F004

UnderVoltage

Allen-Bradley · PowerFlex 520-series Adjustable Frequency AC Drive

What does F004 mean?

The DC bus voltage within the drive has dropped below its minimum acceptable threshold. This usually occurs due to an insufficient incoming AC line voltage, sags, or momentary power interruptions. Prolonged undervoltage can cause erratic drive behavior or component stress.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    Check the main power supply and upstream breakers or fuses for proper operation and capacity.

Source: Allen-Bradley PowerFlex 520-series Adjustable Frequency AC Drive
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