NCT Group 2000M, 99M manual Parametric Overtravel Positions

19 Safety Functions

limit data of coordinates specified for that axis will limit the movement by stopping the tip of the tool at the limit. If, however, the compensation is not set up, the reference point of the tool holder will not be allowed into the prohibited area. It is advisable to set the border of the forbidden area at the axis of the tool for the longest one.

–Programable stroke check function is not available for the additional axes.

–Instructions G22, G23 have to be specified in independent blocks.

–Programable stroke check function will be effective after reference point return.

–If the machine enters a prohibited area after reference-point return or as a result of programming G22, and the area is prohibited internally, the prohibition has to be released in manual mode by programming G23; the axis/axes must be moved out by manual jog, and stroke check has to be set up again by programming G22. In the case of an externally forbidden area, the procedure of leaving the area will be the same as the one following an overtravel.

–If an axis reaches the border of the prohibited area in motion, it can be removed from it by manual movement (in one of the manual modes).

–The entire space is allowed if X=I, Y=J, Z=K and E=0.

–The entire space is prohibited if X=I, Y=J, Z=K and E=1.

–If the area is prohibited internally, and the axes reach the prohibited area or a border thereof, the control will return the error message 1400 INTERNALLY FORBIDDEN AREA.

–If the area is prohibited externally, and the axes reach the prohibited area or a border thereof, the control will return the error message FORBIDDEN AREA t+ or FORBIDDEN AREA t– where t is the name of axis.

19.2 Parametric Overtravel Positions

Using the parameters of the control, the machine-tool builder can define for each axis the overtravel positions that is the stroke limit permissible with the particular machine. As soon as the border of that area is reached, the control will return an error message as if it had run over a limit switch.

SParametric overtravel function is only performed by the control after reference

point has been returned.

SThe parametric overtravel function will

prohibit always an external area.

S The areas of programmed stroke check and that of overtravel functions may overlap.

Fig. 19.2-1

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