10 Troubleshooting
10.7AC interface drive problems and solutions
Page 90 Docu-No.: 1090020601-EN Rev. 1.2.1
10.7 AC interface drive problems and solutions
Note
• Before you change one of the programming variables, check the
parameter against standards.
Problem Possible Cause Remedy
Motor does not start. • No setpoint from KCM.
• Safety switch is active.
• Motor cable has been disconnected.
• Failed motor.
• Contactor failed.
• F1 or F2 fuses have failed.
• AC drive has failed.
Enter setpoint at operating unit.
Check safety switch on the feeder
or its connection at KCM.
Check motor cables.
Replace motor.
Check for alarms that might stop
the machine.
Check display status for <Wait>,
<Disa>, <Alsh>.
Check that KCM has power.
Verify contactor is functional, if
used.
Check F1 and F2 on AC interface
drive pcb.
Replace AC drive.
Motor runs at
maximum speed.
• Speed sensor has failed.
• If scale interface pc board (SIB) is
used, the SIB has failed.
• Setpoint is too high.
Check signal, replace sensor.
Check signal, if pick-up is OK, and
SIB is used, replace SIB.
If signals are OK, replace KCM.
Reduce setpoint.
Motor does not
achieve desired
speed.
• Incorrect motor power setting.
• Incorrect gear teeth setting.
• AC drive incorrectly programmed.
Check programming.
Alv LED is <Off> • No AC power to drive
• AC Interface Drive pcb has failed
Check input power for proper
connections.
Replace AC Interface drive.
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