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WARNING/ALARM 9 in danfoss VLT FCD300

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(@click2electro)
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Cause : Inverter overload comes when the frequency converter is about to cut out because of an overload (too high current for too long). The counter for electronic, thermal inverter protection gives a warning at 98% and trips at 100%, while giving an alarm.

  • The frequency converter cannot be reset until the counter is below 90%.
  • The fault is that the frequency converter is overloaded by more than 100% for too long.
  • Compare the output current shown on the LCP with the frequency converter rated current.
  • Compare the output current shown on the LCP with measured motor current.
  • Display the Thermal Drive Load on the LCP and monitor the value.
  • When running above the frequency converter continuous current rating, the counter should increase.
  • When running below the frequency converter continuous current rating, the counter should decrease.
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