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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

DRDY

Servo Amplifier Not Ready

Fanuc · R-30iB Mate + Mate Plus Robot

What does DRDY mean?

The DRDY (Green) LED indicates that the servo amplifier is ready to drive the servo motor. This fault occurs if the LED does not light when the motor is activated, suggesting the servo amplifier is not reaching a ready state to control the motor.

Common Causes

  • Servo amplifier has not completed its initialization sequence.
  • Power supply issues preventing servo amplifier readiness.
  • Internal servo amplifier fault requiring reset or service.
  • Incomplete communication link between servo controller and amplifier.
  • Over-temperature condition preventing servo amplifier operation.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Replace the servo amplifier.

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

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