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Diagnostics and Troubleshooting
Problem Cause/Solution/Troubleshoot
Motor Draws High Current Verify the brake picks and does not drag and that there are no
other mechanical issues preventing the motor from rotating freely.
Verify correct motor data.
For PM motors, verify the correct relationship between the Motor
Rated Speed, Motor Rated Frequency and the number of motor poles
Refer to Section 5.6 for further description.
Perform a Motor Learn if this has not already been completed.
For PM motors, verify the encoder/motor pole position is correct.
Make note of the present LF.77 Encoder Pole Position value and
relearn as needed. Refer to Encoder slippage/mounting (PM
motors) for additional information.
For PM motors, the encoder channel A/B phasing (LF.28 Swap
Encoder Channels) must be correct and the encoder/rotor position
learned with the correct setting.
For induction motors, set LF.30 Control Mode to Open Loop V/Hz to
determine if the issue is due to encoder, encoder settings or speed
control settings.
For open loop induction motors, the Low Speed Torque Boost may need
to be decreased or increased.
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