DC OVERVOLT

What does 3210 mean?

An excessive DC voltage has been detected in the intermediate circuit of the drive. The DC overvoltage trip limit is calculated as 1.3 × 1.35 × U1max, which corresponds to 728 VDC for 400 V units, 877 VDC for 500 V units, and 1210 VDC for 690 V units. This fault is associated with bit 2 of Fault Word 1 (3.05 FW 1).

• DC bus voltage is excessively high.
• Regenerative braking not functioning correctly.
• Line voltage too high causing DC bus overvoltage.
• Capacitor bank failure in the DC bus.

Click steps to track your progress.

1. 1

   Verify that the overvoltage controller function is enabled by checking parameter 20.05.

2. 2

   Measure the incoming AC supply voltage for any static or transient overvoltage conditions that exceed nominal limits.

3. 3

   Inspect the brake chopper and its associated resistor (if installed) for proper functionality and wiring.

4. 4

   Increase the deceleration time parameter in the drive settings to allow for a slower deceleration of the motor.

5. 5

   If applicable, enable the coast-to-stop function to allow the motor to freely decelerate without regenerative braking.

6. 6

   Consider installing or retrofitting a brake chopper and brake resistor if the application experiences frequent overvoltage trips during deceleration.