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Operation Problems
Problem Cause/Solution/Troubleshoot
Motor Draws High Current 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
(Diagnostic Screen #12). Refer to the text 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 LE06 Encoder Pole Position value and re-
learn as needed. Refer to Encoder slippage/mounting (PM motors)
for additional information.
For PM motors, the encoder channel A/B phasing (LE03 Swap
Encoder Channels) must be correct and the encoder/rotor position
learned with the correct setting. The correct A/B phasing can be
determined by the LL07 Encoder Synchronization procedure.
For induction motors, set LC01 Control Mode to Open Loop V/Hz to de-
termine 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.
Verify the brake picks and does not drag and that there are no
other mechanical issues preventing the motor from rotating freely.
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