Honeywell ml7420 User Manual
ML6420, ML7420 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS
63-2533—03
4
Fig. 2. Attaching actuator to valve collar.
Fig. 3. Securing actuator to valve.
Fig. 4. Removing actuator cover.
Wiring
CAUTION
Electrical Shock or Equipment Damage Hazard.
Can shock individuals or short equipment circuitry.
Disconnect power supply before installation.
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.
5. Apply power and control signals to the actuator.
Fig. 5. Connecting power and control wiring.
Fig. 6. ML6420 wiring.
M6632
M6633
M17420
M6630
WIRING
STRIP
T1
T2
T2
W
B
1
L1
(HOT)
L2
L2
T
Y
Y
G
ML6420A,B
2
4
3
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.
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.
MOTOR OPEN SIGNAL DRAWS VALVE STEM
UPWARDS. MOTOR CLOSE SIGNAL DRIVES
VALVE STEM DOWNWARDS.
1
2
3
4
T6984 (FLOATING CONTROLLER)
M32766
MOTOR OPEN
MOTOR CLOSE
MOTOR CLOSE
COMMON
24 Vac
O