Infeed: Line phase failure

What does 206200 mean?

One or several line phases have failed, or an overvoltage condition has persisted, causing the infeed to fault. This can occur during power-on if the PLL cannot synchronize due to incorrect phase assignment (e.g., with a VSM) or during operation after a significant voltage dip or overvoltage. Alarm A06205 usually precedes this fault, providing additional diagnostic information.

Complete Troubleshooting Guide

1. 1

   Inspect the incoming line supply for physical phase loss, significant voltage dips, or overvoltages that last longer than 10 ms.

2. 2

   Verify the correct phase assignment (L1, L2, L3) at the Voltage Sensing Module (VSM) and ensure it matches the assignment at the power unit.

3. 3

   Check for an overload condition on the load side that could cause peak currents, potentially leading to this fault condition.

4. 4

   Ensure the commutating reactor is present, correctly installed, and properly functioning, as its absence can contribute to this issue.

5. 5

   Refer to Alarm A06205 if it was triggered, as its warning value can provide crucial information regarding the cause of the line supply fault.