Control Circuit Error

What does CPF21 mean?

This code indicates a generic hardware problem within the drive's control circuit. This suggests an internal malfunction that could prevent safe and reliable operation and may require internal component inspection or replacement.

• Malfunction of the internal current sensing circuit (e.g., current transformers, Hall-effect sensors, or their ADC inputs) on the control board.
• Loss of internal current sensor calibration data, leading to inaccurate motor current measurements.
• Noise ingress or ground loop issues affecting the integrity of the internal current measurement signals.
• Component failure (e.g., current shunt resistors, isolation amplifiers) within the control board's current measurement path.

Click steps to track your progress.

1. 1

   Record the motor nominal current (P1-01) and any current limit parameters (e.g., P2-03) from the drive's display.

2. 2

   Perform a full power cycle by disconnecting incoming AC power (L1, L2, L3) and waiting for 10 minutes for complete DC bus discharge.

3. 3

   Use a multimeter to verify the integrity of the motor cables (U, V, W) for phase-to-phase shorts or phase-to-ground faults.

4. 4

   Visually inspect the control board, particularly the current sensing circuits and their associated components, for signs of overheating, cracks, or discoloration.

5. 5

   Check for secure connections of internal wiring harnesses that carry current feedback signals from the power stage to the control board.

6. 6

   Attempt a factory parameter reset (e.g., Parameter P9-02) and re-enter essential motor data (P1-XX) and current-related parameters to re-initialize the current sensing logic.