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WARNING/ALARM 7 in danfoss VLT FCD300

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(@click2electro)
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Cause : DC overvoltage comes when the intermediate circuit voltage exceeds the limit, the frequency converter trips after a time.

  1. If the intermediate voltage (UDC) goes over the inverter's Overvoltage limit, the inverter will be switched off until the UDC has once more fallen below the overvoltage limit.
  2. If the UDC remains above the overvoltage limit, the inverter will trip after a set time.
  3. The time depends on the device and is set at 5-10 sec.
  4. An overvoltage in the UDC can occur when the motor frequency is reduced too quickly due to ramp-down time being too short.
  5. Note: Voltage warning high (warning 5) will thus also be able to generate an alarm 7
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