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ErrorLib — Industrial Fault Code Library

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SV0366

PULSE MISS(INT)

Fanuc · Alpha i Series Servo Amplifier

What does SV0366 mean?

A pulse error occurred on the built-in Pulsecoder, indicating that expected pulses were not detected. This impacts the accuracy of position feedback from the internal encoder.

Common Causes

  • Interference on the pulse signal lines of the built-in Pulsecoder.
  • Internal Pulsecoder encoder disk damage or slippage.
  • Faulty signal generation within the built-in Pulsecoder.
  • External noise affecting pulse signal integrity.
  • Incorrect pulse output configuration in servo parameters.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Measure signal amplitude on internal Pulsecoder output terminals.

  2. 2

    Inspect internal Pulsecoder encoder disk for scratches or misalignment.

  3. 3

    Test internal Pulsecoder signal generation with a known good replacement if possible.

  4. 4

    Filter incoming power to the servo drive to reduce noise.

  5. 5

    Verify parameter P1-01 (Encoder Pulse Output) matches system requirements.

Browse all codes in this manual (101)
Verified technical data. Last updated: April 2026

Related Faults

0233Velocity Pulse Count Exceeded0243Position Pulse Count Exceeded0434Velocity Loop Integral Gain Overflow
Source: Fanuc Alpha i Series Servo Amplifier
Open Manual (Page 127)Search more codes in this manual