Applicable Systems
MAZATROL MATRIX
MAZATROL Smooth
INTEGREX
Symptoms
The Mazak CNC control displays a spindle alarm. The spindle may not start, may stop unexpectedly, or may run at incorrect speed.
Possible Causes
- Spindle motor overload
- Spindle drive fault
- Spindle encoder error
- Spindle bearing seizure
- Spindle parameter error
- Wiring harness or connector fault
Troubleshooting Steps
- Step 1: Record the Mazak alarm code 1251 and note the machine operating state
Alarm code and context are documented - Step 2: Access the alarm detail screen on the Mazatrol control for additional information
Detailed alarm information is retrieved - Step 3: Inspect the Spindle subsystem for visible faults, damage, or abnormal conditions
No visible damage or abnormalities found - Step 4: Check parameters, programs, and offsets per the Mazak service manual
Values match expected settings or discrepancies are identified - Step 5: Reset the alarm per the Mazak procedure and test machine operation
Alarm clears and machine operates normally, or alarm returns
How to Reset
To reset Mazak alarm 1251: 1) Resolve the underlying fault per the troubleshooting steps. 2) Press the RESET key on the Mazatrol control panel. 3) If the alarm persists, press EMERGENCY STOP, release it, then press RESET. 4) If still present, power cycle the machine (main breaker off, wait 30 seconds, on). 5) Contact Mazak service if the alarm persists after reboot.
Frequently Asked Questions
- Q: What does Mazak alarm 1251 mean?
Alarm 1251 indicates: Spindle Alarm W-Axis. This is a Mazak MAZATROL control system alarm related to Spindle.
- Q: How do I clear Mazak alarm 1251?
Fix the root cause, press RESET. If persistent, cycle E-STOP and RESET. If still present, power cycle the machine. Contact Mazak service if it returns.
- Q: Is Mazak alarm 1251 critical?
Severity: Major. Reduce operations and service promptly.
Source: Mazak MAZATROL Alarm List / Mazak Service Manual
Category: CNC