Installation manual
CNC 8035
5.
CONCEPTS
Reference systems
(SOFT M: V15.3X)
(S
OFT T: V16.3X)
·214·
Gantry axes
Home search on Gantry axes may be carried out in JOG mode or by program. It will be carried out
as follows:
• On axes with no distance-coded feedback system:
The CNC starts the movements of both axes in the direction indicated by a.m.p. REFDIREC
(P33) of the main axis.
These movements will be performed at the feedrate indicated by a.m.p. REFEED1 (P34) for
the main axis until the home switch for this axis is hit.
Then, the home search will start on both axes at the feedrate indicated by a.m.p. REFEED2
(P35) of the main axis.
The CNC will wait until the marker pulse (home) of the slave axis is found and then, it will
look for the marker pulse from the main axis.
If machine parameter I0TYPE=3, the home search procedure is the following:
The CNC starts the movements of both axes in the direction indicated by a.m.p. REFDIREC
(P33) of the main axis.
These movements will be performed at the feedrate indicated by a.m.p. REFEED1 (P34) for
the main axis until the home switch for this axis is hit.
It then moves back at REFEED2 until the home switch is released.
Once the switch has been released, the CNC will wait until the marker pulse (home) of the
slaved axis is found and then, it will look for the marker pulse from the main axis. This is done
without changing the direction or the speed of the movement.
• On axes with distance-coded feedback system:
The CNC starts moving both axes in the direction indicated by a.m.p. REFDIREC (P33) for the
main axis at the feedrate indicated by a.m.p. REFEED2 (P35) of the main axis.
The CNC will wait until the marker pulse (home) of the slave axis is found and then, it will look
for the marker pulse from the main axis.
If the difference obtained between both reference positions is not the same as the one indicated
by a.m.p. REFVALUE (P36) for both axes, the CNC will correct the position of the slave axis. This
will end the home search operation.
When this search is carried out in the JOG mode, the active zero offset will be cancelled and the
CNC will display the position value indicated by a.m.p. REFVALUE (P36) for the main axis. In all
other cases, the displayed position value will be referred to the zero offset (or part zero) active before
the home search.
Gantry axes. Managing two home switches
Managing two home switches is only possible if axis machine parameter I0TYPE (P52) =3.
If both the master and the slave axes have a home switch (a.m.p. DECINPUT (P31) of the master
and slave are YES), the home search will be carried out as follows:
The CNC starts the movements of both axes in the direction indicated by a.m.p. REFDIREC
(P33) of the main axis.
This movement is carried out at the feedrate indicated by a.m.p. REFEED1 (P34) of the main
axis. The axes move until one of them presses its home switch.
If the a.m.p. REFDIREC (P33) of the main axis has been set for a positive direction,
the a.m.p. REFVALUE (P36) of the slave axis must be set to a value lower than that
assigned to the main axis.
Likewise, if the a.m.p. REFDIREC (P33) of the main axis has been set for a negative
direction, the a.m.p. REFVALUE (P36) of the slaved axis must be set to a value
greater than that assigned to the main axis. They must never have the same value.
When encoders are used for feedback, the difference between the values assigned
to a.m.p. REFVALUE (P36) of both axes must be smaller than the pitch of the
ballscrew.
It is recommended that the distance between the marker pulses of both encoders be
half the leadscrew pitch.
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