A/D Conversion Error

What does CPF02 mean?

An Analog-to-Digital (A/D) conversion error or a control circuit error has occurred, indicating a potential issue or damage within the drive's control circuit. This means the drive cannot accurately convert analog input signals (e.g., current, voltage, feedback) into digital values for processing, risking unstable operation, incorrect control, or damage to connected equipment.

• Malfunction of the Analog-to-Digital converter circuit on the control board.
• Unstable or noisy analog input signals (e.g., speed reference via A1, A2 terminals).
• Damage to the control board affecting A/D components or their power supply.
• Interference from external electrical noise affecting sensitive analog circuitry.
• Excessive voltage or current applied to an analog input terminal beyond its rating.

Click steps to track your progress.

1. 1

   Perform a full power cycle of the drive (turn off main input power for 30 seconds, then reapply).

2. 2

   Temporarily disconnect all analog input signals (e.g., from A1, A2 terminals) and re-power the drive.

3. 3

   Measure the voltage levels on the analog input terminals (e.g., A1-AC) to ensure they are within specification.

4. 4

   Inspect the control board for any visible signs of damage, burnt components, or loose connections.

5. 5

   Check grounding and shielding of analog signal cables to mitigate electrical noise interference.

6. 6

   If the fault persists after isolating external analog inputs, the control board or entire drive likely requires replacement.