172Diagnostics and TroubleshootingItem # Check/SolutionEncoder/Motor Pole PositionIncorrectFor PM motors, the absolute encoder position indicates is used toproperly indicate the position of the rotor. If the connection of theencoder to the motor shaft changes (removed/replaced, slippage, etc.),the absolute encoder position relative to the motor poles is no longvalid and will require the position to be relearned. If the LF.77 EncoderPole Position has changed by more than 2,000 from the previousvalue, this indicates a change in physical position relation of theencoder to the rotor, generally due to encoder slippage over time(potentially distance or change in direction as well), mountingissues, or mechanical aspects.When the encoder/motor pole position is incorrect, the motor will tendto draw high current, hitting the 0.LF.36 Maximum Torque setting orInverter Peak Current Limit, and tending to stall or only move in thedirection of weighting.Motor Data Incorrect Check the motor data against the nameplate values and perform aMotor 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 ofany nameplate rounding. Refer to section 5.6.2 for further details.
