Yaskawa CoF: Current observer abnormal

Yaskawa Electrical Fault vfd

Model: GA700/A1000 | Code: CoF

Applicable Systems
GA700 GA500 A1000 V1000 J1000

Symptoms

Current observer abnormal

Possible Causes

  • Motor residual induced voltage during free-run or rapid deceleration restart
  • Drive hardware fault

Troubleshooting Steps

  • Set sequence to prevent restart with motor residual voltage; set b3-01=1 speed search
  • Reset fault or power cycle; if persistent, replace drive

How to Reset

Reset by: 1) Correct the fault condition. 2) Press RESET button on operator panel. 3) Verify fault does not recur.

Related Yaskawa Fault Codes

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Source: Yaskawa GA700 Fault Code Manual (jinxinservice.com)

Category: Electrical