Mains failure

What does F381 mean?

With HVR power supply units only! At least one phase of the 3-phase power supply input to the HVR unit is missing, indicating a loss of input power.

• At least one phase of the 3-phase power supply input to the HVR unit is missing.

Click steps to track your progress.

1. 1

   Verify the incoming 3-phase power supply at the input terminals of the Indramat HVR power supply unit (X1/L1, X1/L2, X1/L3) using a multimeter. Confirm all three phases are present and balanced.

2. 2

   Inspect all upstream mains fuses and circuit breakers for the power supply unit. Replace any blown fuses or reset tripped breakers.

3. 3

   Check power contactors and their auxiliary contacts for proper operation and engagement in the power distribution circuit.

4. 4

   Inspect all power wiring connections from the mains supply to the HVR unit for looseness, damage, or disconnections.