
B–63833EN–1/02
9. SPINDLE SPEED FUNCTION
440
· Spindle speed A (Parameter No.3741) (min
–1
) with low-speed gears
when the command voltage is 10V
· Spindle speed B (Parameter No.3742) (min
–1
) with high-speed gears
when the command voltage is 10V (medium-speed gear for 3-stage)
· Spindle speed C (Parameter No.3743) (min
–1
) with high-speed gears
when the command voltage is 10V (3-stage gear)
Spindle motor speed commands (0 to 10V) and gear selecting signals
(GR1O, GR2O, GR3O) are issued on each S code command as shown in
the figure:
CAUTION
1 In a tapping cycle when parameter SGT (No. 3705 #3 ) is
set, the gears are changed over at the gear changing point
for tapping.
2 For this function (parameter SGB=1 (No. 3705#2)), when
only one-stage gear is used, the voltage corresponding to
the upper limit value to the spindle motor is calculated using
Vmaxl, and when 2-stage gear is used, it is calculated
according to Vmaxh. Therefore, when SGB is 1, set Vmaxl
when only one-stage gear is used, Vmaxl and Vmaxh when
2-stage gear is used.
When S code is commanded, the I/O signal time chart is :
D When Gear select signal does not change
To next block
S code read
V
L
Spindle speed
command output
0V
V
H
Fig. 9.3 (d) Time chart when gear select signal does not change
In this case, the SF signal is not output and the CNC advances to the next
block automatically after the next spindle speed command is output.
D Time chart