
11.SPINDLE SPEED FUNCTION B-63943EN-1/02
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11.9.3 Arbitrary Reference Position Setting Function
Overview
When bit 0 (CRF) of parameter No. 3700 is set to 1, any position can
be set as the reference position by the first reference position return
command (G28 or a manual reference position return) issued after the
serial spindle enters the Cs contour control mode.
Explanation
When the first reference position return command (G28 or a manual
reference position return) is executed after the serial spindle enters the
Cs contour control mode, a reference position return is performed with
the current position assumed to be the reference position. Therefore,
a spindle movement for positioning at the reference position is not
made.
Since the reference position return operation does not involve
positioning to a spindle position specific to the spindle, the cycle time
can be reduced.
NOTE
1 The spindle position at a reference position set by a
reference position return operation by using this
function is not guaranteed to match the spindle
position at a reference position set by a reference
position return operation performed again after the
Cs contour control mode is turned off then back on.
2 When an intermediate point is specified in G28, a
movement to the intermediate point is made, then
that position is set as the reference position.
3 When this function is used, and a G00 command is
issued for a Cs contour control axis without
performing a reference position return even once
after the serial spindle is placed in the Cs contour
control mode, P/S alarm No. 0303 is issued even if
bit 1 (NRF) of parameter No. 3700 is set to 0. A
reference position return must always be performed
using the G28 command.
4 When this function is used, grid shift at the time of
reference position return (parameter No. 4135) is
invalid.
5 In automatic phase matching of the spindle EGB, if
the master axis is a Cs contour control axis, this
function cannot be used.