1741

Common Causes

• Operation error: rotation commanded before closing the chuck (codes 1, 3)
• Faulty chuck close limit switch or incorrect dog position causing the close signal to drop (codes 2, 4)
• Locater not at retract end or its retract signal lost during rotation (code 13)
• Chuck close, face driver, finger/collet chuck, or air chuck clamp signal lost during spindle, M-tool, or C-axis rotation

Troubleshooting Steps

1. 1Read the code number shown with the alarm: code 1 = Spindle rotation commanded with the chuck open; code 2 = Chuck close signal turned OFF during spindle rotation; code 3 = M-tool spindle rotation commanded with the chuck open; code 4 = Chuck close signal turned OFF during M-tool spindle rotation; code 7 = Spindle rotation commanded while the tailstock was being unclamped; code 8 = Spindle chuck was unclamped during spindle rotation; code 9 = Spindle speed exceeded the parameter-set limit with ceiling door open and a chuck interlock release pending; code 10 = Spindle speed exceeded the parameter-set limit with front door open and a chuck interlock release pending (optional release types)
2. 2Read the code shown with the alarm: codes 1/3 mean rotation was commanded with the chuck open; codes 2/4 mean the chuck close signal was lost during rotation.
3. 3For codes 1 or 3: close the chuck first, then re-issue the spindle or M-tool spindle rotation command.
4. 4For codes 2 or 4: check the chuck close limit switch and its dog. Actuate the chuck and watch the close signal on the I/O monitor; if the signal flickers or never sets, adjust the dog position or replace the limit switch.
5. 5For code 13: retract the locater fully to its retract end before commanding spindle rotation, and verify the locater retract signal stays ON.
6. 6For the other codes (face driver, finger/collet chuck, tailstock chuck, front/rear air chuck), confirm the named device is actually clamped/retracted and that its confirmation switch input is steady during rotation.
7. 7If it returns after these checks, record the alarm number, code and object and contact Okuma service.