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FANUC SRVO-068 Alarm : Causes, Troubleshooting & Encoder Cable Fix
The FANUC SRVO-068 alarm, also known as a pulse coder alarm, is one of the most common issues in FANUC robots. It indicates that the controller has lost reliable position feedback from the servo motor.
This alarm often stops robot motion immediately, making it critical to diagnose and fix quickly to minimize downtime.
What Does FANUC SRVO-068 Alarm Mean?
SRVO-068 occurs when the controller cannot properly read the signal from the pulse coder (encoder). Since the robot relies on encoder feedback for precise positioning, any signal interruption will trigger this alarm.
Common Symptoms in Real Applications
- Robot stops suddenly during operation
- Specific axis cannot move or respond
- Alarm appears intermittently, especially during motion
- System works after restart but fails again later
If the issue is intermittent, it is often a strong indication of cable-related problems rather than a complete hardware failure.
Main Causes of SRVO-068 Alarm
1. Damaged Encoder Cable (Most Common)
In most real-world cases, SRVO-068 is caused by internal wire breakage in the encoder cable. This type of damage is often invisible from the outside and occurs due to repeated robot movement and cable bending.
2. Loose or Corroded Connectors
Connector issues can interrupt signal transmission between the encoder and controller, triggering unstable feedback signals.
3. Faulty Pulse Coder (Encoder)
If the encoder itself fails, the controller cannot receive accurate position data.
4. Servo Amplifier or Control Board Issues
Although less common, internal faults in the servo amplifier or control board can also cause feedback errors.
Step-by-Step Troubleshooting Guide
Step 1: Perform a Visual Inspection
Check the encoder cable for visible wear, bending damage, or loose connections. Pay close attention to areas near joints where movement is frequent.
Step 2: Check Connectors
Disconnect and reconnect all encoder-related connectors. Ensure there is no corrosion or contamination.
Step 3: Test for Intermittent Cable Failure
Move the robot slowly while monitoring the alarm. If the alarm appears only during movement, the cable is very likely damaged internally.
Step 4: Swap Test (If Available)
If possible, replace the encoder cable with a known working one. If the alarm disappears, the cable is confirmed faulty.
Step 5: Check Servo Amplifier
If the problem persists after cable replacement, inspect the servo amplifier and related hardware.
Recommended Replacement Parts
Based on field experience, replacing the encoder cable is often the fastest and most reliable solution.
Check Compatible Encoder Cables →
Repair vs Replacement: What Should You Do?
While temporary fixes such as reconnecting cables may work, they are usually not reliable for long-term operation.
- Replace the cable if the issue is intermittent
- Replace the encoder if no signal is detected at all
- Inspect amplifier if problem persists after replacement
In industrial environments, replacing faulty components is typically more cost-effective than repeated troubleshooting downtime.
Real-World Insight
In many maintenance cases, SRVO-068 is not caused by complete cable breakage, but by internal conductor fatigue. This means the robot may work normally at rest but fail during movement.
This is why cable replacement is often recommended even if no external damage is visible.
Related FANUC Alarms
FAQ
Can SRVO-068 be reset?
Yes, but if the root cause is not fixed, the alarm will return.
Is SRVO-068 dangerous?
It can affect positioning accuracy and should be resolved immediately.
What is the fastest way to fix SRVO-068?
In most cases, replacing the encoder cable is the quickest and most effective solution.
Explore the Full Guide: Industrial Robot Fault Codes Library → FANUC Alarm Codes
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