Control Power Supply Undervoltage

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An undervoltage condition was detected in the drive's internal control circuit while it was operating. This fault typically points to either an excessive load being drawn by external control wiring connected to the drive's power supplies, or an internal electrical fault, such as a short circuit, on the power or gate drive PCB.

• Excessive current draw from the drive's internal 24VDC control power supply by external devices connected to terminals like +24V, S1, S2, S3, S4.
• Short circuit or ground fault in external control wiring connected to the drive's I/O terminals (e.g., S1-S8, +24V, A1, A2, etc.).
• Malfunction of the drive's internal switching mode power supply (SMPS) responsible for generating the control voltage.
• Failure of internal voltage regulator components on the drive's control board.

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

1. 1

   Disconnect all external wiring from the drive's control terminals (e.g., S1-S8, +24V, A1, A2, etc.) and reset the drive to determine if the fault clears.

2. 2

   Measure the voltage output at the drive's internal +24V control power supply terminal (often labeled +24V or +VDC) with respect to COM, verifying it is within 23-25VDC.

3. 3

   Inspect each external control wire and connected device (e.g., sensors, relays, PLCs) for short circuits, loose connections, or incorrect wiring before reconnecting.

4. 4

   Use an insulation tester (megger) to check for ground faults on external control wiring connected to the drive's I/O terminals.

5. 5

   If the fault persists with all external control wiring disconnected, perform a factory reset (parameter A1-03 = 2220 or similar) and retest, noting internal hardware failure possibility.