Infeed: Line supply undervoltage shutdown

What does 206100 mean?

The infeed unit has shut down because the filtered, steady-state value of the line supply voltage has dropped below the fault threshold defined by p0283. The fault value (r0949) indicates the current line supply voltage. This condition triggers an OFF2 (or OFF1) reaction, stopping the drive.

• Severe voltage sag on the incoming AC line supply (e.g., due to utility issues, upstream transformer overload, large motor starts on the same line).
• Incorrectly set undervoltage threshold parameter P0283 (Minimum DC link voltage) which is too high for the actual line conditions.
• Line reactor (e.g., L_line) or filter components on the infeed unit are faulty or undersized, leading to excessive voltage drop.
• Loose or corroded connections in the main power circuit (e.g., circuit breaker terminals, contactor terminals, infeed power terminals X1/L1/L2/L3).
• Infeed module internal hardware fault in the voltage sensing circuit.

Click steps to track your progress.

1. 1

   1. Measure the incoming AC line supply voltage (L1-L2, L2-L3, L3-L1) at the infeed power terminals (e.g., X1 or L1/L2/L3) using a true RMS multimeter, monitoring for sags.

2. 2

   2. Verify parameter P0283 (Minimum DC link voltage threshold) is set correctly according to the system's nominal voltage and expected variations, not too close to nominal.

3. 3

   3. Inspect all power connections from the main breaker to the infeed unit's input terminals for tightness and corrosion.

4. 4

   4. Check the specification of the line reactor and compare it to the infeed unit's rating and system requirements.

5. 5

   5. Monitor the DC link voltage (r0026) in the infeed unit during operation to identify when and how severely the voltage drops.