Instantaneous Power Failure Protection

What does E.IPF mean?

This protection activates if the main power supply (inverter input R, S, T or L1, L2, L3) experiences a power failure lasting longer than 15 milliseconds. It stops the inverter output to prevent control circuit malfunction. During the event, the alarm warning output contacts switch state (open across B-C, close across A-C). If the power failure duration exceeds 100 milliseconds, the alarm warning output is not provided, and the inverter may attempt to restart automatically if a start signal is present upon power restoration.

1. 1

   Monitor the incoming power supply voltage at the inverter input terminals (R, S, T or L1, L2, L3) for sags or interruptions lasting more than 15ms using a power quality analyzer.

2. 2

   Verify the stability and reliability of the upstream power source and any associated circuit breakers or contactors.

3. 3

   Check for the presence and functionality of any backup power supply (e.g., UPS) or ride-through option designed to bridge momentary power losses to the inverter.

4. 4

   Consult page 89 of the inverter manual for parameters related to automatic restart after instantaneous power failure and verify their settings.