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WIRING SCHEMATICS
MLx984 actuators are designed to operate from a Safety Extra Low Voltage, Class II power source. A 7/8" wiring hole is provided for
attaching flexible conduit where required by local codes. When installing outdoors, weatherproof conduit fittings approved for outdoor
and wet locations must be used.
!
Caution
Electrical Shock or Equipment Damage Hazard. Can Shock Individuals or Short Equipment Circuitry.
Disconnect power supply to the actuator to prevent electrical shock and equipment damage, or remove and cap the air line to the
actuator.
!
Note
In all cases when wiring multiple actuators, the power supply to all actuators must be connected in a "star" fashion to reduce exces-
sive voltage drop. DO NOT "daisy chain" i.e. connect power to one actuator then branch to another.
Operation:
The recommended valve actuator power source is a Safety Extra-Low Voltage (SELV) Class II, 24 V transformer or regulated 28 Vdc
across terminals T5 & T6. Internal circuitry provides dc power for the electronic sensing and drive motor circuits.
Typical Electro-mechanical
2
L1
1
24 Vac
L2
FIG. 8A — 3-WIRE CONTROL OF ML6984 WITH
SERIES 60 CONTROLLER
2
L1
1
L2
FIG. 8B — 3-WIRE CONTROL OF ML6984 WITH XL10
ELECTRONIC CONTROLLER
For Figures 8A, 8B, and 8C the following apply:
1
Power supply provides overload protection and disconnect means.
Allow up to 0.5 amps for each device. Actuators and controller can share same transformer, provided that the VA rating of the
2
transformer is not exceeded and proper phasing is observed. Do not mix a.c. and d.c. power sources.
Controller can be low voltage SPDT Series 20 "on-off" or SP3T Series 60 "floating" (tri-state) type. Terminals R and T5 are
3
connected inside the ML6984.
Multiple actuators controlled by a common controller in parallel must be wired so that they all travel in the same direction.
4
Reverse acting actuators will NOT operate reliably in combination with direct acting units due to gearbox tolerances. Use
ML7984 modulating actuators, or dedicated controllers, or separate controller outputs for each group instead.
5
5-wire installation is required with the 272630D position feedback/auxiliary switch module.
ML6984
Controller
W
T6
R
W
R
B
T5
B
Typical Electronic
ML6984
Controller
1
C
W
H
R
3
3
3
Typical SPDT Controller
W
R
B
3
T6
T5
B
FIG. 8C — 5-WIRE CONTROL OF ML6984
5
4
2
ML6984
W
T6
24 Vac
R
T5
B
T6
4
T5
ML6984
W
T6
R
T5
B
95C-10939-4
L1
1
L2
OR
28 Vdc
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