Alarm 1749..

[Scotty27]

Spindle will not run I have set the tail sock parameter to centre work.
Tail stock is retracted spindle will not start.

Is there another parameter that needs to be set that I have missed?

i do have a M156 at the start of my program prior to the my g97 s 400 m03

[underthetire]

Yes, if your in center work, with the tailstock retracted, you must command a tailstock interlock release. I THINK it was M157, but been 10+ years.

[Thawk53]

Underthetire is correct.

M156: Center work interlock On.
M157: Center work interlock Off.

Insert M157 in your program prior to turning the spindle on. This will allow the spindle to run without engaging the tailstock.

Rick