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TROUBLESHOOTING
INDICATION
1. Motor won't start
(See "Inoperative
Motor," page 21)
2. Controller line fuse
blows when AC line
power is applied to the
controller
Cont'd on next page
TABLE 6. TROUBLESHOOTING
POSSIBLE CAUSE
AC line open
Operator controls inoperative or con-
nected incorrectly
Open circuit between Connectors E1
and E2
Controller not reset
Line Voltage Selection Jumper J1 in
wrong position
Controller not enabled
Loss of speed reference signal
Controller not adjusted correctly
Open shunt field winding or wiring to
the motor shunt field, causing loss of
a
torque
Motor failure
Control board failure
Wiring faulty or incorrect
Circuit, component, or wiring
grounded
SCR1, SCR2, SCR3 or SCR4 shorted
Bridge Diode D1b shorted
Varistor RV1 shorted
Shunt Field Diode D39, D40, D41, or
a
D42 shorted
Motor shunt field shorted or grounded
Control board failure
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CORRECTIVE ACTION
Be sure rated AC line voltage is applied to the
controller.
Repair accordingly.
A wire jumper or switch must connect E1 to
E2.
Initiate a Stop command and then a Start com-
mand.
See Step 5 on page 5 under, "Installing The
Controller."
Be sure +24 VDC is applied to Terminal TB2
8.
Check for 0 - 10 VDC speed reference signal.
Turn the ACCEL and CUR LMT potentiome
ters fully counterclockwise (100%).
Check the motor shunt field and associated
circuitry for a loose connection or a broken
wire. Repair accordingly.
Repair or replace the motor.
Replace the control board.
Check all external wiring terminating in the
controller. Correct accordingly.
Remove ground fault.
Replace shorted SCR's or the control board.
Replace shorted diode or the control board.
Replace RV1 or the control board.
Replace shorted diode or the control board.
a
Repair or replace the motor.
Replace the control board.
25
BOOK 0958-B
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