10 Troubleshooting
10.6Stepper drive problems and solutions
Page 88 Docu-No.: 1090020601-EN Rev. 1.2.1
10.6 Stepper drive problems and solutions
Note
• Before you change one of the programming variables, check the
parameter against standards.
Fault Possible Cause Remedy
Motor does not run.
Alarm LED is <Off>.
• No setpoint from KCM.
• No Drive Enable signal.
• Safety switch is open.
• No AC power.
Enter operating setpoint. Press
<Start>.
Check for Drive Enable signal now.
Check safety switch input.
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.
Motor does not run.
Alarm LED is <On>.
• Motor cable fault.
• Motor short.
• Motor is overloaded.
Check motor cable and motor.
Check reason for motor overload
and correct.
Motor does not
reach desired speed.
• Inadequate motor power
• Setpoint is too high.
• Motor speed not smooth.
Check load on motor.
Verify motor power programming
against label on stepper motor.
Reduce setpoint.
Alarm LED indicates
over temperature
• Load is too high
• Ambient temperature is too high
Reduce motor load.
Reduce operating temperature.
Alv LED is <Off> • No AC power to stepper drive
• Stepper drive has failed
Check input power for proper
connections.
Replace stepper drive.
Alarm LED is
blinking a specified
count
• Various internal or external
problems to the stepper drive are
evident
See service specific information at
section 10.6.1.
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