What causes FANUC alarm 5064?

Machine system or function indicated by the alarm name has detected a fault. Control parameter or configuration error related to the alarm condition. Hardware component fault on the CNC or machine. Part program error or illegal operation for the indicated function. Machine interlock or safety condition not satisfied.

How do I fix FANUC alarm 5064?

1. Note the alarm number and check the Fanuc alarm screen for any sub-code or additional details. 2. Identify the specific machine system or function from the alarm name. 3. Power cycle the machine to clear transient faults. 4. Consult the Fanuc parameter or operator manual for alarm 5064 specific remedy. 5. Contact Fanuc service if the alarm persists after basic troubleshooting.

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FANUC Controller

System · Intermediate · 30-60 minutes

Alarm 5064

Fanuc Alarm 5064 - DIFFERENT AXIS UNIT (IS-B, IS-C)

Alarm 5064 occurs when there is a mismatch in axis unit configuration between IS-B (αi series servo) and IS-C (βi series servo) amplifier types within the same system. This typically happens during mixed amplifier installations, parameter restoration after hardware changes, or incorrect parameter settings in IS-B/IS-C mixed servo configurations where unit settings must be consistent across all axes.

FANUCSystemIntermediate30-60 minutes

5064

Fanuc Alarm 5064 - DIFFERENT AXIS UNIT (IS-B, IS-C)

SYSTEM ALARM 5064

Root Cause Summary

Alarm 5064 occurs when there is a mismatch in axis unit configuration between IS-B (αi series servo) and IS-C (βi series servo) amplifier types within the same system. This typically happens during mixed amplifier installations, parameter restoration after hardware changes, or incorrect parameter settings in IS-B/IS-C mixed servo configurations where unit settings must be consistent across all axes.

Causes and Fixes

1
Navigate to SYSTEM > PARAM and check parameter 1022 (unit type) for all axes. Verify IS-B axes (typically older αi amplifiers) and IS-C axes (βi amplifiers) have matching unit settings (0=metric, 1=inch).
2
Check parameter 1006#0 (IS-C specification) and parameter 1815 (servo specification) to confirm which axes are configured as IS-B versus IS-C. Cross-reference with physical amplifier models installed.
3
If mixing amplifier types, ensure parameter 8132 (reference counter unit) and parameter 1820 (position detector setting) are consistently configured across all axes with compatible resolution settings.
Changing unit parameters requires careful recalibration of pitch error compensation and reference position data
4
After correcting unit parameters, perform SYSTEM > PARAM write, power cycle the entire system, and verify via DIAGNOSIS > SERVO to confirm all axes show consistent unit configuration without alarm recurrence.

DIY Feasiblemedium confidence

Call a technician if:

·Software version conflicts detected
·Multiple parameter changes required
·Servo drive hardware replacement needed

Prevention

Always verify parameter compatibility when mixing IS-B and IS-C axes
Document axis unit settings before servo drive replacements
Use consistent unit systems throughout machine configuration

Common Mistakes

Assuming all axes use same unit parameters
Not checking servo drive internal parameters
Mixing metric and imperial units between encoder types

Related Alarms

5063 5065 401 414

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