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CoF fault code in yaskawa L1000A drive

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Cause : Current Offset Fault comes when the drive starts operation while the induced voltage stays in the motor (during coasting to a stop or after fast deceleration).

  1. Make a sequence that does not restart operation when induced voltage stays in the motor.
    • Set b3-01 = 1 [Speed Search at Start Selection = Enabled].
    • Use Speed Search from Fmax or Fref [H1-XX = 61, 62] to do a speed search through one of the external terminals. Note: When controlling the PM motor, External Speed Search commands 1 and 2 operate the same.
  2. A drive hardware problem occurred.
  3. Do a Fault Reset to clear the fault or de-energize the drive.
  4. If the fault stays, replace the drive.
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