168
Diagnostics and Troubleshooting
Problem Cause/Solution/Troubleshoot
Motor noise (squealing/
grinding sound), but not
vibration; does not affect ride
quality
Check whether the Sample Rate for Encoder (LF.29) is too high or too
low; 4-8ms is typical.
Check whether the setting for Encoder Multiplier Factor (LF.76) is
correct. For TTL incremental encoder, this value can only be set to
a value of 2; for absolute encoders (e.g. EnDat) typically found on
PM motors, the setting should be a value of 8.
Verify correct motor data. Re-enter as needed.
Perform a motor data learn if not yet completed.
Unable to run induction motor
in open loop.
For open loop induction motors, the Low Speed Torque Boost may need
to be decreased or increased.
Verify there are no mechanical issues preventing the motor from
rotating freely.
(Voltage) Modulation Grade
limit Reached
Verify correct wiring of the motor, in particular with motors which
have multiple voltage winding arrangements (eg. dual rated 230/460V
motors, wye-star/delta)
For induction motors, reduce the Field-Weakening Corner LF.16 to 60-
40% of synchronous speed (720-480 rpm for 6-pole/60 Hz motor).
For PM motor, check the current, particularly the peak current during
acceleration. Refer to Motor Draws High Current for additional
troubleshooting.
Reduce the acceleration and jerk rates into high speed.
Verify there is not excessive sag of the DC bus during acceleration.
Motor turns in the wrong
direction (both directions)
Inverter directions via LF.28. Note, do not change A-B settings (Not
inverted/Swap A-B) to invert direction.
For PM motors, do not change (U,V,W) motor phasing !
Clunk at end of run after
brake sets
Verify drive enable input is not being dropped prematurely while drive is
still outputting torque to motor.
To Next Page
Loading...
Need help?
General
