Cause : Inversion Detection (CLV/PM control mode only) comes when the torque reference and acceleration are in opposite directions and the speed reference and actual motor speed differ by more than 30% for the number of times set to F1-18.

1. The Z Pulse offset is not set properly to E5-11- set the value for Δθ to E5-11 as specified on the motor nameplate. Replacing the PG encoder or changing the application to rotate the motor in reverse requires readjustment of the Z-pulse offset. (T2-01 = 3)
2. An external force on the load side caused the motor to move
   • Make sure the motor is rotating in the proper direction.
   • Identify and fix any problems on the load side causing the motor to rotate in the opposite direction.
3. Noise interference along the PG cable affecting the A or B pulse. PG encoder is disconnected, improperly wired, or the PG option card or PG encoder are damaged - properly rewire the PG encoder and connect all lines including shielded line.
4. Rotational direction for the PG encoder set to F1-05 is the opposite of the motor line order- properly connect the motor lines for each phase (U, V, W).
5. The drive incorrectly detected the position of the motor poles.