Switch mode fault

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This fault indicates an internal problem with the drive's switch mode power supply, which is responsible for internal voltage regulation. This is an internal hardware failure within the drive itself.

• Internal hardware failure of the drive's auxiliary switch mode power supply (SMPS) components (e.g., capacitors, ICs, transformers).
• Degradation or failure of electrolytic capacitors within the SMPS due to age, heat, or voltage stress.
• Transient voltage spike or brownout condition on the main input power affecting the SMPS startup or operation.
• Short circuit on one of the internal low voltage DC rails powered by the SMPS, causing it to shut down.
• Firmware corruption or internal communication error affecting the SMPS control.

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1. 1

   1. Power cycle the drive by completely removing all input power (L1, L2, L3 and control power) for at least 5 minutes to allow internal capacitors to discharge.

2. 2

   2. Measure the incoming AC line voltage (phase-to-phase) at terminals R, S, T to ensure it is stable and within the drive's rated input range.

3. 3

   3. Visually inspect the drive's control board and power supply section for any signs of burnt components, bulging capacitors, or discolored areas.

4. 4

   4. Verify that the ambient temperature around the drive is within the manufacturer's specified operating range (e.g., 0-40°C) to rule out overheating.

5. 5

   5. If the fault persists after power cycling and external checks, the drive likely requires replacement or professional repair by a certified technician.

6. 6

   6. Check for any active warning messages on the control panel (if accessible) that might provide more specific diagnostic information related to internal power.