Okuma Alarm A-1133 – VDU Detected Error
Okuma Alarm A-1133 indicates a problem with the VDU (Vibration Detect Unit).
This alarm appears when the VDU system can no longer correctly detect or process acceleration data from the machine.
The VDU (Vibration Detect Unit) is responsible for monitoring vibration levels of the spindle or machine structure. It helps detect abnormal vibration conditions that could indicate tool problems, spindle issues, or mechanical instability.
When the system cannot receive valid acceleration data, the control triggers Alarm A-1133.
Possible causes
Several issues can lead to this alarm:
-
Failure of the VDU (Vibration Detect Unit)
-
Faulty acceleration or vibration sensor
-
Broken or loose sensor cable
-
Communication problem between the VDU and the CNC control
-
Power supply problem to the VDU module
-
Internal electronic failure of the VDU board
What happens when this alarm appears
When Alarm A-1133 is triggered, the CNC control detects that vibration monitoring is not functioning correctly.
In some machines this may stop certain machining operations or disable vibration monitoring features to prevent possible damage.
Recommended actions
To troubleshoot this alarm, the following steps are recommended:
-
Restart the CNC machine and check if the alarm reappears.
-
Inspect the vibration sensor and its wiring.
-
Check the connection between the VDU unit and the CNC control.
-
Verify that the VDU module is receiving proper power.
-
If necessary, test or replace the VDU board.
Professional repair service
If the problem persists, the issue may be caused by a faulty electronic module.
Our technicians specialize in Okuma CNC control electronics diagnostics and repair, including VDU modules, control boards, and servo electronics.
