
4.DESCRIPTION OF PARAMETERS B-64120EN/01
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List of parameters for control of serial interface spindle Cs contouring control axis
No. Data
type
Description
3920
3921
3922
3923
3924
Byte
Word
Word
Word
Word
Third
group
Number of the servo axis whose loop gain is to be changed according to the set values of
parameters 3921 to 3924 when the Cs contouring axis is controlled (set values 0 to 8)
Loop gain for the servo axis when the Cs contouring axis is controlled for spindle gear 1
selection
Loop gain for the servo axis when the Cs contouring axis is controlled for spindle gear 2
selection
Loop gain for the servo axis when the Cs contouring axis is controlled for spindle gear 3
selection
Loop gain for the servo axis when the Cs contouring axis is controlled for spindle gear 4
selection
<Setting method>
First, select servo axes which perform interpolation with the Cs
contouring axis. (Up to three axes can be selected.)
When there is no servo axis for interpolation with the Cs contouring
axis, set the parameters 3900, 3910, and 3920 to 0 to terminate
parameter setting.
When there are servo axes for interpolation with the Cs contouring
axis, the parameters must be set according to the procedure below for
each axis.
(1) Set the number of a servo axis (1 to 4) for interpolation with the
Cs contouring axis in parameters 39n0 (n = 0, 1, and 2).
(2) Set loop gain values of the servo axis specified in (1) above
which is used when the Cs contouring axis is controlled in
parameters 39n1, 39n2, 39n3, and 39n4. (There are four stages
for main gears used.)
(3) When the number of specified servo axes is less than 3, set the
remaining parameters (39n0) to 0 to terminate parameter setting.
When the number of a Cs contouring axis is set to parameter 39n0, the
parameter is assumed to be set to 0.
NOTE
1 In general, it is difficult to set a high loop gain for a spindle motor axis when
compared with a servo axis. These parameters are provided so that, by changing
the loop gain of a servo axis that requires interpolation with the Cs contour axis,
interpolation control can be exercised correctly between the Cs axis and servo axis
while the spindle exercises Cs contour control.
2 The loop gain of the servo axis is changed using the parameter settings made for a
spindle gear selected at the time of conversion from the spindle mode to the Cs
contour control mode.
In normal use, it is unlikely that the gear of the spindle is switched during Cs
contour control. However, note that if the gear of the spindle is changed during Cs
contour control, the loop gain of the servo axis is not changed.
3 Even when multiple Cs axes are used (bit 7 (CSS) of parameter No. 3704 = 1),
these parameters are shared.