DC link voltage high

What does 5 mean?

The intermediate circuit voltage (DC) has risen above the high-voltage warning limit, which is dependent on the frequency converter's voltage rating. The unit is still active, but operating at an elevated voltage could stress internal components or lead to a trip if limits are exceeded.

• Incoming AC mains supply voltage exceeding the nominal rating of the frequency converter (e.g., >480V for a 400V drive).
• High regenerative energy feedback from the motor during rapid deceleration, without a braking resistor or dynamic braking module.
• Malfunctioning or incorrectly sized external braking resistor, preventing sufficient energy dissipation.
• Deceleration ramp times (e.g., P3-42, P3-43) set too short for the motor's inertia and load dynamics.

Click steps to track your progress.

1. 1

   Measure the incoming AC mains voltage at terminals L1, L2, L3 to verify it is within the frequency converter's specified operating range.

2. 2

   Increase the deceleration ramp time in parameter P3-42 (Ramp Down Time 1) or P3-43 (Ramp Down Time 2) to reduce regenerative energy generation.

3. 3

   Verify the braking resistor connection (terminals 81, 82) and measure its resistance (in Ohms) to ensure it matches the drive's specifications.

4. 4

   Inspect the braking chopper circuit for proper function; measure voltage across braking resistor terminals (81, 82) during deceleration (power ON).