1774

Common Causes

• Program error - M117 commanded while the spindle is still running (e.g. M03 S5000 immediately followed by M117)
• Operation error - turret or another unit moved manually away from the required position before gauging
• Interlocked equipment (tailstock, parts catcher, work rest, loader, deburring unit, etc.) not at its required retract/travel end position
• Faulty EC input signal, e.g. parts catcher retract-end confirmation (I/O check NO.51 INPUT bit9, iPCBA)

Troubleshooting Steps

1. 1Read the code number shown with the alarm: code 1 = Spindle stop requirements not met (zero speed, stop signal ON, rotation signal OFF); code 2 = Tailstock spindle not at retract end (center work spec); code 3 = Chuck not unclamped; code 4 = Interlocked equipment not at retract position; code 5 = Turret not at Z-axis travel end; code 6 = Workpiece present signal turned ON while head was advancing; code 7 = Tool gauging arm not at advance end; code 8 = Robot-inside-NC-lathe signal ON (robot spec)
2. 2Read the code on screen - it names the exact blocking condition. Fix that condition, then re-issue M117/M118.
3. 3Code 1: make sure the spindle is fully stopped before commanding the sensor head - spindle zero-speed signal ON, spindle stop signal ON, rotation signal OFF. Add a dwell or M05 before M117 in the program.
4. 4Code 2/3/15/16: retract the tailstock spindle to its end (center work spec), unclamp the chuck, open the sub-spindle chuck, or move the sub spindle to the W-axis travel end as applicable.
5. 5Codes 5/26/32/41: move the turret to the Z-axis (or XA/XB) travel end or home position 1, and clear any ZA/ZB interference position before advancing the head.
6. 6Codes 4/7/10/11/12/13/19/20/21/31/33/35: bring the named equipment (interlocked device, gauging arm, work rest, temporary stand, parts catcher, loader, work pusher, deburring unit, unload carrier, coiling prevention, APC arm) to its required retract/advance end and verify its confirmation input is ON.
7. 7Codes 8/9/17/40: clear the robot/loader-inside signal, close the machine door or maintenance door before commanding the head.
8. 8Codes 14/18/23/29/30: stop C-axis or M-tool spindle rotation, turn coolant off, or complete spindle orientation to the required angular position.
9. 9Code 34 (dual palm type): keep both palm buttons pressed for the entire advance/retract stroke; releasing either one raises this alarm.
10. 10If the condition appears satisfied but the alarm persists, check the corresponding EC input signal in the I/O monitor (e.g. NO.51 INPUT bit9 for parts catcher retract end) for a faulty switch or wiring.