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Installation manual
CNC 8055
CNC 8055i
7.
CONCEPTS
SOFT: V02.2X
Reference systems
Considerations
If at the time when the home search is requested, the axis is sitting on the home switch, the axis
will back up (in the direction opposite to the one indicated by "REFDIREC (P33) ") until it is off the
switch and then, it will go on to search home.
If the axis is positioned beyond the software limits "LIMIT+" (P5) and "LIMIT-" (P6), it must be brought
back into the work area (within those limits) and on the proper side for referencing (home searching).
Care must be taken when placing the home switch and when setting feedrates "REFEED1 (P34)"
and "REFEED2 (P35)". The home switch (1) will be installed so the marker pulse (2) will be found
in the zone corresponding to feedrate "REFEED2" (P35). If there is no room for it, reduce the value
of "REFEED1 (P34)". For example, for rotary encoders whose consecutive marker pulses are very
close to each other.
When the selected axis does not have a machine reference (home) switch (axis parameter
DECINPUT (P31) = NO), the CNC will move the spindle at the feedrate set by axis parameter
REFEED2 (P35) until the first marker pulse from the current position is found, thus ending the home
search.
FAGOR linear encoders (scales) provide a negative marker (reference) pulse Io every 50 mm (about
2 inches) and the FAGOR rotary encoders provide one positive reference pulse per revolution.
Do not mistake the type of pulse provided by the feedback system with the value to be assigned
to axis parameter REFPULSE (P32). This parameter must indicate the type of active flank (leading
or trailing edge), positive or negative of the reference mark (Io) used by the CNC.
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