dCE2

Communication Error2

Yaskawa · GA500 Maintenance and Troubleshooting

What does dCE2 mean?

Similar to dCE1, this communication error points to a temporary drive hardware issue primarily caused by electrical noise. This can lead to unreliable drive performance, erratic operation, and potential system downtime.

Common Causes

  • Transient voltage spikes or surges on the control power supply (e.g., 24VDC) disrupting internal logic.
  • Failure of optical isolators or galvanic isolation barriers used in internal communication paths.
  • Inadequate shielding of internal communication traces on the PCB, making them susceptible to crosstalk.
  • Software timeout in an internal communication protocol due to excessive processing load or unexpected delays.
  • Corrosion or oxidation on critical internal board-to-board connector pins, causing high resistance.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    1. Reset the drive (e.g., by cycling the control power via terminal S1/SC or equivalent) and check status.

  2. 2

    2. Check the integrity of the main earth connection from the drive to the central grounding point.

  3. 3

    3. Inspect for loose internal components or boards that may be vibrating and causing intermittent connections.

  4. 4

    4. Review the ambient environment for strong electromagnetic fields or radio frequency interference (RFI) sources.

  5. 5

    5. Replace any suspect internal ribbon cables or small interconnection wires that appear stressed or damaged.

  6. 6

    6. If the drive is equipped with a fan, verify its operation and ensure proper airflow over internal components.

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Verified technical data. Last updated: March 2026

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Source: Yaskawa GA500 Maintenance and Troubleshooting