LV4-Trip (Undervoltage in intermediate circuit while charging, 500 V threshold not reached)

What does 124 mean?

This fault indicates an undervoltage condition in the intermediate DC bus circuit during charging, specifically failing to reach the 500V threshold (KPS-600). This suggests an issue with the incoming mains supply or the rectifier section, preventing the DC bus from charging adequately for operation.

1. 1

   Measure the incoming AC mains voltage at the drive input terminals.

2. 2

   Measure the DC bus voltage at terminals +UDC/-UDC during the charging attempt.

3. 3

   Verify the integrity of the rectifier section of the drive for any component failures.