Cause : Instantaneous power failure comes when a power failure occurs for longer than 15 ms(this also applies to inverter input shut-off), the instantaneous power failure protective function is activated to trip the inverter in order to prevent the control circuit from malfunctioning.

1. If a power failure persists for 100 ms or longer, the fault warning output is not provided, and the inverter restarts if the start signal is ON upon power restoration. (The inverter continues operating if an instantaneous power failure is within 15 ms.)
2. In some operating status (load magnitude, acceleration/ deceleration time setting, etc.), overcurrent or other protection may be activated upon power restoration. When instantaneous power failure protection is activated, the IPF signal is output.
3. Find the cause of instantaneous power failure occurrence.
4. Remedy the instantaneous power failure.
5. Prepare a backup power supply for instantaneous power failure.