ML7284 NON-SPRING RETURN DIRECT COUPLED DAMPER ACTUATOR
63-2504—2
7
L1
(HOT)
L2
1
1
BROWN
WHITE
BROWN
WHITE
RED
BLACK
ML7284
ML7284
RED
BLACK
M7617A
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
PROPORTIONING
CONTROLLER
FEEDBACK
INPUT
FEEDBACK
INPUT
Fig. 8. Common transformer with one
controller output and two actuators.
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 ML7284 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. Standard mechanical connection is shown
in Fig. 4. See Fig. 5 for a typical wiring connection.
The ML7284 has a plastic housing with two tapped holes for
1/2 in. conduit fittings.
ML7284 Models with Factory-mounted Auxiliary
Switches (See Fig. 6)
ML7284C,F models have two nonadjustable low voltage rated
spdt auxiliary switches that are factory set to make common
to normally open at 12
°
and 82
°
rotation from the closed
(counter-clockwise) stop. See Fig. 6.
OPERATION
The ML7284 Non-Spring Return Direct Coupled Damper
Actuator is designed to be used in ventilating and air condi-
tioning installations to operate dampers, ventilation flaps and
louvers requiring up to 150 lb-in. torque.
The ML7284 Non-Spring Return Direct Coupled Damper
Actuator is operated by a proportional controller. When using
a proportional controller, the actuator is driven toward its
fully open position when the input signal increases and
toward the fully closed position when the input signal
decreases. The actuator stops when the input signal
reaches the desired proportional control point.
Use the rotation reversal slide switch to reverse the actuator
rotation. The switch is located on the side of the actuator
housing. See Fig. 9. To change the rotation to counter-
clockwise , change the slide switch. Example: In direct
position 2 volts is closed and 10 volts is open. In reverse
position 2 volts is open and 10 volts is closed.
M7830
30
30
0
60
60
90
12
12
ROTATION
REVERSAL
SWITCH
REVERSE
DIRECT
Fig. 9. Location of ML7284 rotation
reversal slide switch.