DC OVERVOLT
ABB · ACS800
What does 3210 mean?
Excessive intermediate circuit DC voltage has been detected in the ABB ACS800 drive. The DC overvoltage trip limit is calculated as 1.3 × 1.35 × U1max, where U1max is the maximum supply voltage. For a 400V unit (U1max = 415V), the trip level is 728V DC; for 500V units (U1max = 500V), it's 877V DC; and for 690V units (U1max = 690V), it's 1210V DC.
Common Causes
- Regenerative energy from the motor during deceleration, especially with high inertia loads or short deceleration times.
- Static overvoltage or transient voltage spikes on the main supply line.
- Malfunction or incorrect sizing of the brake chopper and brake resistor (if installed).
- Deceleration time parameter set too short for the application's inertia.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Check that the overvoltage controller is enabled (Parameter 20.05).
- 2
Check the supply voltage for static or transient overvoltage conditions using a multimeter or power quality analyzer.
- 3
If used, check the brake chopper and brake resistor for proper operation, sizing, and connections.
- 4
Increase the deceleration time (e.g., parameter 22.03) to allow for a slower stop, reducing regenerative energy.
- 5
Consider implementing a coast-to-stop function (if applicable) to allow the motor to freewheel to a stop.
- 6
Retrofit the frequency converter with a brake chopper and brake resistor if not already present and necessary for the application to dissipate regenerative energy.