d3

Serial data destroyed by noise

Fanuc · Series 30i/31i/32i-MODEL B Plus

What does d3 mean?

Serial data transmitted between the sensor (serial) and the Spindle Amplifier was detected as corrupted by noise. This indicates a problem with the cable's shielding, external electrical interference, or the overall integrity of the data transmission path. Data corruption can lead to incorrect feedback or control.

Common Causes

  • Noise interference affecting serial data transmission
  • Inadequate shielding of the cable between the sensor (serial) and Spindle Amplifier

Repair Steps

  1. 1

    Check the shielding effectiveness of the cable between the sensor (serial) and Spindle Amplifier.

  2. 2

    Review the 'Detectors' section in the FANUC SERVO AMPLIFIER αi series Descriptions (B-65282EN) for specific cable requirements and grounding practices.

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Verified technical data. Last updated: March 2026
Source: Fanuc Series 30i/31i/32i-MODEL B Plus