PCU LOOP FAULT

What does 900 mean?

The contactor did not close or opened unexpectedly, or the motor voltage exceeded 30% of rated motor voltage #7 during Self-Tune #997. This fault sets the Severe Fault flag and forces the DSD 412 current reference to zero, leading to a drive shutdown.

• Contactor auxiliary feedback circuit issue to TB1-7.
• Contactor or LPR (Line Power Relay) coils not operating properly.
• Loss of power to LPR from the power supply at TB3-5 (this will be momentary until F900 occurs).
• Internal relay failure if no power is detected at TB3-5.

Click steps to track your progress.

1. 1

   Check the contactor auxiliary feedback circuit to TB1-7.

2. 2

   Check contactor and LPR coils for proper operation.

3. 3

   Verify power is being applied to LPR from the power supply at TB3-5.

4. 4

   If no power at TB3-5, replace the A4 Power Supply PCB, as an internal relay failure is suspected.