HF damping module: Damping voltage too high

What does 237502 mean?

This alarm indicates that the damping voltage in the HF damping module has exceeded its alarm threshold. This can happen if a motor harmonic with high amplitude coincides with the resonance frequency of the output filter or if the current controller excessively excites the output filter's resonance. If the damping voltage continues to rise to an unacceptably high level, it will escalate to fault F37002. High damping voltage can lead to component stress, reduced lifespan, and potential failure of the damping module or related components.

• Motor cable length exceeding the maximum permissible length for the drive and damping module combination (e.g., >150 meters without additional filtering).
• Motor switching frequency (e.g., P1800 parameter) set too high, exciting resonance in the motor cable and causing voltage peaks.
• High amplitude harmonic currents generated by the motor or load (e.g., due to specific mechanical resonance) coinciding with the damping module's resonance frequency.
• Incorrectly configured damping module parameters (e.g., P0250) for the connected motor and cable setup.
• Internal fault within the HF damping module itself, leading to erroneous voltage regulation or measurement.

Click steps to track your progress.

1. 1

   Verify the motor cable length against the manufacturer's recommendations for the specific drive and damping module combination.

2. 2

   Reduce the drive's pulse frequency (P1800 parameter) by one step (e.g., from 8 kHz to 4 kHz) and observe if the damping voltage (r0251) decreases.

3. 3

   Analyze the output voltage and current waveforms at the motor terminals (U, V, W) using an oscilloscope to identify harmonic content and resonance.

4. 4

   Check the damping module configuration parameters (e.g., P0250, P0251) and compare them with the recommended values for the application from the manual.

5. 5

   Measure the damping voltage directly at the specified test points of the HF damping module to confirm the accuracy of the internal measurement (r0251).