Code

Name

Causes

Possible Solutions

STPo

Motor Step-Out Detected

The motor code is set incorrectly for PM Control Methods.

  • Set E5-01 [PM Motor Code Selection] correctly as specified by the motor.

  • For specialized motors, refer to the motor test report and set E5-xx correctly.

The load is too large.

  • Increase the value set in n8-55 [Motor to Load Inertia Ratio].

  • Increase the value set in n8-51 [Pull-in Current @ Acceleration]. If the drive detects STPo during deceleration when increasing the value set in n8-51, set the value of n8-79 [Pull-in Current @ Deceleration] lower than n8-51.

  • Decrease the load.

  • Replace the drive and motor with larger capacity models.

The load inertia is too large.

Increase the value set in n8-55.

The acceleration/deceleration times are too short.

  • Increase the values set in C1-01 to C1-08 [Acceleration/Deceleration Times].

  • Increase the value set in C2-01 [S-Curve Time @ Start of Accel].

Speed response is too slow.

Increase the value set in n8-55.
Note:

Do a Fault Reset to clear the fault.