65
MOTOR SHORTNING
The motor controller indicates a short-circuit in
the motor windings, cabling or internally in the
motor controller.
If the power is on, be very careful when
working on the the machine.
Switch off the machine for at least 30 seconds to
ensure the motor controller has been completely
reset. Then try to start the machine again. If the
error returns, troubleshoot as follows:
1. Switch off the machine. Undo the contactor at X3 on
the motor. Use an ohmmeter to measure the resistance
towards the motor. Measure between 1-2, 1-3, and 2-3.
Resistance
SU620 4 ohm
SU630 2 ohm
SU645 1.2 ohm
SU660 0.8 ohm
SU677 0.8 ohm
Correct resistance One of the resistance values is
incorrect
The motor is probably
defective.
2. Inspect the cabling from X312 on the motor controller
to X3 on the motor. Use an ohmmeter and measure the
five leads as follows:
X312: 1 2 3 4 5
X3: 1 2 3 7 9 (X3:4 - 6, 8 not used)
Also measure the five leads to be sure there is no short-
circuit between any two leads.
Cabling OK Incorrect cabling
Inspect the cabling and replace
if necessary.
The motor controller output is defective.
37
Contactor X3, female towards motor
Measure resistance between
pins 1, 2 and 3
38
5181
X312
38
37
1
3
Troubleshooting
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