
B–63173EN–1/01
9. SPINDLE SPEED FUNCTION
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In addition, for the speed command output to the spindle motor, analog
voltages 0 to 10 V for analog spindle control correspond to digital data
0 to 16383 for serial spindle control. However, it might be easier if you
consider them code signals from 0 to 4095 for convenience sake without
distinguishing between serial and analog spindles.
Assume that gear switching is two stage switching. If the spindle speed
with the output voltage 10 V is 1000 rpm for the low speed gear (G1) and
2000 rpm for the high speed gear (G2), set these speeds by the parameter
No. 3741, 3742. In this case, the analog voltage has the linear relationship
shown below.
When gear
2 selected
When gear
1 selected
Volt
0
V
2
V
1
10
600rpm
1000rpm
2000rpm
N
When spindle speed S=600 is given, V
1
(for G1) or V
2
(for G2) is
calculated inside the CNC and output to the machine side.
V
1
: 6(V)
V
2
: 3(V)
The value of output voltage V is calculated automatically from the
following equations:
V=
10N
R
R: Spindle speed at 10V output voltage
N: Spindle speed given by S5-digits
This is equivalent to the G97 mode for constant surface speed control.
See Section 9.4 for operations during the constant surface speed control
mode (G96).
In addition, parameter No. 3772 (upper limit to the spindle speed) can
specify speed clamping for all gear positions.