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How to Fix FANUC Alarm SRVO-062: BZAL Alarm – Causes and Solutions
Quick Fix for FANUC SRVO-062
If SRVO-062 (BZAL Alarm) appears, try these immediate actions:
- Power cycle the robot controller
- Inspect the servo amplifier and FSSB connections
- Check the BZAL (Brake Zone Alarm) wiring and connectors
- Reset the alarm and test motion at low speed
- Avoid full-speed operation until the root cause is resolved
These steps can resolve temporary brake-related errors.
What is FANUC SRVO-062 BZAL Alarm?
FANUC Alarm SRVO-062 (BZAL Alarm) occurs when the controller detects a problem in the brake system of a servo axis.
The BZAL signal is responsible for:
- Monitoring brake engagement status
- Preventing motion when the brake is applied or released incorrectly
- Ensuring safety during axis start/stop operations
When a BZAL alarm occurs, the robot stops to prevent unsafe motion.
What Does SRVO-062 Mean?
SRVO-062 indicates that the servo amplifier or controller detects an abnormal brake signal.
This can result in:
- Axis unable to move or stop correctly
- Servo motor motion blocked
- Potential misalignment or uncontrolled movement
Common Causes of FANUC SRVO-062
Brake Signal Cable or Connection Failure
Faulty wiring is a primary cause.
Common issues include:
- Damaged or broken BZAL cables
- Loose or poorly connected terminals
- Shielding damage causing signal interference
Inspecting and securing cables restores stable brake signal monitoring.
Faulty Connectors
Connectors between the amplifier and brake signal system can disrupt communication.
Common issues include:
- Oxidized or bent pins
- Poorly seated connectors
- Contaminated contact surfaces
Proper cleaning and reseating often resolves these issues.
Servo Amplifier Input Fault
The amplifier may fail to process brake signals correctly.
Common issues include:
- Internal circuit malfunction
- Component degradation
- Parameter or configuration errors
Electrical Noise or Interference
External interference can corrupt BZAL signals.
- Nearby high-power devices
- Poor grounding
- Incorrect cable routing
Recommended Parts for SRVO-062 Repair
The following components are commonly required when resolving SRVO-062 alarms:
-
BZAL Signal Cables
→ Replace if signal is unstable or interrupted -
FANUC Servo Amplifiers (Alpha i / Beta i Series)
→ Replace if amplifier cannot process brake signals -
Servo Motors with Brake Units
→ Needed if brake engagement feedback is faulty
Browse available FANUC spare parts at inrobots.shop for reliable replacements and fast global shipping.
How to Troubleshoot FANUC SRVO-062
Step 1: Power Cycle the Controller
- Turn off the system completely
- Restart and verify if the alarm persists
Step 2: Inspect BZAL Cables
- Check for physical damage
- Ensure connectors are secure and properly seated
Step 3: Reseat Connectors
- Disconnect and reconnect all BZAL and amplifier connectors
- Ensure proper alignment and contact
Step 4: Identify Affected Axis or Amplifier
- Determine which axis or amplifier triggers the alarm
- Focus troubleshooting on that module
Step 5: Check Servo Amplifier
- Inspect amplifier LEDs and brake signal indicators
- Confirm proper signal reception
Step 6: Evaluate Servo Motor Brake
- Test brake engagement and release
- Replace motor or brake assembly if feedback is inconsistent
Step 7: Check Electrical Environment
- Ensure proper grounding
- Reduce interference sources near cables
Pro Diagnostic Tip
A field-proven method to isolate SRVO-062 root causes:
Swap BZAL (Brake Signal) Cables Between Axes or Amplifiers
- Disconnect the BZAL cable from the affected axis or amplifier.
- Connect it to another axis or amplifier and observe the alarm behavior.
Interpret Results:
- Alarm moves to the other axis: The problem is likely the BZAL cable itself.
- Alarm stays on the same axis: The issue is likely the servo amplifier input or motor brake unit.
Why Cable Integrity Matters:
BZAL cables transmit critical brake status signals. Faults such as:
- Damaged or fatigued wires
- Loose or oxidized connectors
- Shielding degradation
…can cause intermittent brake feedback, triggering SRVO-062 and unsafe axis stops.
Next Steps:
- Inspect and replace any faulty BZAL cables to restore stable brake signal feedback.
- If the alarm persists after cable replacement, check the servo amplifier input or motor brake unit.
- Ensure proper grounding and shielding to reduce interference from nearby high-power devices.
How to Fix FANUC SRVO-062
Proven Fix Methods
- Replace damaged or faulty BZAL cables
- Replace defective servo amplifiers
- Repair or replace affected servo motor brake units
- Clean and secure connectors
- Improve grounding and shielding
Important Note
- SRVO-062 indicates brake signal instability:
- Ignoring this alarm can lead to axis lock, uncontrolled movement, or system shutdowns.
Preventing BZAL Alarm Errors
- Inspect BZAL cables and connectors regularly
- Maintain proper grounding and shielding
- Avoid routing cables near high-power equipment
- Perform scheduled maintenance checks
- Monitor early warning signs of amplifier or brake unit failure
Related FANUC Alarm Codes
- SRVO-065 – Servo Communication Error
- SRVO-068 – Pulse Mismatch
- SRVO-069 – Pulse Coder Alarm
- SRVO-131 – Encoder Communication Error
These alarms are closely related to servo communication and brake signal issues.
Conclusion
- FANUC Alarm SRVO-062 – BZAL Alarm indicates a fault in the brake signal detection system.
- By inspecting cables, connectors, amplifiers, and brake units, engineers can restore safe motion control and reliable robot operation.
FAQ
Q1: What causes SRVO-062?
Common causes include BZAL cable faults, connector issues, amplifier input failure, or brake unit malfunction.
Q2: Can I reset SRVO-062 and continue running?
Only if the issue is temporary. Persistent alarms require immediate troubleshooting.
Q3: Is SRVO-062 critical?
Yes, as it affects safe axis motion and brake operation.
Q4: How do I fix BZAL errors?
Inspect cables, reseat connectors, and replace faulty amplifiers or brake units as needed.
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