Mains phase loss fault

What does F382 mean?

The DIAX04 SSE-03VRS power supply unit has detected that one or more phases of its three-phase AC mains input supply are missing. This leads to unbalanced input current and potentially dangerous voltage ripples on the DC bus. The unit shuts down to prevent damage to its internal components and connected drives.

• One or more fuses have blown in the incoming AC mains supply circuit to the DIAX04 SSE-03VRS power supply unit.
• A circuit breaker tripped, leading to the loss of a phase.
• Loose or broken connection on one of the incoming AC mains phases at the power supply unit or upstream.
• Failure of an upstream contactor or switch, preventing one phase from reaching the unit.
• Internal rectifier failure within the DIAX04 SSE-03VRS power supply unit.

Click steps to track your progress.

1. 1

   Measure the voltage between all three phases (L1-L2, L2-L3, L3-L1) at the input terminals of the DIAX04 SSE-03VRS power supply unit. Verify all phases are present and balanced.

2. 2

   Check all fuses in the incoming AC mains supply circuit and replace any blown fuses.

3. 3

   Inspect all incoming power wiring and connections for looseness, corrosion, or damage.

4. 4

   Verify the operation of any upstream contactors or switches to ensure all phases are being supplied.

5. 5

   If all external connections and power sources are verified good, this may indicate an internal rectifier fault within the DIAX04 SSE-03VRS power supply unit, requiring professional service.