UnderVoltage

What does F4 mean?

An undervoltage fault indicates that the incoming AC line voltage has dropped below the drive's acceptable operating threshold. This can be caused by power sags or prolonged low line voltage conditions.

• Input supply voltage has dropped below the minimum acceptable level.
• Undervoltage condition on the DC bus.
• External power source instability.
• Low voltage detected at the input terminals (P1-10).

Click steps to track your progress.

1. 1

   Measure the incoming AC line voltage at the drive input terminals (L1, L2, L3) to confirm it is within the drive's specified operational range.

2. 2

   Check for any issues with the upstream power distribution system that might cause low voltage.