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ErrorLib — Industrial Fault Code Library

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SRVO-235

Short Term Single Chain Failure

Fanuc · R-30iB Mate + Mate Plus Robot

What does SRVO-235 mean?

A short-term single chain failure condition is detected. This can be caused by a momentary or 'half' release of the DEADMAN switch or a 'half' operation of the emergency stop switch, indicating a transient safety circuit anomaly.

Common Causes

  • Temporary failure in a servo drive's communication chain or power supply.
  • Brief interruption in the feedback signal from a single motor in a multi-axis configuration.
  • Momentary voltage fluctuation affecting servo amplifier performance.
  • Loose connection in the power or signal wiring for a servo axis.
  • Transient overload condition on a specific servo axis.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Cause the same error to occur again, and then perform the alarm resetting procedure.

  2. 2

    Replace the emergency stop board.

  3. 3

    Replace the 6-Axis servo amplifier.

Browse all codes in this manual (53)
Verified technical data. Last updated: April 2026

Related Faults

24EXTEmergency Stop Circuit 24V Fault24TTeach Pendant 24V FaultALM LED Blink (1:1)Broken Wire or Noise (Subsequent Unit)
Source: Fanuc R-30iB Mate + Mate Plus Robot
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