Honeywell ML6420 User Manual

ML6420, ML7420  
Non-Spring Return  
Electric Linear Valve Actuators  
PRODUCT DATA  
FEATURES  
Quick and easy installation.  
No separate linkage required.  
Conduit connector is standard.  
No adjustments required.  
Low power consumption.  
High close-off ratings.  
Force-limiting end switches.  
Manual operator.  
Synchronous motor.  
Corrosion resistant design.  
Maintenance free.  
APPLICATION  
Direct/reverse acting with ML7420.  
Position feedback signal included with ML7420.  
The ML6420 Non-Spring Return Electric Linear Valve  
Actuators are floating control actuators used with controllers  
that provide a switched or floating single-pole double-throw  
(spdt) output. These actuators operate standard Honeywell  
valves in heating, ventilating, and air conditioning (HVAC)  
applications.  
Selectable 0 to 10 Vdc or 2 to 10 Vdc signal input with  
ML7420.  
The ML7420 Non-Spring Return Electric Linear Valve  
Actuators are modulating control actuators used with  
controllers that provide an analog output of 0 to 10 Vdc or 2 to  
10 Vdc. These actuators operate standard Honeywell valves  
in HVAC applications. An internal selector plug can be used to  
reverse the direction of action.  
Contents  
Ordering Information ........................................................  
2
63-2533-03  
 
ML6420, ML7420 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS  
Table 1. Close-off ratings for ML6420, ML7420 Electric Linear Valve Actuators and Honeywell Valves (psi).  
Type  
Valve  
1/2 in.  
3/4 in.  
1 in. 1-1/4 in. 1-1/2 in. 2 in. 2-1/2 in. 3 in.  
Flange  
V5011A  
28  
21  
16  
14  
V3350/3351/3450/3451  
a
a
V5013B,C; V3360/3361/3460/3461  
21  
28  
14  
16  
b
b
b
b
NPT  
V5011F,G  
V5011H,J  
77  
49  
150  
150  
150  
150  
230  
100  
150  
150  
150  
163  
100  
150  
134  
145  
104  
100  
126  
V5011N1xxx, V5011N3xxx, V5013N 230  
67  
37  
V5011N2xxx  
V5013F  
100  
150  
77  
49  
a
Represents maximum pressure difference between the outlet and either of the two inlets.  
Do not exceed 100 psi with V5011G valves used in steam applications.  
b
CAUTION  
5-5/15 6-5/16  
x
12-11/16 (322)  
MINIMUM  
CLEARANCE  
Electrical Shock or Equipment Damage Hazard.  
Can shock individuals or short equipment circuitry.  
Disconnect power supply before installation.  
(135)  
(161)  
2-11/16 (67)  
Location  
Install the actuator in a location that allows enough clearance  
for mounting accessories and for servicing.  
9-3/16  
(233)  
9-9/16  
(242)  
CAUTION  
Equipment Damage Hazard.  
5-9/16  
(141)  
1/2 (13) FPT  
YOKE  
Can damage actuator due to condensation or a  
valve gland leak.  
Install the actuator in a position above horizontal.  
DIAMETER  
1-3/8 (35)  
Mounting  
1. Place the actuator on the valve with the U-bolt around  
the valve collar. See Fig. 2.  
M17419  
2. Place the U-bolt against the valve collar and secure the  
actuator to the valve by turning each U-bolt nut clock-  
wise.  
Fig. 1. Approximate dimensions of ML6420, ML7420  
Electric Linear Valve Actuator in in. (mm).  
NOTE: To assure even pressure on the collar, first  
tighten the nuts finger-tight and then alternate  
turning each U-bolt nut until both are snug.  
INSTALLATION  
When Installing this Product...  
3. Push aside the stem button retaining clip and hold. See  
Fig. 3.  
4. Lift valve stem until the head of the valve stem button is  
inside the large slot of the stem button retaining clip on  
the actuator.  
5. Release the stem button retaining clip to secure the stem  
button. Check to make certain the stem button is secured  
by the retaining clip.  
1. Read instructions carefully. Failure to follow them could  
damage the product or cause a hazardous condition.  
2. Check ratings and description given in the specifications  
to make sure the product is suitable for your application.  
3. Installer must be a trained, experienced service  
technician.  
4. After installation is complete, check out product  
operation as provided in these instructions.  
6. Remove the cover from the actuator using a Phillips or  
crosspoint screwdriver. See Fig. 4.  
3
63-2533—03  
 
ML6420, ML7420 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS  
All wiring must comply with local electrical codes, ordinances  
and regulations. Voltage and frequency of the transformer  
used with the actuator must correspond with the power supply  
and actuator characteristics. See Fig. 6 through 11 for typical  
wiring hookups.  
1. Feed power and control wires through the conduit  
connector located on the bottom of the actuator case.  
See Fig. 5.  
CAUTION  
Equipment Damage Hazard.  
Conduit connection or removal can break an  
unsupported connector.  
When removing or attaching conduit, use a wrench to  
support the motor connector.  
2. Using the wiring diagram in Fig. 6, connect power and  
control wires. Make sure that all wiring is correct.  
3. For ML7420 only: Check the selector plugs for proper  
settings. See Signal Input Failure section for details.  
4. When wiring is complete, replace the actuator cover. See  
Fig. 7.  
M6632  
Fig. 2. Attaching actuator to valve collar.  
5. Apply power and control signals to the actuator.  
M6630  
M6633  
Fig. 5. Connecting power and control wiring.  
Fig. 3. Securing actuator to valve.  
ML6420A,B  
WIRING  
T6984 (FLOATING CONTROLLER)  
4
2
STRIP  
T1  
MOTOR OPEN  
MOTOR CLOSE  
T2  
24 Vac  
W
COMMON  
B
O
1
2
POWER SUPPLY. PROVIDE DISCONNET MEANS  
AND OVERLOAD PROTECTION AS REQUIRED.  
ALL WIRING BLOCKS HAVE THE SAME  
NUMBER OF TERMINALS (8), BUT THE ONLY  
TERMINALS THAT ARE ACTIVE ON THIS  
BLOCK ARE T1, T2, W, AND B.  
3
1
T
Y
G
M17420  
3
4
THE T-Y-G TERMINALS ARE A THREE TERMINAL  
WIRING BLOCK SEPARATE FROM THE MAIN  
BLOCK. THEY DO NOT APPEAR ON ALL MODELS  
BECAUSE THEY ARE FOR A SINGLE FEEDBACK  
POTENTIOMETER (10K OR 220 OHMS). THE  
REQUIRED WIRING BLOCKS ARE PART OF  
THE POTENTIOMETER ACCESSORY KITS.  
Fig. 4. Removing actuator cover.  
L1  
(HOT)  
L2  
Wiring  
MOTOR OPEN SIGNAL DRAWS VALVE STEM  
UPWARDS. MOTOR CLOSE SIGNAL DRIVES  
VALVE STEM DOWNWARDS.  
M32766  
CAUTION  
Electrical Shock or Equipment Damage Hazard.  
Can shock individuals or short equipment circuitry.  
Disconnect power supply before installation.  
Fig. 6. ML6420 wiring.  
63-2533—03  
4
ML6420, ML7420 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS  
ML7420  
WIRING  
STRIP  
ML7420  
2
SENSOR  
WIRING  
STRIP  
INPUT  
(FEEDBACK)  
OUTPUT  
F
F
2
2
4
6
1
3
1
5
+
+
1
F
L1  
(HOT)  
3
+
T2  
T1  
O1  
O2  
L2  
DUAL  
TRANSFORMERS  
T2  
T1  
O1  
O2  
3
1
500 OHM  
RESISTOR  
L1  
(HOT)  
T775  
(WITH 4-20 MA OUTPUT)  
L2  
L1  
1
2
3
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
(HOT)  
1
L2  
2-10 Vdc FEEDBACK SIGNAL. SEE OUTPUT SIGNAL  
FEEDBACK SECTION.  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS  
AND OVERLOAD PROTECTION AS REQUIRED.  
M17425  
0-10 Vdc OR 2-10 Vdc CONTROL SIGNAL. SEE SIGNAL  
INPUT (+) SECTION.  
M17422  
Fig. 10. ML7420 wiring using a 4 to 20 mA  
control signal and separate transformers.  
Fig. 7. ML7420 wiring using feedback output from  
a controller with a common transformer.  
SENSOR  
ML7420  
ML7420  
SENSOR  
WIRING  
STRIP  
WIRING  
STRIP  
2
2
4
6
1
3
3
1
5
2
2
4
6
1
3
1
5
1
L1  
(HOT)  
1
F
F
L1  
(HOT)  
+
+
L2  
L2  
SINGLE  
TRANSFORMER  
40 VA 24 VAC  
DUAL  
TRANSFORMERS  
T2  
T1  
O1  
O2  
T2  
T1  
O1  
O2  
3
500 OHM  
RESISTOR  
T775  
T775  
(WITH 2-10 VDC OUTPUT)  
(WITH 4-20 MA OUTPUT)  
L1  
(HOT)  
L2  
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS  
AND OVERLOAD PROTECTION AS REQUIRED.  
M17426  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS  
AND OVERLOAD PROTECTION AS REQUIRED.  
M17423  
Fig. 11. ML7420 wiring using a 4 to 20 mA  
control signal and a common transformer.  
Fig. 8. ML7420 wiring using a 2 to 10 Vdc  
control signal and separate transformers.  
W3  
W2  
W1  
ML7420  
SENSOR  
WIRING  
STRIP  
2
2
4
6
1
3
1
5
50% 100%  
0%  
1
F
L1  
(HOT)  
+
L2  
SINGLE  
TRANSFORMER  
40 VA 24 VAC  
T2  
T1  
O1  
O2  
3
T775  
(WITH 2-10 VDC OUTPUT)  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS  
AND OVERLOAD PROTECTION AS REQUIRED.  
M32767  
M17424  
Fig. 12. Location of W1, W2, and W3 selector plugs.  
Fig. 9. ML7420 wiring using a 2 to 10 Vdc  
control signal and a common transformer.  
5
63-2533—03  
ML6420, ML7420 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS  
M17428  
Fig. 13. Replacing actuator cover.  
63-2533—03  
6
ML6420, ML7420 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS  
Auxiliary Potentiometers  
The 43191679 Auxiliary Potentiometers can be used as  
feedback potentiometers and to provide remote indication of  
valve position. See the Installation Instructions packed with the  
potentiometers.  
Auxiliary Switches  
The 43191680 Dual Auxiliary Switch can be used on both the  
ML6420 and ML7420 Electric Linear Valve Actuators. Switching  
points are adjustable over the full length of the actuator stroke;  
for example, the switch can be used to switch pumps or to  
provide remote indication of any stroke position. See the  
Installation Instructions packed with the auxiliary switch.  
CAUTION  
Equipment Damage Hazard.  
Improper voltage damages the auxiliary switch  
beyond repair.  
Use the 43191680 Dual Auxiliary Switch only with  
M6640  
24 Vac applications.  
Fig. 14. Manual operator knob.  
OPERATION  
ML7420  
General  
Signal Input (+)  
In the actuator, the drive of a synchronous motor is converted  
into the linear motion of the actuator stem by using a spur gear  
transmission. A button retainer clip connects the actuator stem  
to the valve stem.  
The analog input signal (+) range is set at the factory to 0 to 10  
Vdc. Changing the position of the W2 selector plug sets the  
range to 2 through 10 Vdc. Selector plugs W1, W2, and W3 are  
positioned on the back side of the printed circuit board. See  
Fig. 12 for location of the selector plugs.  
Manual Operation  
Signal Input Failure  
The ML6420 and ML7420 are equipped with a manual  
operator knob (see Fig. 14) to open or close the valve in the  
event of power failure:  
Using the potentiometer, the actuator can be set to run to any  
position in event of a signal failure (ML7420/25 only). ML6420  
does not have any input signal failure jumpers or  
potentiometers.  
1. Turn off or disconnect the power supply before manually  
operating the actuator.  
2. Push down on the manual operator knob and turn the  
knob:  
Output Signal Feedback (F)  
a. Counterclockwise to drive the stem downward.  
b. Clockwise to draw the stem upward.  
An analog output signal (2 to 10 Vdc) that represents the actual  
actuator stem position is available at terminal F. It can be used  
for remote indication of the stem position. When the actuator  
stem is fully downward, the output signal is 10 Vdc.  
IMPORTANT  
Manual operation allows very high closing force that  
can jam the actuator spindle, exceed the force switch  
ratings, and stop the motor. After a manual valve  
close-off operation, release the spindle one turn by  
turning the manual operator knob. This will ensure  
automatic disengagement of the manual operator  
upon power resumption.  
When the valve stem is up, the output signal is 0 or 2 Vdc. The  
output of the signal does not change when the action of the  
actuator is reversed using W3. See Direction of Action.  
Actuator Override  
To override the control signal (for freeze protection or similar  
applications), connect the 24 Vac common (T2) to either  
terminal O1 or O2. Connecting to terminal O1 fully extends the  
actuator stem. Connecting to O2 fully retracts the actuator  
stem.  
NOTE: If the manual operator knob is not pushed in while  
turned, it will rotate only a short distance before  
disengaging without power resumption.  
The control signal (+) is ignored when the override signal is  
applied to terminal O1 or O2. This override can be achieved  
with a switch or a relay. See Fig. 15.  
7
63-2533—03  
 
ML6420, ML7420 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS  
Direction of Action (ML7420/25 only)  
ML7420  
The direction of the actuator action can be changed using the  
pushbutton and LED, which is factory set so that the actuator  
drives the valve stem down on increasing signal and draws  
the valve stem up on decreasing signal. With the valve stem  
up, the output signal from the feedback (F) function is either 0  
or 2 Vdc. The output of the signal does not change when W3  
is used to reverse the actuator action. See Fig. 12.  
WIRING  
STRIP  
2
INPUT  
(FEEDBACK)  
OUTPUT  
F
F
+
+
3
T2  
T1  
O1  
O2  
SP3T  
OVERRIDE  
SWITCH  
4
1
L1  
(HOT)  
L2  
1
2
3
4
POWER SUPPLY. PROVIDE DISCONNECT MEANS  
AND OVERLOAD PROTECTION AS REQUIRED.  
2-10 Vdc FEEDBACK SIGNAL. SEE OUTPUT SIGNAL  
FEEDBACK SECTION.  
0-10Vdc OR 2-10 Vdc CONTROL SIGNAL. SEE SIGNAL  
INPUT (+) SECTION.  
SEE OVERRIDE SECTION FOR DETAILS ON  
OVERRIDE OPERATION.  
M17429  
Fig. 15. Connections for overriding control signal  
to drive ML7420 to a specific position.  
CHECKOUT  
The actuator can be checked out either directly or by using a controller.  
Direct Checkout  
Controller Checkout  
1. Mount the actuator for the required application; see  
Installation section.  
1. Adjust the setpoint of the controller to call for opening  
the valve. Observe the actuator.  
2. Check the valve position and make sure that 24 Vac is  
2. If the valve is closed, it should begin to open.  
3. If the valve remains closed, move the setpoint further  
toward the open setting.  
correctly applied to the actuator.  
3. Apply the power to the appropriate leadwires to move  
the valve.  
4. If the valve does not move, check for 24 Vac in the  
4. If the actuator does not move, make sure the actuator is  
properly installed/wired.  
5. If the actuator installation and wiring are both correct  
actuator power input.  
5. If 24 Vac is present and the actuator does not operate,  
check the voltage across the controller leadwires to  
determine if the device is miswired.  
and the actuator does not run, replace the actuator.  
6. If the wiring is correct, 24 Vac is present on the power  
input terminals, and the actuator does not run, replace  
the actuator.  
Automation and Control Solutions  
Honeywell International Inc.  
1985 Douglas Drive North  
® U.S. Registered Trademark  
© 2011 Honeywell International Inc.  
63-2533—03 M.S. Rev. 07-11  
Printed in U.S.A.  
Golden Valley, MN 55422  
customer.honeywell.com  
 

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