Troubleshooting

Servo drive problems occur for a variety of reasons, depending on the conditions in your installation. If you cannot resolve a fault or other issue using the troubleshooting guidance presented below, customer support can give you further assistance.

Eliminate errors and faults in compliance with work safety rules. Troubleshooting only by qualified and trained staff.

More details on the removal of faults see Fault and Warning Messages can be found in the WorkBench User Manual.

 

Problem

Possible Causes

Remedy

HMI message:
Communication fault
  1. wrong cable used, cable plugged into wrong position on servo drive or PC
  2. wrong PC interface selected
  1. plug cable into the correct sockets on the servo drive and PC
  2. select correct interface

Drive does not enable
  1. HW Enable configured but not wired
  2. HW or SW Enable not set
  1. connect HW Enable to the selected input
  2. Apply 24V to HW Enable and select SW Enable in WorkBench / Fieldbus

Motor does not rotate
  1. servo drive not enabled
  2. software enable not set
  3. break in setpoint cable
  4. servo motor phases swapped
  5. brake not released
  6. servo drive is mechanically blocked
  7. servo motor pole no. set incorrectly
  8. feedback set up incorrectly
  1. apply ENABLE signal
  2. set software enable
  3. check setpoint cable
  4. correct servo motor phase sequence
  5. check brake control
  6. check mechanics
  7. set servo motor pole no.
  8. set up feedback correctly

Motor oscillates
  1. gain is too high (speed controller)
  2. feedback cable shielding broken
  3. AGND not wired up
  1. reduce AXIS#.VL.KP (speed controller)
  2. replace feedback cable
  3. join AGND to CNC-GND

Drive reports
following error
  1. Irms or Ipeak set too low
  2. current or velocity limits apply
  3. accel/decel ramp is too long
  1. verify servo motor/drive sizing
  2. verify that AXIS#.IL.LIMITN/P, AXIS#.VL.LIMITN/P are not limiting the servo drive
  3. reduce AXIS#.ACC/AXIS#.DEC

Motor overheating
  1. servo motor operating above its rating
  2. servo motor current settings incorrect
  1. verify servo motor/drive sizing
  2. verify servo motor continuous and peak current values are set correctly

Drive too soft
  1. AXIS#.VL.Kp (velocity) too low
  2. AXIS#.VL.Ki (velocity) too low
  3. filters set too high
  1. increase AXIS#.VL.KP (velocity)
  2. increase AXIS#.VL.KI (velocity)
  3. refer to documentation regarding reducing filtering (AXIS#.VL.AR*)

Drive runs roughly
  1. AXIS#.VL.Kp (velocity) too high
  2. AXIS#.VL.Ki (velocity) too high
  3. filters set too low
  1. reduce AXIS#.VL.KP (velocity)
  2. reduce AXIS#.VL.KI (velocity)
  3. refer to documentation regarding increasing filtering (AXIS#.VL.AR*)