Okuma Alarm A-8634 – ATC Shutter Open/Close Condition

Alarm A 8634 is triggered when the control system attempts to open or close the ATC (Automatic Tool Changer) shutter but the operation cannot be executed. The machine detects that the shutter position or feedback signal does not allow the commanded movement.

Possible causes include mechanical blockage, sensor or limit switch failure, incorrect shutter position detection, or a malfunction in the ATC control system.