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UL4 alarm code in yaskawa V1000 drive

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Cause : Undertorque Detection 2 comes when drive output current (or torque in OLV, CLV, AOLV/PM, and CLV/PM) less than L6-05 for longer than L6-06 time.

  1. Inappropriate parameter settings.
  2. Check parameters L6-05 and L6-06.
  3. The load has dropped or decreased significantly.
  4. Check for broken parts in the transmission system.
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