Fanuc Robot Fault Recovery — What to Check First

INTRO

A faulted Fanuc robot can stop your entire production line. Whether it’s a motion alarm, servo fault, or system error, knowing where to start can save valuable time.

COMMON FANUC FAULT TYPES

1. Servo Faults (SRVO)

  • Overtravel

  • Position deviation

  • Encoder issues

2. Motion Alarms

  • Path interference

  • Incorrect position

  • Mechanical obstruction

3. Communication Faults

  • PLC not sending signals

  • Network interruptions

  • Incorrect I/O mapping

4. Safety Faults

  • E-stop triggered

  • Fence open / safety circuit broken

  • Safety PLC conditions not met

QUICK RECOVERY STEPS

Before calling for help, check:

  • Is the robot in AUTO mode?

  • Are all E-stops cleared?

  • Are safety gates closed?

  • Can the fault be reset from the pendant?

  • Has anything physically moved or shifted?

WHEN THE FAULT WON’T CLEAR

If the fault keeps coming back, it’s usually due to:

  • Incorrect positions or lost mastering

  • PLC logic issues

  • Integration problems with upstream/downstream equipment

WHY THIS MATTERS

Repeated faults:

  • Slow production

  • Cause inconsistent operation

  • Can lead to bigger failures if ignored

HOW FIDELIS CONTROLS CAN HELP

Fidelis Controls provides fast robot troubleshooting and recovery support.

We:

  • Diagnose root cause (not just reset faults)

  • Restore safe and reliable operation

  • Align robot behavior with PLC logic

Call Now For Immediate Support

248.250.3805