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UL6 alarm fault code in yaskawa FP605 drive

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Cause : Underload or Belt Break Detected comes when the output current decreased less than the motor underload curve set in L6-14 [Motor Underload Level @ Min Freq] for longer than the time set in L6-03 [Torque Detection Time 1].

  1. xThe belt has broken disconnecting the motor from the load.
  2. Examine parameters L6-13 [Motor Underload Curve Select] and L6-14.
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