Softstart fault power supply unit

What does F316 mean?

The softstart circuit of the DIAX04 SSE-03VRS power supply unit failed during its pre-charge sequence. This circuit slowly charges the DC bus capacitors to limit inrush current at power-up. A fault indicates that the capacitors did not charge correctly, the softstart resistors are faulty, or the bypass contactor did not engage. The drive faults to prevent high inrush current and potential damage.

• Faulty softstart resistors or thermistors in the DIAX04 SSE-03VRS power supply unit.
• The DC bus pre-charge contactor or relay failed to engage or release.
• Overload on the DC bus during pre-charge, preventing proper voltage ramp-up.
• Short circuit on the DC bus, preventing successful pre-charge.
• Internal control circuit fault in the DIAX04 SSE-03VRS power supply unit monitoring the softstart process.

Click steps to track your progress.

1. 1

   Perform a power cycle of the DIAX04 SSE-03VRS drive. Listen for the softstart contactor clicking and check the DC bus voltage ramp-up.

2. 2

   Check for any external short circuits or heavy loads on the DC bus that could prevent proper pre-charging.

3. 3

   Inspect the softstart resistors (if accessible) in the DIAX04 SSE-03VRS power supply unit for signs of overheating or damage.

4. 4

   Verify the operation of the bypass contactor/relay in the DIAX04 SSE-03VRS power supply unit. Check its coil and contacts.

5. 5

   If the fault persists, it likely indicates an internal hardware fault within the DIAX04 SSE-03VRS power supply unit's pre-charge circuit, requiring factory service or replacement.