Communication Error1

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This communication error indicates a temporary hardware problem in the drive, likely caused by electrical noise interference. This can disrupt internal drive communication and operation, leading to unexpected behavior or shutdowns.

• Excessive electromagnetic interference (EMI) from external sources (e.g., welding equipment, large contactors).
• Improper grounding of the drive or control cabinet, leading to ground loops or insufficient noise dissipation.
• Degradation of internal data communication lines or buffer circuits due to aging components.
• Loose internal ribbon cable connection between control sub-boards, causing intermittent data loss.
• Malfunction of a specific internal communication chip (e.g., CAN controller, serial transceiver).

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1. 1

   1. Power cycle the drive and observe if the fault clears.

2. 2

   2. Verify proper grounding of the drive frame and the motor cable shield to the drive's PE terminal.

3. 3

   3. Inspect internal data ribbon cables and connectors for secure seating and damage.

4. 4

   4. Install line reactors or EMI filters on the drive input (L1, L2, L3) if external noise sources are suspected.

5. 5

   5. Separate control wiring from power wiring by maintaining minimum specified distances (e.g., 30cm).

6. 6

   6. Check DC bus ripple voltage (at P+, N-) for excessively high values, indicating power supply instability.