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Yaskawa A.860 Following Error: Causes, Troubleshooting & Repair Guide
Error Overview
- Alarm Code: A.860
- Type: Following Error
- Category: Servo / Motion Control
- Severity: High (can stop robot during motion)
- Related System: Servo motor, encoder, drive, control loop
Field insight:
The Yaskawa A.860 following error is closely related to A.850, but it occurs during active motion rather than at the final stopping position.
In real-world applications, th is alarm usually indicates that the servo system cannot respond fast enough to changing motion demands.
What Does Yaskawa A.860 Alarm Mean?
The Yaskawa A.860 alarm occurs when the actual motor position continuously lags behind the commanded position during movement.
In simple terms:
The robot cannot keep up with the motion command in real time, so the system stops to prevent instability or loss of control.
This is the key difference between:
- A.850 position error→ final position mismatch
- A.860 following error→ continuous tracking failure during motion
Quick Fix (5-Minute Check First)
Before performing deep diagnostics:
- Reduce acceleration and speed
- Restart the system
- Check payload and load conditions
- Run the robot at lower motion demand
If the alarm disappears at lower speed, the issue is usually related to dynamic load, tuning, or torque limitations.
Common Symptoms of A.860 Following Error
- Robot lags behind commanded motion
- Jerky or unstable movement
- Alarm appears during acceleration
- Motion becomes inconsistent under load
- Continuous position deviation before stop
Main Causes of Yaskawa A.860 Alarm
1. Insufficient Torque (Most Common)
- Excessive payload
- Undersized servo motor
- High inertia mismatch
2. Aggressive Motion Profile
- High acceleration settings
- Sudden speed changes
- Sharp directional movement
3. Poor Servo Tuning
- Gain settings too low
- Slow servo response
- Unstable motion loop
4. Mechanical Resistance
- Friction or binding
- Gearbox wear
- Misalignment in motion components
5. Encoder Feedback Delay
- Encoder signal instability
- Cable degradation
- Communication delay
In some cases, unstable feedback may also trigger position-related faults.
If positioning accuracy is also affected, reviewing Yaskawa A.850 position error troubleshooting can help isolate the root cause.
How to Troubleshoot Yaskawa A.860 Following Error
Unlike static positioning faults, A.860 troubleshooting focuseson real-time motion performance.
Step 1 – Identify Motion Condition
- During acceleration→ parameter issue
- Under load→ torque limitation
- Random→ feedback instability
Step 2 – Reduce Motion Demand
- Lower acceleration
- Smooth motion curve
- Reduce sudden directional changes
If the alarm disappears after reducing motion demand, the system is dynamically overloaded.
Step 3 – Check Load and Torque
- Reduce payload temporarily
- Verify motor sizing
- Check inertia matching
If overload conditions are present, reviewing Yaskawa A.720 overload alarm troubleshooting may help identify mechanical stress issues
Step 4 – Optimize Servo Tuning
- Adjust gain parameters
- Improve servo response speed
- Reduce oscillation or delay
Proper tuning is often enough to resolve mild following instability.
Step 5 – Inspect Mechanical System
- Check for friction or binding
- Inspect gearbox condition
- Ensure smooth mechanical movement
Mechanical resistance is one of the most overlooked causes of following errors.
Step 6 – Verify Feedback System
Signal delay or feedback instability can prevent the servo system from tracking motion correctly.
Inspect components such as Yaskawa motor cables and encoder cables to ensure stable signal transmission.
If torque response remains insufficient even after tuning, evaluating compatible Yaskawa servo motors may be necessary to restore stable motion tracking.
Key Diagnostic Signs of Yaskawa A.860 Following Fault
|
Symptom |
Likely Cause |
|
Lag during motion |
Torque or tuning issue |
|
Jerky movement |
Mechanical or tuning |
|
Error during acceleration |
Parameter issue |
|
Continuous deviation |
Following failure |
Recommended Parts for A.860 Repair
Once the root cause is confirmed, the issue is usually related to:
Servo Motors
If torque or response cannot meet demand, selecting from your Yaskawa servo motors range ensures stable tracking performance.
Motor Cables
Signal delay or instability can worsen following errors. Inspect or replace Yaskawa motor cables if needed.
Servo Drive
If tuning cannot stabilize motion, the drive may need evaluation.
Yaskawa A.860 Alarm: Repair or Replace Decision Guide
Repair (Recommended First)
- Servo parameter tuning
- Load reduction
- Mechanical adjustment
- Feedback system inspection
Replace (When Necessary)
- Motor torque capacity is insufficient
- Persistent dynamic lag remains
- Servo drive cannot maintain stable tracking
In long-term production environments, repeated A.860 alarms often indicate performance degradation rather than temporary tuning issues.
Prevention Tips
- Avoid aggressive motion profiles
- Maintain proper servo tuning
- Match motor capacity with load
- Regularly inspect mechanical system
Related Yaskawa Alarm Codes
- A.850 Position Error
- A.840 Overspeed Error
- A.720 Overload Alarm
Understanding these Yaskawa Alarm Codes can help identify the true root cause.
Understanding related alarms can help isolate root causes faster:
- Yaskawa A.850 position error troubleshooting(final positioning mismatch)
- Yaskawa A.840 overvoltage alarm troubleshooting(speed and deceleration instability)
- Yaskawa A.720 overload alarm troubleshooting(mechanical load issues)
These alarms are often interconnected in high-speed robotic applications.
FAQ
What is the difference between Yaskawa A.850 and A.860?
A.850 refers to final position mismatch, while A.860 indicates continuous tracking failure during motion.
Can servo tuning fix A.860 following error?
Yes. In many cases, adjusting gain and motion parameters can improve tracking stability.
Can overload conditions cause A.860 alarm?
Yes. Excessive load can reduce available torque and prevent the motor from following motion commands accurately.
Can encoder cable issues trigger A.860 alarms?
Yes. Feedback delay or unstable encoder signals can create motion tracking errors.
Why does A.860 occur during acceleration?
Because acceleration requires peak torque and rapid servo response. If the system cannot react quickly enough, following deviation increases beyond allowable limits.
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