Okuma Alarm A-1123 – Safety Speed Monitor Error
Okuma Alarm A-1123 indicates a problem with the machine’s safety speed monitoring system.
This alarm occurs when the CNC control detects an error in the safety speed monitor responsible for supervising spindle or axis speed.
The safety speed monitoring system is an important safety feature designed to ensure that machine components operate within safe speed limits. If the system detects abnormal speed data or fails to verify the correct speed signal, the control triggers Alarm A-1123 to prevent potential damage or unsafe operation.
Possible causes
Several issues may trigger this alarm:
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Failure of the safety speed monitoring circuit
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Incorrect or unstable spindle speed signal
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Faulty encoder or speed sensor
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Wiring or connector problems
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Communication issue between the safety monitor and CNC control
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Internal failure of the monitoring module or control electronics
What happens when this alarm appears
When Alarm A-1123 occurs, the CNC control cannot verify that the spindle or axis speed is within safe limits.
For safety reasons, the machine may stop operation or prevent certain functions until the issue is resolved.
Recommended actions
To troubleshoot this alarm, the following steps are recommended:
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Restart the CNC machine and check whether the alarm reappears.
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Verify spindle speed signals and encoder feedback.
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Inspect cables and connectors related to the speed monitoring system.
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Check machine parameters related to safety speed monitoring.
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If necessary, test or replace the monitoring module or related electronics.
Professional repair service
If the alarm persists, the problem may be caused by a faulty electronic module or damaged sensor.
Our technicians specialize in Okuma CNC electronics diagnostics and repair, including control boards, monitoring modules, and servo system components.
