DC Bus High Rush

What does FF80 mean?

The drive supply voltage is excessive, exceeding 124% of the unit's nominal voltage rating (e.g., >415V, >500V, or >690V). This overvoltage condition causes the motor speed to rapidly increase, rushing to a trip level of 40% of nominal speed, indicating a potentially dangerous power supply condition.

• Excessive inrush current detected when powering up the drive.
• Faulty pre-charge resistor or contactor preventing proper inrush current limiting.
• Line voltage fluctuations causing high initial current draw.
• Short circuit on the output stage of the drive.

Click steps to track your progress.

1. 1

   Measure the incoming AC supply voltage level at the drive input terminals to verify it is within the allowed range.

2. 2

   Verify the drive's rated voltage matches the actual supply voltage and that the supply voltage falls within the drive's allowed operational voltage range.