faults.  
Faults 4, 5 and 6 may be cleared at any time by the following:  
•
•
All open commands (Open, Radio, Exit, Fire)  
Manual commands (Open, Close, Stop)  
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C.  
FAULTS AND THEIR CAUSES  
1. IF FAULT AND OVERLOAD LED’S ARE TURNED ON  
1. OVERLOAD adjustment is set too low (factory setting is at 3:00 o’clock position).  
2. Bad Control board.  
3. Bad motor.  
2. IF FAULT AND REVERSE LED’S ARE TURNED ON  
1. REVERSE or INRUSH adjustment is set too low.  
2. The gate is blocked by an object.  
3. Cold weather: frozen motor or frozen gate hinges.  
4. The Maglock does not disengage from the gate at the start of gate opening.  
5. Power Fail option was installed without readjusting the gate sensitivity adjustments.  
6. A sudden increase in input power.  
7. Bad Control board.  
8. Belt is too tight.  
3. IF MAX RUN TIME LED IS TURNED ON ONLY  
1. Limit cams do not engage the limit switches.  
2. The belt or chain has been broken.  
3. The belt or torque limiter slips during gate movement.  
4. Limit switch cable is disconnected.  
5. Bad limit switch.  
6. Stalled motor.  
4. IF OPEN MTR LED IS TURNED ON ONLY  
1. The motor thermal overload switch is popped.  
2. The wires connecting the motor to the Control Board are disconnected  
3. Bad motor.  
5. IF FAULT LED IS TURNED ON ONLY  
1. A limit switch is stuck closed.  
2. The belt was broken before the start of the gate movement.  
3. Interrupt Bar switch is activated.  
4. Stalled motor at open or close limit.  
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D.  
MAINTENANCE  
WARNING  
To avoid injury, always turn off the unit power switch before working on gate.  
Regularly performance of preventive maintenance is essential for reliable system operation  
because it corrects small problems before they turn into emergencies. LiftMaster recommends  
performing preventive maintenance every 6 to 12 months, depending upon the amount of gate  
usage.  
•
•
If the gate is installed in a private residence or small apartment house where usage is not  
severe, yearly preventive maintenance is acceptable  
If the gate is installed in a high-traffic application, semi-annual preventive maintenance is  
essential.  
PREVENTIVE MAINTENANCE TASKS  
1. Gate Arm: Check for wear in the moving parts. Check for hardware tightness.  
2. Gate: must swing freely without any impediment. Check hinges, grease if necessary.  
3. Chain: Check for wear and tension. If loose, adjust tension with chain tensioner. Do not oil  
chain.  
4. Sprocket: must not be loose in the shaft. Tighten set screws if loose –.  
5. Torque limiter: must not slip (factory setting is 75 ft.lb.). Tighten set screws if loose –.  
6. Limit switches: contacts must bounce back rapidly when they are pressed and released.  
7. Belt: Check for wear and tension (25 to 30 lb.). Adjust the AC motor up or down to set  
proper tension.  
8. Pulleys: must all line up and be firmly secured to their shafts. Tighten set screws if loose –.  
9. Gear Box: Check for no oil leakage around the bushings. Do not oil gearbox.  
10. Control board: Check for water damage or burned spots. All connectors secured to the  
board.  
11. Wiring: Check all wirings for any insulation damage. Check for loose wire connections.  
12. No Rust: Check for rust throughout the unit. Check corners for water entrapment.  
13. Fire Open: Activate Fire department switch to verify emergency gate opening.  
14. Gate Sense: Check for the gate sensitivity (refer to Part 2, System Installation, paragraph I,  
Gate Sensitivity Adjustments).  
15. Power Fail Option: Check for proper operation (refer to Part 2, System Installation,  
paragraph K, Power Fail Option Connection, item B, Power Fail Option Operation Test).  
NOTES:  
–: To prevent loosening, two set screws are used in each hole and LOCTITE threadlocker  
242 is applied.  
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PREVENTIVE MAINTENANCE INSTRUCTIONS  
Figure 20. Gate Operator Disassembly and Assembly.  
Gate Operator Serial Number:  
Power Fail Option: Yes  
No  
One minute after a power outage the Power Fail Option: Opens Gate  
Closes Gate  
⇒ If switch S3 (Power Fail Open Direction switch) is set to open the gate, cycle the gate to its fully  
open position before performing step 1.  
⇒ If switch S3 (Power Fail Open Direction switch) is set to close the gate, cycle the gate to its fully  
closed position before performing step 1.  
♦ Refer to Figure 20, above, to perform the following instructions.  
1. Turn off power to the gate operator at the circuit breaker and wait for one minute.  
2. Inspect Gate Arm (Swing Arm Cap Assembly, Swing Arm and Drag Link Assembly) for wear and  
hardware tightness. Check (ꢀ ) its box in the Maintenance Schedule.  
3. Disconnect Drag Link from Anchor, then loosen mounting bolt and remove Swing Arm Cap  
Assembly and Drag Link Assembly from drive shaft. Set this assembly aside.  
4. Push and pull the Gate to ensure it swings freely (grease if necessary). Check (ꢀ ) its box in the  
Maintenance Schedule.  
5. Remove the cover mounting bolts and remove the gate operator cover.  
6. Reinstall the Drag Link, Swing Arm and Swing Arm Cap Assemblies.  
7. Perform preventive maintenance tasks 3 to 15.  
8. After completing all checks, perform the procedure found in Part 2, System Installation, paragraph  
N, Final Assembly of Gate Operator.  
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The following table was provided to help you keep a record of the maintenance schedule. Write the inspection  
date in the left-hand box and check (ꢀ ) the boxes across as you perform your maintenance procedures.  
MAINTENANCE SCHEDULE TABLE  
Date Arm Gate Chain Sprocket Torque Limit  
Limiter Switches  
Belt Pulleys Gear Control Wiring No Fire Gate PFO  
box Board  
Rust Open Sense  
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APPENDIX A  
SYSTEM OPERATION REFERENCE  
CONTROLS, INDICATORS, INPUTS AND ADJUSTMENTS  
For control and indicator locations, refer to the figure below. For detailed explanations of the Gate  
Operator's various, controls, indicators, inputs and adjustments, refer to the pages that follow.  
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CONTROLS  
SWITCH S1 (OFF/ON DIP SWITCH)  
SLIDE ACTION When used with ATG, this switch controls several gate operator features:  
(S1-1)  
Inside Interrupt Loop: four different modes are selectable:  
SLIDE and ATG OFF: Loop activation prevents the gate from opening or closing. If  
gate is moving, Loop activation stops the gate. When the Loop clears, the gate  
resumes its course.  
SLIDE only ON: Loop activation prevents the gate from closing. If gate is closing,  
Loop activation opens the gate and starts the Reclose Timer, if timer is on.  
ATG only ON: Loop activation prevents the gate from opening or closing. If gate is  
closing, a Loop activation stops the gate. When the Loop clears, the gate  
resumes closing. If the gate is opening or fully open, as soon as the Loop clears,  
the gate immediately begins closing to discourage tailgaters.  
SLIDE and ATG ON: Loop activation prevents the gate from closing. When the Loop  
clears, the gate resumes closing. If gate is opening or fully open, as soon as the  
Loop clears, the gate immediately begins closing to discourage tailgaters.  
Dynamic Braking: When SLIDE is ON, gate brakes whenever it stops.  
When SLIDE is OFF, gate brakes only at open or close limit.  
TIMER  
(S1-2)  
Sets the Reclose Timer to OFF (left) or ON (right). When enabled, the timer  
controls how long the gate waits at the open limit before closing. The Timer can be  
set from 0-250 seconds by adjusting the Reclose Timer pot (R94). During a power  
outage, if the gate is fully open and TIMER is ON, the Reclose Timer starts after  
the restoration of power, causing the fully open gate to close automatically.  
RETRY  
(S1-3)  
Sets the Retry function to OFF (left) or ON (right). When enabled, if the gate meets  
an obstacle, a closing gate reverses and an opening gate stops, waits 30 seconds,  
then tries to resume. The gate will re-try twice before it faults out.  
ATG  
(S1-4)  
Sets Anti-Tailgate function to OFF (left) or ON (right). The Anti-Tailgate feature  
helps prevent two cars from entering on one OPEN command.  
MASTER  
(S1-5)  
In conjunction with the TRAP switch, sets configuration for master/slave system.  
TRAP  
(S1-6)  
In conjunction with the MASTER switch, sets configuration for master/slave system.  
NOTE: For swing gate operation, controls are Right/Clockwise and Left/Counterclockwise.  
SWITCH S2  
GATE OPEN  
Selects the direction the gate will open (left/right).  
TO LEFT/RIGHT  
SWITCH S3  
POWER FAIL  
LEFT/RIGHT  
Selects the direction the power fail operation option will move the gate (left/right)  
if AC power fails.  
INDICATORS  
NOTE: For swing gate operation, controls are Right/Clockwise and Left/Counterclockwise.  
LED indicators light when controls and inputs are active. Additional indicators are as follows:  
LEFT LIMIT  
RIGHT LIMIT  
MTR LEFT  
MTR RIGHT  
XMIT  
Indicates that the LEFT limit switch is activated.  
Indicates that the RIGHT limit switch is activated.  
Indicates that the gate is moving counterclockwise.  
Indicates that the gate is moving clockwise.  
Indicates data is being sent to the other unit in a Master/Slave system.  
RECV  
Indicates data is being received from the other unit in a Master/ Slave  
system.  
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TIMER  
FAULT  
Indicates the Reclose Timer is running. Timer is set at pot R94.  
Indicates a fault in the system. See Fault List in Part 5, Troubleshooting  
and Maintenance.  
MAX RUN TIME  
Indicates the motor ran for more than 75 seconds without reaching a limit  
switch, and was stopped. Usually requires mechanical service. See  
Fault List in Part 5, Troubleshooting and Maintenance.  
REVERSE  
OVERLOAD  
OPEN MTR  
Indicates the peak motor current threshold was reached. See Fault List  
in Part 5, Troubleshooting and Maintenance.  
Indicates that the average motor current threshold was reached. See  
Fault List in Part 5, Troubleshooting and Maintenance.  
Indicates the motor is engaged, but is not drawing any current. The  
thermal overload switch on the motor may need to be reset. See Fault  
List in Part 5, Troubleshooting and Maintenance.  
FUNCTIONAL INPUTS  
NOTES: – The term "activation" means closing an input circuit (via a relay or switch), and may be  
momentary or continuous. Momentary activations are superceded by any command.  
Continuous activations are superceded only by an overriding command.  
— Activating any command when gate is at the open limit stops the Reclose Timer. When  
the command (except Manual CLOSE and STOP) is cleared, the Reclose Timer is reset.  
MANUAL INPUTS: OPEN, CLOSE, AND STOP (TB2)  
MAN OPEN  
Activation fully opens the gate. Continuous activation holds gate open.  
MAN OPEN overrides Anti-Tail-gate (ATG), Reclose Timer, and all controls  
but MAN STOP.  
MAN CLOSE  
MAN STOP  
Activation fully closes the gate. Continuous activation holds gate closed.  
MAN CLOSE overrides all controls but MAN STOP, MAN OPEN and FIRE.  
De-activation stops opening and closing gates. MAN STOP overrides  
Reclose Timer and all other controls, manual or automatic. If MAN STOP is  
disconnected from its COMMON, no commands affect the gate.  
ENTRY SYSTEM/FIRE SWITCH INPUTS (TB9)  
CYCLE Reclose Timer OFF:  
Activation opens the gate, which remains open until another command is  
received. A CYCLE command when the gate is fully open closes the gate.  
This Alternate action allows a single command to both open and close the  
gate. CYCLE also opens a closing gate. If Anti-Tailgating (ATG) is ON,  
Alternate Action is disabled. With ATG ON, the gate begins closing as soon  
as the INTERRUPT LOOP clears.  
Reclose Timer ON:  
Activation opens the gate, then the Reclose Timer closes the gate. A  
CYCLE command also opens a closing gate, but will not close a fully open  
gate if the Reclose Timer is ON. If Anti-Tailgating (ATG) is ON, the gate  
closes as soon as the INTERRUPT LOOP clears.  
FIRE  
Activation opens the gate. Continuous activation holds the gate open. If  
Reclose Timer is OFF, when FIRE is deactivated, gate closes immediately.  
If Reclose Timer is ON, when FIRE is deacitvated, the Reclose Timer starts.  
FIRE overrides all commands but Manual STOP.  
EXIT LOOP/SHADOW LOOP DETECTOR INPUTS (TB10)  
EXIT LOOP Same as CYCLE, but does not close the gate when it is fully open.  
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SHADOW LOOP Activation prevents the gate from opening or closing so the gate won't hit a  
vehicle. If the gate is already moving, or if the gate is not fully opened or  
closed, this input has no effect.  
INSIDE/OUTSIDE INTERRUPT LOOP DETECTOR (TB16)  
INSIDE  
INTERRUPT LOOP with SLIDE "OFF" and ATG "ON"  
Gate fully open or closed: activation prevents the gate from moving.  
When the Interrupt loop clears, the gate begins closing.  
Gate opening or closing: activation halts the gate. When the Interrupt  
Loop clears, an opening gate closes and a closing gate resumes its course.  
INSIDE  
INTERRUPT LOOP with SLIDE "OFF" and ATG "OFF"  
Gate fully open or closed: activation prevents the gate from moving.  
Gate opening or closing: activation halts the gate. When the Interrupt  
Loop clears, the gate resumes its course.  
INSIDE  
INTERRUPT LOOP with SLIDE "ON" and ATG "ON"  
Gate fully open or closed: activation prevents the gate from closing.  
When the Interrupt loop clears, the gate begins closing.  
Gate opening or closing: activation halts a closing gate. When the  
Interrupt Loop clears, an opening gate closes and a closing gate resumes its  
course.  
INSIDE  
INTERRUPT LOOP with SLIDE "ON" and ATG "OFF"  
Gate fully open or closed: activation prevents the gate from closing only.  
Gate opening or closing: activation fully opens a closing gate and starts  
the Reclose Timer if timer is "ON".  
OUTSIDE  
INTERRUPT LOOP with ATG "OFF"  
Gate fully open or closed: activation prevents the gate from closing only.  
Gate opening or closing: activation fully opens the closing gate and starts  
the Reclose Timer if timer is "ON".  
OUTSIDE  
INTERRUPT LOOP with ATG "ON"  
Gate fully open or closed: activation prevents the gate from closing only.  
Gate opening or closing: activation prevents the gate from closing. When  
the interrupt loop clears, the gate begins closing.  
INTERRUPT BAR INPUTS (TB11)  
INTERRUPT BAR Activation fully opens a closing gate and stops an opening gate. If RETRY  
is ON, the gate waits 30 seconds, then tries to resume. The gate will re-try  
twice before faulting out. If the Interrupt Bar remains active for more than 30  
seconds, the gate will not retry.  
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INS./OUTS. INT. SENSE / SHADOW SENSE / EXIT SENSE (TB12/TB13/TB14/TB15) INPUTS  
INSIDE Input from an Inside Interrupt loop provides the signal for an optional  
LiftMaster INTERRUPT  
Interrupt Loop SENSE  
loop detector add-on board. Operation is the same as the  
input, above.  
OUTSIDE  
INTERRUPT  
Input from an Outside Interrupt loop provides the signal for an optional  
LiftMaster loop detector add-on board. Operation is the same as the  
Interrupt SENSE Loop input, above.  
SHADOW  
SENSE  
Input from shadow loop provides signal for optional LiftMaster loop detector  
add-on board. Operation is the same as Shadow Loop input, above.  
EXIT  
on SENSE  
Input from exit loop provides signal for optional LiftMaster loop detector add-  
board. Operation is the same as Exit Loop input, above.  
RADIO INPUT (TB6)  
RADIO RECV  
Convenience terminals provide power (24VAC, 200mA) and signal  
connection for a radio receiver. Activation is the same as CYCLE.  
MAG LOCK INPUT (TB4)  
MAG LOCK NO and COM inputs can close a circuit (i.e., MagLock) when the Close Limit  
switch is activated (the gate is fully closed).  
NC and COM inputs close a circuit (security camera, camcorder, light, etc.)  
when the Close Limit switch is deactivated (when gate is not fully closed).  
SLAVE I/O INPUT (TB1)  
SLAVE I/O  
Input/output terminals are used to control a second gate operator in a  
Master/Slave system.  
ADJUSTMENTS  
OVERLOAD  
(R71)  
Factory-set pot protects the gate operator from excessive motor current.  
If RETRY is ON, when the limit is exceeded, a closing gate reverses a few  
inches and stops, and an opening gate stops, waits 30 second, then tries to  
resume. The gate will retry twice before faulting out.  
NOTE: Gate may be more sensitive to drag in one direction than the other.  
NOTE: For swing gate operation, controls are Right/Clockwise and Left/Counterclockwise.  
REVERSE  
RIGHT (R78)  
Adjustable pot controls gate sensitivity to blockages by the instantaneous  
rise in motor current. If RETRY is ON, when the limit is exceeded, a closing  
gate opens fully and an opening gate stops, waits 30 seconds, then tries to  
resume. The gate will retry twice before faulting out.  
REVERSE  
LEFT (R81)  
Adjustable pot controls gate sensitivity to blockages by the instantaneous  
rise in motor current. If RETRY is ON, when the limit is exceeded, a closing  
gate opens fully and an opening gate stops, waits 30 seconds, then tries to  
resume. The gate will retry twice before faulting out.  
NOTE: LiftMaster gate operators have two reverse sense adjustments (left and right)  
where other gate operators have only one. This allows greater flexibility of  
installation. For instance, you can install a gate on an incline and not worry  
about sacrificing downhill gate sensitivity.  
INRUSH  
(R119)  
Adjustable pot controls the delay in sensitivity to a reverse sense input.  
This delay in sensitivity prevents the initial motor inrush current from  
causing a fault condition. The weight of the gate determines this setting.  
RECLOSE  
TIMER (R94)  
Adjustable pot controls the time delay between gate reaching full open and  
starting to reclose. The Reclose Timer is adjustable from 0-250 seconds.  
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CONNECTORS  
LIMIT SWITCH (J4) Connector for the left/right limit switch cable.  
BATTERY I/O (J11) Connector for use by the Power Fail Operation unit.  
PWR INPUT (J1)  
Connector for AC input power.  
Connector for the motor cable.  
MOTOR POWER (J3)  
LOOP DETECTOR Connector for optional LiftMaster Outside Interrupt Loop detector  
(J15) add-on board.  
LOOP DETECTOR Connector for optional LiftMaster Inside Interrupt Loop detector add-  
(J12) on board.  
LOOP DETECTOR Connector for optional LiftMaster Shadow Loop detector add-on  
(J13) board.  
LOOP DETECTOR Connector for optional LiftMaster Exit Loop detector add-on board.  
(J14)  
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APPENDIX B  
PARALLEL GATE WIRING  
While it is strongly recommended that the Master/Slave function be used in any dual-unit installation,  
two LiftMaster model SW 2000-B1's may be parallel-wired as Bi-Parting gates only.  
NOTES:  
1. When parallel wiring the RADIO INPUT terminals, do not connect the POWER output from one  
board to the POWER output on the other board.  
Failure to observe this will damage both controller boards.  
2. Do not parallel wire the MAGLOCK terminals. Auxiliary device circuits may be damaged if  
separate auxiliary devices are used with each board.  
3. Both gate operators must have the same settings for:  
a. Gate Setting Switch S1  
b. Reclose Timer Pot  
c. Current Sensitivity pots (Left & Right Reverse, Inrush)  
d. Limit Cams  
CAUTION  
The Signal and Common terminals on one board MUST connect to the corresponding Signal and  
Common terminals on the other board. Failure to observe this will damage both controller  
boards.  
DO NOT INTERCHANGE SIGNAL AND COMMON TERMINALS.  
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APPENDIX C  
MODEL SW 2000-B1 PARTS LIST  
ITEM #  
PART NAME  
WHAT IT DOES  
1
Control Box/Clear Cover  
Contains control board, input connections  
Controls gate operator functions  
2
Control Board (not shown)  
ON/OFF Switch  
3
Main power switch, resets gate operator  
Reduces motor speed to drive gate  
Transmits motor power to gearbox  
Provides drive to gate operator  
4
5
Gearbox  
V-Belt  
6
AC Motor  
7
Pillow Blocks  
Support drive shaft  
8
Tray Assembly  
Convenience tray holds optional equipment  
Transmits drive power to chain (not shown)  
Maintains tension on chain (not shown)  
Transmits power to swing arm/drag link assys  
Stops motor when gate reaches limit  
Pulls/releases swing arm/drag link assemblies  
Transmits power to gate  
9
Torque Limiter  
10  
Idler Assembly  
11  
Drive Shaft  
12A/B  
13A/B  
14-17  
18/19  
Limit Cams/Limit Switch Assy  
Swing Arm Cap Assy/Rel. Pin  
Swing Arm/ Linkage/Rod end Assy/Anchor  
Drive Chain/Cover (not shown)  
Drives shaft/Protects unit from elements  
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GLOSSARY  
AC: Alternating Current. An electric current or voltage that reverses direction at regular intervals.  
Alternate Action: Ability to open and close a fully open gate by using the same open command.  
Arc: The area that is swept by a swing gate from fully closed to fully open position.  
ATG: Anti-tailgating refers to a method of immediately closing an opening gate behind a vehicle so  
that an unauthorized vehicle can not follow the authorized vehicle through the gate.  
DC: Direct Current. An electric current of constant value flowing in one direction only.  
Dynamic braking: Stopping the gate by activating the forward and reverse windings of the gate  
operator motor in each half AC cycle.  
Fault: An abnormal condition which causes the gate to stop to protect the gate and the user.  
Gate sensitivity: The response of the gate operator to an exerting force to the gate.  
Gear Box: A device that changes the speed and power of its driving force (motor).  
Inrush current: Initial current drawn into an electrical device due to its capacitive or inductive nature.  
Interrupt Bar or Edge: A switch which is installed at the edge of a gate to protect an object which is  
situated between the gate and the gate frame.  
LED: Light Emitting Diode. LEDs are indicators placed on the controller board which light up to  
indicate an action in the system.  
Limit switch: A switch which its closure indicates the gate has reached its open or close limit, causing  
the gate to stop. There are two limit switches, open and close.  
Limit cam: An object which its excursion corresponds to the gate traveling distance and closes the  
limit switch at the open or close limit of the gate.  
Loop sensor: A wire embedded in the ground for magnetically sensing large metallic objects (cars).  
✔ Exit or Open Loop: activation opens the gate.  
✔ Interrupt or Reverse or Reopen Loop: activation reverses or stops the gate.  
✔ Shadow Loop: activation prevents a fully open or closed gate from moving while a vehicle  
is inside the arc of a swing gate.  
Loop detector: An electronic device that is activated by a loop sensor sensing a metallic object.  
Master/Slave: A synchronized system containing a pair of gate operators.  
Maglock: An electric magnet which is used to secure the closed gate.  
Power Fail Option: A battery backup system which opens or closes the gate at power outage.  
Pulley: A grooved wheel which transfers power via a belt.  
Reclose Timer: An electronic timer which closes the fully open gate automatically.  
Retry: A condition at which the stopped gate resumes its course automatically after the occurrence of  
a Fault.  
RPM: Rotation Per Minute is a term to indicate the speed of an rotary object.  
Sprocket: A toothed wheel which transfers power via a chain.  
Thermal overload: A condition at which a heat producing device shuts off automatically when it  
reaches a critical and damaging temperature level.  
Torque: A force that causes rotation.  
Torque Limiter: A clutch-like mechanism used to relieve excessive torque generated by the gate on  
the gate operator.  
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NOTICE TO CANADIAN USERS  
NOTICE: The Industry Canada label identifies certified equipment. This certification means that the  
equipment meets telecommunications network protective, operation and safety requirements as  
prescribed in the appropriate Terminal Equipment Technical Requirements document(s). The  
Department does not guarantee the equipment to the user’s satisfaction.  
Before installing this equipment, users should ensure that it is permissible to be connected to the  
facilities of the local telecommunications company. The equipment must also be installed using an  
acceptable method of connection. The customer should be aware that compliance with the above  
conditions may not prevent degradation of service in some situations.  
Repairs to certified equipment should be coordinated by a representative designated by the supplier.  
Any repairs or alterations made by the user to this equipment, or equipment malfunctions, may give the  
telecommunications company cause to request the user to disconnect the equipment.  
Users should ensure for their own protection that the electrical ground connections of the power utility,  
telephone lines and internal metallic water pipe system, if present, are connected together. This  
precaution may be particularly important in rural areas.  
Caution: Users should not attempt to make such connections themselves, but should contact the  
appropriate  
electric  
inspection  
authority,  
or  
an  
electrician,  
as  
appropriate.  
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COPYRIGHT2001  
ALL RIGHTS RESERVED  
This document is protected by copyright and may not be copied or adapted without the prior written  
consent of LiftMaster. This documentation contains information proprietary to LiftMaster and such  
information may not be distributed without the prior written consent of LiftMaster. The software and  
firmware included in the LiftMaster product as they relate to this documentation are also protected by  
copyright and contain information proprietary to LiftMaster.  
FOR TECHNICAL SUPPORT  
TO ORDER REPAIR PARTS  
Call our toll free numbers:  
Call our toll free numbers:  
(800) 528-2806  
(800) 998-9197  
(800) 323-2276  
(800) 998-9197  
Prepare to provide the following  
information when ordering repair parts:  
Installation and service information is  
available six days a week.  
ꢀ
ꢀ
ꢀ
Part Number  
Part Name  
Model Number  
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