Power section – Fault

What does F23.2 mean?

A standard fault has been detected in the power section, resulting in an emergency stop and output stage inhibit. This signifies a critical problem preventing safe operation and demands immediate attention to prevent further damage to the drive components.

• Failure of one or more IGBTs (Insulated Gate Bipolar Transistors) in the inverter bridge.
• Overvoltage or undervoltage condition in the DC link exceeding protective limits (e.g., due to regeneration or supply issues).
• Short circuit or ground fault detected within the power section itself, separate from motor leads.
• Failure of the gate driver circuitry responsible for switching IGBTs.
• Damaged current sensors providing erroneous feedback from the output stage, leading to false tripping.

Click steps to track your progress.

1. 1

   Disconnect main power. Perform a visual inspection of the entire power section for burnt components, discoloration, or evidence of arcing.

2. 2

   Use a multimeter to test the resistance between each output phase (U, V, W) and the DC- link/DC+ link to check for internal short circuits (after discharging DC bus).

3. 3

   Check the DC link voltage measurement (e.g., Parameter P7-01) immediately after the fault occurs to identify over/under voltage conditions.

4. 4

   Verify proper functioning of the cooling system, including fan operation and clear heatsink fins.

5. 5

   If feasible and safe, disconnect the motor and perform a no-load test to determine if the fault is internal to the drive or motor-related.