
B–65160E/02
2. FUNCTION EXPLANATION
FANUC AC SPINDLE MOTOR a series
123
PRM No. 65 CZRN=1
If the G00 command is executed when the machine has not
returned to the reference position since switching to the Cs
contouring control mode, the serial spindle performs normal
positioning from its stopped position.
In this case, the reference position is not recognized.
So the G28 command is required to return the machine to the
reference position.
When the machine has been returned to the reference position, the
G00 command recognizes the reference position. A coordinate
system is established, then normal positioning is performed.
G28 command
If G28 is specified after switching to the Cs contouring control
mode, the Cs contouring control axis moves to a middle point.
Reference position return, then positioning at the reference
position are performed. Then, reference position return
completion signal ZP3 (for the T series) or ZP4 (for the M series)
is output.
When the machine has been returned to the reference position,
positioning at the reference position is performed, then reference
position return completion signal ZP3 (for the T series) or ZP4
(for the M series) is output.
(c) Operation after switching to the Cs contouring control mode
Immediately after switching from the spindle rotation control
mode to the Cs contouring control mode is made, the current
position is lost, so it is always necessary to return the machine to
the reference position.
If the coordinate system for the Cs contouring control axis is not
required, however, a corresponding parameter is set so that the
reference position return function is not used. In this case,
movement is allowed without returning to the reference position.
(d) Interruption of return to the reference position
Manual operation mode
Reference position return for the Cs contouring control axis
can be interrupted by reset, emergency stop, or by turning the
axis selection signal to OFF.
In all cases, after the interruption, the reference position
return operation must be performed again from the
beginning.
Automatic operation mode
The reference position return operation for the Cs contouring
control axis can be interrupted by reset, emergency stop or
feed hold.
In all cases, after the interruption, reference position return
operation must be performed again from the beginning.