Honeywell SPRING RETURN ML6275 User Manual

ML6275  
Spring Return  
Direct Coupled Rotary Actuator  
PRODUCT DATA  
FEATURES  
Mounts directly on horizontal 3/8 in., 1/2 in., and  
5/8 in. round and square damper shafts by using  
the appropriate insert. Most models are shipped with  
1/2 in. insert.  
Provides 25 lb-in. running and spring return torque.  
Magnetic coupling eliminates the need for mechanical  
stops or limit switch adjustments by limiting stall  
torque to 60 lb-in. maximum.  
95° stroke provides necessary compression of rubber/  
neoprene gaskets commonly used on 90° low leakage  
dampers.  
88 second synchronous timing can eliminate need for  
feedback position indication in closed-loop  
temperature control applications.  
Removable splined output hub permits premounting of  
hub on damper shaft, providing installation flexibility.  
Reversible mounting allows actuator to be used for  
either clockwise (cw) or counterclockwise (ccw)  
spring rotation.  
Designed for both single-point and three-point  
mounting, to allow installation flexibility.  
Available with or without a time-out feature. Models  
without the time-out feature are designed to be used  
with intelligent building management system and/or  
controller.  
Standard models have two 8 mm by 12 mm long set  
screws for securing the damper shaft. Actuator models  
available for various shaft sizes that allow damper shaft  
to operate centered inside the output hub.  
Standard one-meter cable with color-coded leadwires  
allows external wire connections with 1/2 in. conduit  
connectors.  
APPLICATION  
The ML6275 Spring Return Direct Coupled Rotary Actuator is  
a floating control motor with an internal, electrically isolated  
feedback potentiometer that can be used with controls that  
provide switched or floating single pole double throw (spdt)  
control output to operate dampers in heating, ventilation, and  
air conditioning (HVAC) applications. The feedback potentio-  
meter provides indication of the motor output hub position and  
can be used for rebalancing an internal control circuit.  
Two or more actuators can be mounted on one  
damper shaft to increase output torque for use on  
dampers larger than eight square feet.  
Contents  
General ...............................................................................  
Features ..............................................................................  
Specifications ......................................................................  
Ordering Information ...........................................................  
Installation ...........................................................................  
Operation ............................................................................  
1
1
2
2
4
9
Checkout ............................................................................. 11  
Copyright © 1995 Honeywell Inc.  
All Rights Reserved  
63-2493-1  
ML6275 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR  
1-5/32 (29)  
6-25/32 (173)  
1-17/32 (39)  
3-1/16  
(79)  
8-9/32 (210)  
3-29/32  
(99)  
23/32  
(18)  
3-15/16 (100)  
1-21/32  
(42)  
3-1/2  
(89)  
1-5/8  
(41)  
1-9/32  
(32)  
CLEARANCE  
REQUIRED  
FOR SPLINED  
HUB MOUNTING  
1/2 (13)  
3-29/32  
(99)  
1-13/32  
(36)  
1-3/32  
(28)  
135o  
15o  
13/32  
(10)  
13/64 (5)  
3/4 (19)  
5/16  
(8)  
3/8  
(10)  
1-13/32 (36)  
4-13/32 (112)  
1-5/8 (41)  
10-13/32 (264)  
M8257  
MOUNTING BRACKET  
Fig. 1. Approximate dimensions of ML6275 Spring Return Direct Coupled Actuator and mounting bracket in in. (mm).  
Accessories:  
Environmental Protection Ratings:  
205753 Hub Sleeve, 3/8 in  
205758 Hub Sleeve, 5/8 in  
205820A 3-Point Mounting Kit  
205830A Crank-Arm Accessory  
205840A Tandem Mount Kit  
205850A End Stop Kit  
NEMA1 standard with damper shaft in horizontal position  
Mounting Tab:  
For use with Universal mounting bracket  
3
63-2493—1  
ML6275 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR  
INSTALLATION  
CAUTION  
Do not use the actuator as a shaft bearing. The  
actuator must be used only to supply rotational torque.  
To prevent damage to the actuator, avoid any side  
loads to the actuator output coupling bearings.  
When Installing this Product…  
Read instructions carefully. Failure to follow them could  
damage the product or cause a hazardous condition.  
Check ratings and description given in the specifications  
to make sure the product is suitable for your application.  
Installer must be a trained, experienced service  
technician.  
Preparation  
Before installing the ML6275 on the damper shaft, determine  
the opening direction of the damper shaft to determine the  
correct spring return rotation and correctly connect the wiring.  
The ML6275 can be mounted to provide clockwise or  
counterclockwise spring return. Reverse the actuator if  
necessary to provide the desired spring action.  
After installation is complete, check out product operation  
as provided in these instructions.  
CAUTION  
1. Disconnect power before installation to prevent  
electrical shock or equipment damage.  
Installation  
Installing the Actuator and Mounting Bracket  
2. Never turn motor output hub by hand or wrench.  
3. Do not install actuator in areas with acid fumes or  
other deteriorating vapors that might attack the  
metal parts of the actuator.  
4. Do not install actuator in areas with escaping gas  
or other explosive vapors that could be ignited by  
a spark from the actuator or attached accessories.  
(Single Point Mounting)  
When the direction of the damper shaft rotation is determined  
(either cw  
or ccw  
), proceed as follows:  
Place the ML6275 Direct Coupled Actuator over the  
damper shaft.  
Position the actuator for best access to the actuator  
damper shaft locking screw.  
Install the mounting bracket (see Fig. 2) and adjust it to  
support the actuator at the correct height. Mark the  
screw holes for installing the mounting bracket on the  
damper housing.  
Remove the mounting bracket and actuator.  
Drill or center punch the starting holes for the mounting  
bracket screws (or use no. 10 self-tapping sheet metal  
screws).  
Location  
Install the actuator in any location free from acid fumes or  
other deteriorating vapors that might attack the metal parts of  
the actuator. Make sure the location is not subject to  
escaping gas or other explosive vapors that could  
accidentally be ignited by a spark from the actuator or its  
attached parts.  
Install the actuator in a location that allows enough clearance  
for mounting accessories and for servicing.  
Place the actuator and mounting bracket back into  
position over the damper shaft and install the mounting  
bracket screws.  
Tighten the two 8 mm by 12 mm long set screws firmly  
against the damper shaft (maximum tightening torque is  
100 lb-in.).  
Mounting  
The ML6275 Direct Coupled Actuator is designed to operate  
a damper by driving the damper shaft either cw  
ccw depending on damper design. All actuators are  
shipped in the fully closed position.  
or  
0
9
0
6
0
3
The ML6275 Direct Coupled Actuator is designed for single-  
point mounting when using an adapter bracket. Single-point  
mounting is typically used when the actuator is mounted on  
the damper frame.  
A mounting bracket (see Fig. 1) is provided with some models  
to aid in installing the actuator. The bracket can be bent to any  
shape to support the actuator at the correct height.  
The ML6275 Direct Coupled Actuator can also be three-point  
mounted using the two front gear housing slots and the  
adapter bracket. Two screws are secured through the two  
front gear housing slots and the adapter bracket positioned to  
secure the rear of the actuator. Three point mounting is used  
for foot mounting the actuator or internally mounting the  
actuator in the duct when direct shaft coupling is not possible.  
M9386  
Fig. 2. Installing mounting bracket on ML6275 Direct  
Coupled Actuator.  
4
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ML6275 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR  
The ML6275 Direct Coupled Actuator has a reversible output  
Installing the Actuator for Three-Point Mounting  
hub. The hub is factory-mounted on the top of the actuator  
gear housing. When attaching to damper shafts less than 3.5  
in. (76 mm) long, or for ease of mounting, the output hub can  
be mounted to the inside of the actuator gear housing. See  
Fig. 3. Be careful when removing the retaining ring that  
secures the output hub to the actuator housing. Use a  
flatheaded screwdriver to pry the ring loose.  
The ML6275 Direct Coupled Actuator is designed with  
removable hub sleeves to accommodate specific damper  
shaft sizes. Proper sleeve selection is necessary when three-  
point mounting is used to avoid excessive strain on the output  
gear. Most ML6275 Actuators are shipped with a 1/2 in. hub  
sleeve. For field use, several hub sleeve sizes are available.  
See the Accessories listing in the Specifications section. Shaft  
sizes are stamped on the sleeves.  
Other possible mounting configurations and standard  
connections are shown in Fig. 4 through 7.  
The ML6275 Direct Coupled Actuator can be mounted directly  
on the motor shaft with the actuator in any position when the  
actuator housing is parallel with the damper housing or frame.  
(See Fig. 7.)  
2
6
1
3
60  
30  
90  
DETENT  
INSERT  
60  
30  
0
4
5
.500  
INDICATOR  
. 5 0 0  
DETENTS  
M7228  
Fig. 3. Mounting hub to inside of actuator.  
5
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ML6275 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR  
0
6
0
3
0
9
0
6
0
3
0
1
INDICATOR  
DETENTS  
1
COUNTERCLOCKWISE SPRING ROTATION ARROW  
M7230A  
Fig. 4. ML6275 Actuator mounted for counterclockwise spring rotation with output hub inside actuator. (NOTE: NEMA  
rating applies only with damper shaft in horizontal position.)  
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ML6275 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR  
0
6
0
0
3
9
0
6
0
3
.500  
. 5 0 0  
M7229  
Fig. 5. Standard direct coupled mounting of ML6275 to a damper with counterclockwise spring rotation.  
7
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ML6275 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR  
Wiring  
CAUTION  
Disconnect power supply before wiring to prevent  
electrical shock or equipment damage.  
All wiring must comply with local electrical codes, ordinances  
and regulations. The ML6275 is designed for use with a Class  
2 power supply. Voltage and frequency of the transformer  
used must correspond with the characteristics of the motor  
and those of the power supply. See Fig. 8 for a typical wiring  
connection.  
60  
30  
90  
60  
30  
.500  
The ML6275 has an aluminum die cast housing with two  
integral cast bosses on the end of the device, tapped for  
1/2 in. conduit fittings. Some models are shipped with a water  
seal in the conduit opening. If conduit is needed, remove the  
seal before routing the cable.  
. 5 0 0  
ML6275 Models with Factory-mounted Auxiliary  
Switches (See Fig. 9)  
ML6275C,F models have two nonadjustable line voltage rated  
spdt auxiliary switches that are factory set to make common  
to normally open at 12° and 82° rotation from the  
counterclockwise stop. See Fig. 9.  
IMPORTANT:  
TO JUNCTION  
BOX (UP TO  
3 FT AWAY)  
Actuators driving in parallel may not be synchronized  
with each other. In normal operation, when all  
actuators are driven to the fully open or fully closed  
position, the actuators are again synchronized.  
MOUNTING  
BRACKET  
M7231  
FEEDBACK WIRING  
ORANGE (OPEN)  
Fig. 6. ML6275 Actuator standard electrical connection.  
TAN  
3
GREEN (CLOSED)  
ML6275  
OPEN  
BLUE  
MOTOR  
CLOSE  
YELLOW  
OPTIONAL  
TIME OUT  
2
24 HOT  
RED  
POWER  
SUPPLY  
1
SPRING  
CONTROL  
60  
L1  
30  
90  
60  
(HOT)  
24 VAC  
24 GND  
BLACK  
30  
0
L2  
500  
5 0 0  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
PROTECTION AS REQUIRED.  
2
3
TIME-OUT FUNCTION AVAILABLE WITH ML6275D,F MODELS.  
M9954A  
500 OHM POTENTIOMETER.  
Fig. 8. ML6275 typical wiring diagram.  
M9384  
Fig. 7. ML6275 Actuator can be mounted in any position.  
(NOTE: NEMA rating applies only with damper shaft in  
horizontal position.)  
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63-2493—1  
ML6275 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR  
WHITE/RED  
12°  
AUX. SWITCHES  
3A, 120 VAC  
OPERATION  
WHITE/BLUE  
WHITE/YELLOW  
BLACK/RED  
The ML6275 Direct Coupled Actuator is designed to be used  
82°  
in ventilating and air conditioning installations to operate  
dampers, ventilation flaps and louvers requiring up to 25 lb-in.  
torque. If the power fails, the actuator will spring return to the  
BLACK/BLUE  
BLACK/YELLOW  
M7227A  
starting position. The actuator is designed for reversible  
Fig. 9. ML6275C,F wiring for auxiliary switches.  
mounting. Arrows are molded into the covers to show the  
spring return direction. The larger cover shows a  
counterclockwise (ccw) spring rotation; the smaller cover  
shows a clockwise (cw) spring rotation.  
Connecting ML6275 Actuators in Parallel  
ML6275 Actuators can be stacked on one damper shaft to  
increase the output torque required to drive dampers larger  
than eight square feet.  
The ML6275 Direct Coupled Actuator is operated by an spdt  
floating controller. When using an spdt floating controller, the  
actuator will be driven toward its fully open position when the  
controller makes R to B and toward the fully closed position  
when the controller makes R to W. It stops when neither  
contact is made.  
To make sure proper phasing occurs, connect all four  
leadwires (red, black, yellow and blue) in parallel. The  
number of actuators that can be wired in parallel is  
dependent on the transformer VA rating. Make certain that  
the connected load does not exceed the current capacity of  
the controller/thermostat. See Fig. 10 and 11.  
IMPORTANT  
The ML6275 is designed to respond to  
instantaneous contact closures from a DDC  
Controller. Be careful not to short cycle the actuator.  
Unstable damper control can cause premature  
actuator failure.  
ML6275  
CONTROLLER  
BLUE  
YELLOW  
1
The actuator has a position indicator to show shaft position.  
As the indicator moves with the shaft, it gives an angular  
representation of the damper position. There are four distinct  
positions where the indicator can be placed. The indicator can  
be removed (by first removing the output hub) to provide  
proper damper orientation. The indicator can be indexed to  
show cw or ccw open or closed, using the detents that are  
90° apart. See Fig. 12. If the spring return position is the open  
position, rotate the indicator until it points to 90 on the scale. If  
the spring return position is the closed position, rotate the  
indicator until it points to zero on the scale. A detent can be  
felt at both stops; the detents maintain the indicator position.  
RED  
L1  
(HOT)  
BLACK  
L2  
ML6275  
CONTROLLER  
BLUE  
YELLOW  
RED  
BLACK  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS  
AND OVERLOAD PROTECTION AS REQUIRED.  
M9953A  
The ML6275D and ML6275F models provide a timeout  
function that removes power from the actuator submotor if the  
actuator remains in one position (closed, open, or any  
intermediate position) for longer than a nominal 100 seconds.  
This time-out function helps to extend actuator life.  
Fig. 10. Common transformer with two controller outputs  
and two actuators.  
ML6275  
IMPORTANT  
The ML6275 was designed to provide 7500 spring  
returns. Therefore, the actuator can be unpowered  
daily for night shutdown control. However, rapidly  
cycling the actuator by removing control voltage will  
lead to premature spring failure.  
CONTROLLER  
BLUE  
YELLOW  
1
RED  
L1  
(HOT)  
BLACK  
L2  
ML6275  
BLUE  
YELLOW  
RED  
BLACK  
1
POWER SUPPLY. PROVIDE DISCONNECT  
MEANS AND OVERLOAD PROTECTION  
AS REQUIRED.  
M7758  
Fig. 11. Common transformer with one controller output  
and two actuators.  
9
63-2493—1  
ML6275 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR  
FULLY COUNTERCLOCKWISE SPRING RETURN INDICATOR START POSITIONS  
POINTER AT 90°  
POINTER AT 0°  
90  
90  
60  
60  
60  
60  
30  
0
30  
0
30  
0
30  
0
DETENT IN INSERT  
DETENT IN INSERT  
DRIVE CLOCKWISE TO CLOSE  
(REVERSE ACTING)  
DRIVE CLOCKWISE TO OPEN  
(DIRECT ACTING)  
FULLY CLOCKWISE SPRING RETURN INDICATOR START POSITIONS  
POINTER AT 90°  
POINTER AT 0°  
90  
90  
60  
60  
60  
60  
30  
0
30  
0
30  
0
30  
0
M7235  
DETENT IN INSERT  
DETENT IN INSERT  
DRIVE COUNTERCLOCKWISE  
TO CLOSE (REVERSE ACTING)  
M7235B  
DRIVE COUNTERCLOCKWISE  
TO OPEN (DIRECT ACTING)  
Fig. 12. ML6275 indicator start positions.  
10  
63-2493—1  
ML6275 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR  
4. Connect 24 Vac to the appropriate leadwires (red to  
blue or red to yellow) to move the damper to the  
opposite position. The ML6275 should drive the  
CHECKOUT  
The ML6275 Direct Coupled Actuator can be checked out  
either directly or by using a controller.  
damper.  
5. If the actuator does not run, verify that the actuator is  
properly installed for either cw  
rotation.  
6. If the actuator operates in the opposite direction than  
desired, reverse the blue and yellow leadwires.  
7. If the actuator is correctly installed and still does not  
run, replace the actuator.  
or ccw  
Important  
When power is interrupted, the actuator returns to  
the normal starting position using the spring  
mechanism. When power is restored, the controller  
input will not operate the actuator until the spring is  
fully wound and locked. The spring winding process  
takes approximately 100 seconds, depending on the  
number of degrees of spring return remaining at  
power interrupt (eg, 10° of spring return remaining  
takes ten seconds). (If the actuator is not in the  
closed position, it will run to the closed position while  
the spring is winding.) Once the spring is locked in  
its fully wound position, the actuator responds to  
inputs across the red-to-blue or red-to-yellow  
leadwires.  
Controller Checkout  
1. Adjust the setpoint of the controller to call for cooling.  
Observe the actuator.  
2. If the damper is closed, it should begin to open.  
3. If the damper remains closed, move the setpoint of the  
controller farther below the room temperature.  
4. If the damper still does not move, check for the  
presence of 24 Vac in the input.  
5. Make sure the actuator spring is fully wound by  
applying power for at least 100 seconds.  
6. If 24 Vac is present and the actuator does not operate,  
reverse the controller leadwires to determine if the  
device was miswired.  
7. If the wiring is correct and 24 Vac is present on the  
input terminals but the actuator does not run, replace  
the actuator.  
Direct Checkout  
1. Mount the actuator for the required application (either  
cw  
or ccw  
rotation to open the damper).  
2. Check the damper position and make sure that 24 Vac  
is present on the red and black leadwires.  
3. Make sure the actuator spring is fully wound and locked  
by applying power for at least 100 seconds.  
11  
63-2493—1  
Home and Building Control  
Honeywell Inc.  
1985 Douglas Drive North  
Golden Valley, MN 55422  
Home and Building Control  
Honeywell Limited-Honeywell Limitée  
740 Ellesmere Road  
Helping You Control Your World  
Scarborough, Ontario  
QUALITY IS KEY  
M1P 2V9  
63-2493—1 G.R. Rev. 11-95 Printed in U.S.A.  

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