Installation manual
CNC 8035
CONCEPTS
Reference systems
5.
(SOFT M: V15.3X)
(S
OFT T: V16.3X)
·213·
5.6.1 Home search
With this CNC, home search may be performed in jog mode or by program. Home search may be
carried out on one axis at a time or on several axes at the same time.
When this search (with or without distance-coded Io) is carried out in JOG mode, the active zero
offset will be cancelled and the CNC will display the position values indicated by a.m.p. REFVALUE
(P36). In all other cases, the active part zero will be maintained and the CNC will display the position
values with respect to that part zero.
• On axes with no distance-coded feedback system:
The CNC moves all selected axes that have a home switch in the direction indicated by a.m.p.
REFDIREC (P33).
This movement will be carried out at the feedrate established by a.m.p. REFEED1 (P34) until
the home switch is hit.
Once all the axes have reached their respective home switches, the machine reference
search (marker pulse) will be performed moving the selected axes one by one and in the
selected sequence.
This second movement will be carried out at the feedrate established by a.m.p. REFEED2
(P35) for each axis until the marker pulse of the feedback system is found.
If machine parameter I0TYPE (P52) =3, the home search procedure is the following:
The CNC moves all selected axes that have a home switch in the direction indicated by a.m.p.
REFDIREC (P33).
This movement will be carried out at the feedrate established by a.m.p. REFEED1 (P34) until
the home switch is hit.
Once all the axes have reached their respective home switches, the axes move back one
at a time in the selected order and at REFEED2 until the switch is released.
Once it has released it, it will recognize the first reference mark found without changing either
its moving direction or its feedrate.
• On axes with distance-coded feedback system:
Home switches are no longer necessary since the axes may be homed anywhere along its travel.
However, a.m.p. REFVALUE (P36) must be set when operating with leadscrew error
compensation.
The home search will be performed on one axis at a time and in the selected sequence.
The axes will move a maximum of 20 mm or 100 mm in the direction set by a.m.p. REFDIREC
(P33) at the feedrate set by a.m.p. REFEED2 (P35).
If, during the home search, the home switch is pressed (if any), the CNC will reverse the homing
direction.
If after the machine is all set up it is necessary to remove the feedback system, it may
happen that when it is reinstalled, its marker pulse is no longer at the same physical
location as it was before.
In that case, the distance (shift) between the previous marker pulse location and the
current one must be assigned to a.m.p. REFSHIFT (P47) of the affected axis in order
for the machine reference point (home) to remain the same.
This way, when searching home, the axis will move this additional distance, indicated
by a.m.p. REFSHIFT (P47) value, after finding the new marker pulse of the feedback
system. This movement is carried out at the feedrate indicated by a.m.p. REFEED2
(P35).
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