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ErrorLib — Industrial Fault Code Library

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P5V

+5V Power Supply Fault

Fanuc · R-30iB Mate + Mate Plus Robot

What does P5V mean?

The P5V (Green) LED indicates that the internal power supply circuit of the servo amplifier is normally outputting +5 V. If this LED does not light, it signifies a failure in the +5V power supply within the servo amplifier, or a ground fault on the +5V wire of the robot connection cable (RP1/RMP1).

Common Causes

  • Internal +5V power supply within the servo controller or related module has failed.
  • Short circuit on a +5V power line.
  • Overload condition on the +5V power rail.
  • Faulty voltage regulator for the +5V supply.
  • Component failure on the power supply board.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the robot connection cable (RP1/RMP1) to see if there is a ground fault in the +5V wire.

  2. 2

    Replace the servo amplifier.

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

Related Faults

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Source: Fanuc R-30iB Mate + Mate Plus Robot
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