Code

Name

Causes

Possible Solutions

oS

Overspeed

There is overshoot.

  • Decrease C5-01 [ASR Proportional Gain 1] and increase C5-02 [ASR Integral Time 1].

  • Use H6-02 to H6-05 [Pulse Train Input Setting Parameters]to adjust the pulse train gain.

There is an incorrect number of PG pulses set in the drive.

Set H6-02 [Terminal RP Frequency Scaling] to the pulse train frequency during 100% reference (maximum motor rotation speed).

The oS detection level is set incorrectly.

Adjust F1-08 [Overspeed Detection Level] and F1-09 [Overspeed Detection Delay Time].

If the drive detects the fault at start or in the low speed range (10% or less) and n8-57 = 1 [HFI Overlap Selection = Enabled] for PM Control methods, the high frequency injection gain is too high.

  • Set E5-xx [PM Motor Parameters] correctly or do Rotational Auto-Tuning.

  • Decrease the value of n8-41 [HFI P Gain] in 0.5 unit increments.

    Note:

    Set n8-41 > 0.0 for IPM motors.
Note:

  • The drive detects this fault if the motor speed is more than the value set in F1-08 for longer than F1-09.

  • Do a Fault Reset to clear the fault.

  • If the drive detects this fault, it will operate the motor as specified by the Stopping Method set in F1-03 [Overspeed Detection Selection].