
B–62073E–1/042. INTERFACE BETWEEN CNC AND PMC–NA OR NB
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(iii) Example of Assignment
X, Y, Z: Servo axes
C: Spindle contour control axis
Assign the same number for the servo and controlled axes.
Control axis No.
Axis name Servo axis No.
1
2
3
4
X
Y
Z
C
1
2
3
4
(iv) Assignment of axes for the Series 15–TT
The Series 15–TT permits 2–spindle control. When the two spindles are used in spindle contour
control, assign one spindle contour control axis to each head. Two spindle contour control axes
cannot be assigned to one head.
(d) Automatic servo loop gain setting at switching between spindle rotation control and spindle contour
control
(i) Switching from spindle rotation control to spindle contour control
After switching from spindle rotation control to spindle contour control, if the servo loop gains of
the spindle contour control axis and other axes differ, linear or circular interpolation cannot be per-
formed with the spindle contour control axis normally.
Therefore, the servo loop gain (parameter Nos. 3069, 3070, 3071, and 3072) selected by the
clutch/gear signals (CTH1A and CTH2A) is automatically set for the servo axes other than those
subjected to spindle contour control.
(ii) Switching from spindle contour control to spindle rotation control
The original servo loop gain (parameter 1825) should automatically be set for the servo axes.
(iii) Switching between spindle rotation control and spindle contour control during automatic opera-
tion
After switching between spindle rotation control and spindle contour control during automatic op-
eration, an immediate switching of the servo loop gain hampers normal operation. The servo loop
gain should be switched after the block has been completed.
(iv) The servo loop gain is also automatically set when the switching between spindle rotation control
and spindle contour control is reset in operation other than automatic operation or when the mode
is switched.
No switching
(v) When no interpolation is made between the spindle contour control axis and another axis, or the
same servo loop gain is used for both the spindle contour control axis and the servo axis, the gain
need not be changed. In this case, it is necessary to specify so with a parameter (NGC of parame-
ter 5609 = 1).
(vi) Series 15–TT
In the Series 15–TT, only the gain of the servo motor for the head belonging to the spindle contour
control axis is changed.
(e) Relationships with other functions
(i) Operating monitor
No conventional parameter is used for the motor load ratings of the spindle and the spindle con-
tour control axis. Parameter 3127 is used instead. (Normally, this parameter is set automatically
and need not be changed.)
(ii) Remote buffer operation
⋅ Operating by binary format
⋅ In NC format operation, if DNC operation using a remote buffer is set such that high–speed
distribution is performed when possible (DNC of parameter 0000 = 0), leave the spindle
contour control mode before entering the remote buffer operation mode.
Spindle contour control cannot be performed during the remote buffer operation mode. Remote
buffering is possible only in the spindle rotation control mode. Do not switch between spindle con-
tour control and spindle rotation control during the remote buffer operation.
Assign the same number for the
servo and controlled axes.