What faults can occur due to poor robot grounding and shielding? Troubleshooting communication and encoder interference

Welders, frequency converters, servo systems, and high-power motors all generate electromagnetic interference. If the robot control cabinet, cable shielding, and equipment equipotential bonding are not properly configured, faults often exhibit randomness and are related to operating conditions.

1. Key Inspection Points
2. Check the protective grounding of the control cabinet, the grounding of the robot body, and the equipotential bonding of peripheral equipment.
3. Verify that the termination method for the shielding layers of encoder, communication, and analog signal cables complies with equipment requirements.
4. Check whether power cables and signal cables run parallel for long distances, are bundled together, or share unsuitable cable ducts.
5. Record whether faults are related to welder arc initiation, frequency converter startup, contactor operation, or thunderstorm weather.
6. Implementation Steps
7. Measure the continuity of protective grounding and the potential difference between key equipment.
8. Reorganize the spacing between power cables and signal cables; when crossing, try to use an approach close to a right angle.
9. Repair grounding points and shield connections that are loose, corroded, or isolated by paint.
10. After rectification, conduct continuous verification under the production conditions most likely to trigger interference.
11. Common Misconceptions
12. Randomly implementing multiple grounding points to solve interference, which instead creates ground loops.
13. Only replacing communication boards or encoders without checking cable shielding and power cable routing.
14. Using static no-load tests instead of actual interference condition tests like welding or machining.
15. Summary

Poor grounding and shielding can cause encoder alarms, communication dropouts, I/O malfunctions, analog signal fluctuations, and intermittent faults that only appear when high-power equipment starts.

Industrial Robot Repair Hotline: +86 18122009539

Contact Repair Engineer: +86 18122009539