DC link overvoltage

What does 3210 mean?

The DC link voltage within the drive has exceeded its safe operating limit. This commonly occurs due to regenerative energy from the motor (e.g., during rapid deceleration) that cannot be dissipated, or an excessive input supply voltage. Prolonged overvoltage can damage the drive's internal components.

• Rapid deceleration of high inertia loads without an adequate braking resistor or regeneration capacity.
• Braking chopper transistor failure (shorted or open) preventing the dissipation of regenerative energy into the resistor.
• Braking resistor open-circuited, incorrect resistance value, or disconnected from terminals BR1, BR2, disabling energy dissipation.
• Incoming AC supply voltage consistently above the drive's maximum input voltage rating (e.g., 480V supply exceeding 500V peak DC link).
• Parameter P22.02 (Deceleration Time 1) set too short for the application's inertia and braking capability.

Click steps to track your progress.

1. 1

   1. Monitor DC link voltage (e.g., from drive display or P01.07) during deceleration phases to observe peak voltage.

2. 2

   2. Verify braking resistor connection to terminals BR1, BR2 and measure its resistance value with a multimeter to ensure it matches the drive's specification. Replace if open or incorrect.

3. 3

   3. Increase deceleration time parameter P22.02 (Deceleration Time 1) by 25-50% to reduce the rate of regenerative energy generation.

4. 4

   4. Check incoming AC supply voltage at drive input terminals L1, L2, L3 using a multimeter. Confirm it is stable and within the drive's specified operating range (e.g., 380V-480V RMS).

5. 5

   5. Inspect the braking chopper circuit (if applicable, integrated or external braking unit) for visible damage, blown fuses, or fault indicators.