5.
INITIAL TURN-ON PROCEDURE
Recheck all wiring. Accidental grounds on any of the motor leads or speed
potentiometer wires may damage the unit when power is applied. Make sure
that the AC service is of the correct voltage, as indicated by the voltage
warning label located on the control.
Before applying power, check to make sure the feedback select jumper on
2PL is in the “Arm” position, pins 1 and 2 on 2PL jumpered together, for
controls using armature voltage feedback. On controls that will use
tachometer feedback, refer to the Tachometer Feedback Section 14 in this
manual.
Turn the speed potentiometer to zero. Apply power from the AC disconnect
switch (S1 on enclosed controls). An LED located on the PC board will light
indicating power is applied. ( In contactor operated systems, also energize
the DC contactor.) Slowly advance the speed potentiometer while observing
the motor. If motor rotation is incorrect, turn power off at the AC disconnect
and reverse the A1 and A2 connections to terminals A1 and A2 on 10TB of
the OC2-500 control. If the motor runs at maximum seed with the
potentiometer fully counterclockwise, and slows down as the potentiometer
is rotated clockwise, the potentiometer is wired in backward. With power
off, reverse the outer leads of the speed potentiometer.
The control should be checked for satisfactory operation throughout the
entire speed range. If instability is observed, maximum speed is higher than
normal, or if acceleration time is not as desired, adjust the control as
described in the following section. If initial operation is satisfactory, no
readjustments are necessary.
6.
ADJUSTMENTS
Five internal adjustments are provided.
a)
Minimum speed (“MIN”)
b)
Maximum speed (“MAX”)
c)
IR (load) compensation (“IR”)
d)
Torque Limit (“TORQ”)
e) Acceleration
(“ACC”)
The function of these adjustments is described in Table II.
All adjustments, except “IR”, are preset at the factory. A ‘typical’ test motor
is utilized. The “MAX” and “TORQ” adjustments do not depend on
individual motor characteristics and therefore should be correct as received.
The “IR” and “MIN” adjustments, however, are somewhat dependent on
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