LINE SYNCRONIZATION FAULT

What does 903 mean?

The Phase Locked Loop (PLL) has lost synchronization with the 3-phase AC input power supply. This sets the Severe Fault flag, forces the DSD 412 current reference to zero, and shuts down the drive. This fault is generally caused by AC input power problems, is often self-correcting, and may occur in conjunction with an F904 fault. A CPU Reset is required.

• Problems with the 3-phase AC input power quality, such as voltage fluctuations or frequency deviations.

Click steps to track your progress.

1. 1

   Monitor the 3-phase AC input power supply for stability, voltage, and frequency variations.

2. 2

   Perform a CPU reset on the Drive Control PCB once the AC input power issues have been resolved.