1260

Common Causes

• M188/M189/G152 commanded while the spindle is rotating or a rotation command is active
• Center work mode not selected before the tailstock command
• Tailstock spindle not at retract end or turrets not at + stroke end
• Tailstock chuck clamp/unclamp state conflicting with the connect/disconnect signals

Troubleshooting Steps

1. 1Read the code number shown with the alarm: code 1 = M188/M189/G153 given while spindle not at zero speed; code 2 = M188/M189/G153 given while spindle not at a standstill; code 3 = M188/M189/G152 given while a spindle rotation command is active; code 4 = Command given while center work is not selected; code 5 = Tailstock spindle not at retraction end; code 6 = Turrets not at positive stroke end; code 7 = Connect and disconnect confirmation signals both ON or both OFF; code 8 = Connect ON key pressed with spindle not at standstill
2. 2Read the code on screen and correct the matching condition: Code 1/2/3 - stop the spindle (M5) and confirm zero speed before M188/M189/G152; Code 4 - select center work mode first.
3. 3Code 5 - retract the tailstock spindle fully to its retraction end; Code 6 - send the turrets to the positive stroke end before the command.
4. 4Code 7 - check the tailstock connect and disconnect confirmation signals; they must not be both ON or both OFF, so inspect those limit switches/proximity switches.
5. 5Code 8-11 (connect ON key pressed) - ensure spindle at standstill, XA-axis at + travel end, tailstock at retract end, and tailstock unclamped before pressing connect.
6. 6Code 12-14 - verify the tailstock chuck clamp/unclamp state and the disconnection confirmation signal agree with the commanded operation; do not issue a chuck clamp while the disconnect confirmation is OFF.
7. 7Code 15-18 - for NC tailstock, only command G02/G03/G30-G35 or non-W/Z axis moves with the tailstock clamped; W-axis moves require XA at + limit, tailstock spindle retracted, tailstock unclamped, and main spindle stopped.