
B–64113EN–1/01
9. SPINDLE SPEED FUNCTION
575
After the serial spindle is switched from spindle speed control to Cs
contour control mode, the current position is undefined. Return the
spindle to the reference position.
The reference position return of the Cs contour control axis is as follows:
- In manual mode
After the serial spindle enters the Cs contour control mode, move
the spindle in the direction of the reference position by turning on
the feed axis and direction select signal (+Jn (G100) or –Jn (G102)).
The spindle starts the movement to the reference position; when it
reaches that position, the reference position return completion
signal ZPn <F094> turns to “1”.
Turning any feed axis and direction select signal to “1” moves the
tool in the reference position direction.
- In the automatic mode
After the serial spindle enters the Cs contour control mode, the
spindle returns to the reference position when G28 is specified.
Under certain conditions, the G00 command returns the spindle to
the reference position, depending upon the setting of parameter
NRF no. 3700#1:
(i) G00 command
Returning to the reference position using the G00 command
differs from using the G28 command or the manual method.
The serial spindle can be positioned at any point using the
G00 command, while the latter two methods always return the
serial spindle to the reference position.
When parameter NRF no. 3700#1 is “0” and the serial spindle
is put in the Cs contour control mode, if the G00 command is
given before returning the spindle to the reference position,
the serial spindle returns to the reference position and indexes
it before moving to the commanded position. After
positioning at the reference position, the reference position
return completion signal ZPn <F094> turns to “1”. When the
G00 command is issued after the serial spindle has returned
to the reference position at least once, normal positioning
operation is executed.
(ii) G28 command
After the serial spindle is put in the Cs contour control mode,
issuing the G28 command stops the spindle motor, then
moves the spindle to the midpoint. The spindle then returns
to the reference position. At this point, the reference position
return completion signal ZPn <F094> turns to “1”. When the
serial spindle has returned to the reference position once while
in the Cs contour control mode, the G28 command positions
the spindle at the reference position without moving to the
midpoint and ZPn comes on.
Reference Position
Return of Cs Contour
Control Axis