BOOK0795-F
24
TROUBLESHOOTING
TABLE 6. TROUBLESHOOTING
INDICATION POSSIBLE CAUSE CORRECTIVE ACTION
1. Motor won’t start
(See “Inoperative
Motor,” page 18.)
AC line open
Be sure rated AC line voltage is applied to the
controller.
Operator controls inoperative or con-
nected incorrectly
Repair accordingly.
Open circuit between Connectors E1
and E2 in 1/6 - 3 HP controllers
A wire jumper or switch must connect E1 to
E2.
Controller not reset
Initiate a Stop command and then a Start com-
mand.
Line Voltage Selection Jumper J1 in
wrong position
See Step 5 on page 5 under, “Installing The
Controller.”
Controller not enabled
Be sure +24 VDC is applied to Terminal TB2-
8.
Loss of speed reference signal
Check for 0 - 10 VDC, 4 - 20 mA, or 0 - 5
VDC speed reference signal, as applicable.
Controller not adjusted correctly
Turn the ACCEL and CUR LIM potentiome-
ters fully clockwise (100%).
DIP Switch S3 not set correctly See Table 13, page 36.
Open shunt field winding or wiring to
the motor shunt field, causing loss of
torque
a
Check the motor shunt field and associated
circuitry for a loose connection or a broken
wire. Repair accordingly.
Motor failure Repair or replace the motor.
Control board failure Replace the control board.
2. Controller fuse blows
when AC line power is
applied to the controller
Wiring faulty or incorrect
Check all external wiring terminating in the
controller. Correct accordingly.
Circuit, component, or wiring
grounded
Remove ground fault.
Two or more SCR’s shorted Replace shorted SCR’s or the control board.
Varistor RV1 shorted Replace RV1 or the control board.
Shunt Field Bridge BR1 shorted
a
Replace BR1 or the control board.
Motor shunt field shorted or grounded
a
Repair or replace the motor.
Control board failure Replace the control board.
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