DC HIGH RUSH
ABB · ACS800
What does FF80 mean?
The ABB ACS800 drive's supply voltage is excessive, exceeding 124% of the unit's voltage rating (e.g., 415V, 500V, or 690V). When this occurs, the motor speed can rush to a trip level (40% of nominal speed), indicating a potentially damaging overvoltage condition on the DC link.
Common Causes
- Excessive AC supply voltage from the mains input.
- The drive is connected to an incorrect supply voltage rating that is higher than its nominal input.
- Voltage transients or spikes on the supply line that temporarily exceed the drive's limits.
- Malfunction in the drive's input rectifier stage allowing overvoltage.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Measure the incoming AC supply voltage at the ABB ACS800 drive input terminals (L1, L2, L3) and verify it is within the drive's specified nominal voltage range and allowable tolerance.
- 2
Compare the measured supply voltage to the drive's rated voltage (e.g., 415V, 500V, or 690V) as indicated on the drive's nameplate.
- 3
Check for any external power quality issues, such as severe voltage swells or transients, that might be causing transient overvoltage conditions.
- 4
Ensure the drive unit matches the intended supply voltage for the installation; a mismatch can lead to chronic overvoltage.
- 5
Consider installing line reactors or a dV/dT filter on the input to mitigate voltage transients if power quality is problematic.