Yaskawa Er-21: Z-phase pulse compensation fault

Yaskawa PLC & VFD Critical plc

Model: A1000 | Code: Er-21

Applicable Systems
GA700 GA500 A1000 V1000 J1000

Symptoms

Z-phase pulse compensation fault during autotuning.

Possible Causes

  • Motor data incorrect
  • Connection problem
  • Parameter conflict

Troubleshooting Steps

  1. Step 1: Check motor wiring and parameters, then rerun autotuning.
    Fault cleared after corrective action

How to Reset

Reset via operator keypad after resolving root cause.

Related Yaskawa Fault Codes

Source: Yaskawa A1000 Series Technical Manual (Alarm/Fault List), mirrored by gzjunkong.com & xuxingda.com

Category: PLC & VFD