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How to Fix FANUC Alarm SRVO-075: Position Error – Causes and Solutions

Quick Fix for FANUC SRVO-075

If SRVO-075 (Position Error) appears, try these immediate actions:

  • Power cycle the robot controller
  • Inspect servo motor and amplifier connections
  • Reset the alarm and move the axis at low speed
  • Avoid full-speed operation until the root cause is resolved

These steps can resolve temporary positioning discrepancies.

What is FANUC SRVO-075 Position Error?

FANUC Alarm SRVO-075 (Position Error) occurs when the controller detects that a servo axis is not at its commanded position or deviates beyond allowed tolerance.

Position feedback is critical for:

  • Precise axis motion
  • Coordinated multi-axis movement
  • Maintaining robot path accuracy

When a position error occurs, the robot stops to prevent misalignment or mechanical damage.

What Does SRVO-075 Mean?

SRVO-075 indicates that the servo axis position feedback differs from the commanded position.

This can result in:

  • Axis stalling or overshoot
  • Loss of path accuracy
  • Potential risk of collision or mechanical damage

Common Causes of FANUC SRVO-075

Encoder or Pulse Coder Signal Issues

Faulty encoder signals can cause position errors.

Common issues include:

  1. Damaged or broken encoder cables
  2. Loose connectors
  3. Electrical interference corrupting feedback

Inspecting and securing cables restores accurate position signals.

Servo Amplifier Malfunction

The amplifier may fail to process position feedback correctly.

Common issues include:

  1. Internal circuit failure
  2. Component degradation
  3. Parameter or configuration errors affecting servo loop

Mechanical Issues

Mechanical factors can lead to position deviation.

  • Excessive load or inertia
  • Gear backlash or wear
  • Axis obstruction or friction

Electrical Noise or Interference

External interference can corrupt servo feedback signals.

  • Nearby high-power devices
  • Poor grounding
  • Cable routing near drives or motors

Recommended Parts for SRVO-075 Repair

The following components are commonly required when resolving SRVO-075 alarms:

  • Encoder Cables
    → Replace if feedback signals are unstable or intermittent
  • FANUC Servo Amplifiers
    → Replace if amplifier cannot process position signals
  • Servo Motors with Encoders
    → Replace if motor position feedback is inaccurate

Browse available FANUC spare parts at inrobots.shop for reliable replacements and fast global shipping.

How to Troubleshoot FANUC SRVO-075

Step 1: Power Cycle the Controller

  • Turn off the system completely
  • Restart and verify if the alarm persists

Step 2: Inspect Encoder Cables

  • Check for physical damage
  • Ensure connectors are secure and properly seated

Step 3: Reseat Connectors

  • Disconnect and reconnect encoder and amplifier connectors
  • Ensure proper alignment and contact

Step 4: Identify Affected Axis or Amplifier

  • Determine which axis triggers the alarm
  • Focus troubleshooting on that specific amplifier or motor

Step 5: Check Servo Amplifier

  • Inspect amplifier LEDs and position feedback indicators
  • Confirm proper signal reception

Step 6: Evaluate Servo Motor and Mechanics

  • Test motor motion and encoder feedback
  • Check for mechanical obstructions, excessive friction, or backlash

Step 7: Check Electrical Environment

  • Ensure proper grounding
  • Reduce interference sources near cables

Pro Diagnostic Tip 

Swap Encoder Cables Between Axes or Amplifiers

  1. Disconnect the encoder cable from the affected axis or amplifier.
  2. Connect it to another axis and observe the alarm behavior.

Interpret Results:

  • Alarm moves to the other axis: The problem is likely the encoder cable from the Cable Collection.
  • Alarm stays on the same axis: The issue is likely the servo motor or servo amplifier, which should be checked in the Servo Motor collection.

Why Cable and Servo Motor Collections Are Key:

  • Encoder cables transmit critical position feedback signals from the servo motor to the controller. Damage, shielding breakdown, or loose connections often trigger SRVO-075.
  • Servo motors provide the actual position feedback. If the motor outputs inaccurate data, the controller cannot determine axis position, causing the alarm.

Next Steps:

  • Replace any faulty encoder cables to restore accurate signal transmission.
  • Replace defective servo motors or amplifiers to restore correct feedback.
  • Inspect mechanical components for friction, backlash, or obstruction that may affect position accuracy.

How to Fix FANUC SRVO-075

Proven Fix Methods

  • Replace damaged or faulty encoder cables
  • Replace defective servo amplifiers
  • Repair or replace affected servo motors
  • Check and correct mechanical issues
  • Clean and secure connectors
  • Improve grounding and shielding

Important Note

SRVO-075 indicates position feedback errors:

Ignoring this alarm can lead to axis misalignment, mechanical damage, or system shutdowns.

Preventing Position Errors

  • Inspect encoder cables and connectors regularly
  • Maintain proper grounding and shielding
  • Monitor mechanical wear on axes
  • Avoid excessive loads or speed changes
  • Perform scheduled maintenance checks

Related FANUC Alarm Codes

These alarms are closely related to servo feedback and position control issues.

Conclusion

FANUC Alarm SRVO-075 – Position Error indicates a deviation between commanded and actual servo axis position.

By inspecting cables, connectors, amplifiers, motors, and mechanical components, engineers can restore accurate motion control and reliable robot operation.

FAQ

Q1: What causes SRVO-075?

Common causes include encoder cable faults, amplifier issues, motor feedback errors, or mechanical problems.

Q2: Can I reset SRVO-075 and continue running?

Only if the issue is temporary. Persistent alarms require immediate troubleshooting.

Q3: Is SRVO-075 critical?

Yes, as it affects axis motion accuracy and safety.

Q4: How do I fix position errors?

Inspect cables, reseat connectors, repair or replace faulty amplifiers or motors, and check mechanical alignment.

Explore the Full Guide: Industrial Robot Fault Codes Library  →  Fanuc Alarm Codes

Explore the complete guide for troubleshooting, repair strategies, and component replacement across industrial robot systems.

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