LOW LINE VOLTAGE FAULT

What does 904 mean?

The AC input power has dropped below 80% of the Nominal AC Line Voltage (parameter #9) for three consecutive cycles, or below 50% for a single cycle. This sets the Severe Fault flag, forces the DSD 412 current reference to zero, and shuts down the drive. This fault will often occur concurrently with an F903 fault.

• Significant sag or brownout events in the AC input power supply.
• Incorrect setting of parameter #9 (Nominal AC Line Voltage) for the actual input power.

Click steps to track your progress.

1. 1

   Measure the AC input voltage to confirm it consistently remains above 80% of the value set in parameter #9.

2. 2

   Verify that parameter #9 (Nominal AC Line Voltage) is correctly configured to match the actual incoming AC line voltage.