SERIES 71, 72, AND 76 MODUTROL IV MOTORS
11
63-264008
Fig. 12. Auxiliary switch adjustment.
OPERATION AND CHECKOUT
Operation
The internal shaft position feedback potentiometer in
conjunction with the actuator microprocessor and modulating
input circuit form a control loop. When the external controllers
output remains at a fixed amplitude the actuators shaft position
is held at a position proportional to that input amplitude. When
the value of the external controllers output changes the
actuator responds by initiating movement of the motor to
proportionately compensate for the change in input amplitude.
When the motor reaches the control loop balance point the
system is again in a static state and the actuator holds position
until the next change of input from the external controller.
M7685 motor also have a minimum position feature. An
external 130 ohm potentiometer wired to terminals 3 and 4
establishes a position beyond which the control input cannot
close the motor. If power to the T1-T2 is interrupted the M7685
motor will spring close.
Checkout
After installation and linkage adjustment, operate the motor
through the controller. Make sure that:
The motor properly operates the damper or valve.
The motor responds properly as the input is varied.
The auxiliary switch, if used, operates at the desired point of
motor rotation.
Inspect the motor, linkage, and valve or damper to see that all
mechanical connections are correct and secure.
In damper installations, the pushrod should not extend more
than a few inches past the ball joints. Check to see that there is
adequate clearance for the linkage to move through its stroke
without binding or striking other objects.
See controller or system instructions for additional checkout
procedures.
Motor Operation Checkout
For motors with F, + and - terminals:
To close the motor, open ter, -, and F.
To open the motor connect terminal F to positive (+) or
negative (-).
NOTE: DO NOT SHORT + to -
M7164A1017 and M7164G1030 do not have + or
terminals, and operate as follows:
The motor closes if it does not receive an input to F.
To open the motor, short F to C.
M7685A1025 is a normally open motor, and operates as
follows:
To close the motor, short 3 to 4 or short 3 to C.
The motor opens if it does not have an input to 3.
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