172
Diagnostics and Troubleshooting
Item # Check/Solution
Encoder/Motor Pole Position
Incorrect
For PM motors, the absolute encoder position indicates is used to
properly indicate the position of the rotor. If the connection of the
encoder to the motor shaft changes (removed/replaced, slippage, etc.),
the absolute encoder position relative to the motor poles is no long
valid and will require the position to be relearned. If the LF.77 Encoder
Pole Position has changed by more than 2,000 from the previous
value, this indicates a change in physical position relation of the
encoder to the rotor, generally due to encoder slippage over time
(potentially distance or change in direction as well), mounting
issues, or mechanical aspects.
When the encoder/motor pole position is incorrect, the motor will tend
to draw high current, hitting the 0.LF.36 Maximum Torque setting or
Inverter Peak Current Limit, and tending to stall or only move in the
direction of weighting.
Motor Data Incorrect Check the motor data against the nameplate values and perform a
Motor Autotune LF.30= S Lrn if not previously completed.
For PM motors, ensure the relationship between the motor rated speed,
motor rated frequency and number for motor poles is correct in case of
any nameplate rounding. Refer to section 5.6.2 for further details.
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