Internal Detected Fault

What does InF mean?

An internal hardware or software error has occurred within the soft starter itself. This signifies a malfunction of the device's internal components or firmware.

• Malfunction of an internal sensor (e.g., temperature sensor on a heatsink, current sensor on a phase leg).
• Failure of an internal control board component (e.g., processor, memory chip, internal power supply module).
• Corrupted firmware or bootloader due to electrical noise or an incomplete update.
• Power supply instability within the soft starter's control electronics circuitry.
• Failure of internal gate drive circuitry responsible for firing the SCRs (Silicon Controlled Rectifiers).

Click steps to track your progress.

1. 1

   1. Cycle power to the soft starter; wait a full 30 seconds after shutdown before reapplying power for a complete reset.

2. 2

   2. Check for loose internal connections, especially ribbon cables or power supply connectors, by gently reseating them.

3. 3

   3. Verify that the incoming control power supply (e.g., 24VDC, 120VAC to L1/L2) is stable and within specified limits using a multimeter.

4. 4

   4. Look for visible signs of damage on the control board (e.g., burnt components, bulging capacitors, discoloration).

5. 5

   5. If safely accessible and documented, measure the internal DC bus voltage (e.g., between P+ and N-) to verify proper power conversion.