
B–63833EN–1/02
9. SPINDLE SPEED FUNCTION
437
The speed commands output to the spindle motor are as follows:
⋅ For the serial spindle, the speed commands are processed as values 0 to
16383 between the CNC and spindle control unit.
⋅ For the analog spindle, the speed commands are output to the analog
voltage signal SVC as analog voltages 0 to 10 V.
The following descriptions exemplify the analog spindle. However, they
can be applied to the serial spindle on the assumption that spindle motor
speed with analog voltage 10 V corresponds to the maximum spindle
motor speed.
D M type gear change method A (Fig. 9.3 (a))
(GR3O)
GR2O
(GR2O)
GR1O
(GR1O)
10V
A
B
C
C×
Vmax
4095
B×
Vmax
4095
A×
Vmax
4095
A×
Vmin
4095
Spindle motor speed command
(Analog voltage command)
Upper limit of
spindle speed
(Vc)
Spindle speed
command
(S code input)
For gear 2-stage
( ) for gear 3-stage
Fig. 9.3 (a) S code input and output voltage
Set the following values as parameters:
· Constant Vmax: for upper limit of spindle speed (parameter No. 3736)
Vmax=4095×
Upper limit of spindle speed
Spindle speed at command voltage 10V
· Constant Vmin; for lower limit of spindle speed (parameter No. 3735)
Vmin=4095×
Lower limit of spindle speed
Spindle speed at command voltage 10V
· Spindle speed A (min
–1
) ; at command voltage 10V and low gear
(parameter no. 3741)
· Spindle speed B (min
–1
) ; at command voltage 10V and high gear (or
middle-high gear) (parameter no. 3742)
· Spindle speed C (min
–1
) ; at command voltage 10V and high gear
(parameter no. 3743)