
B-63943EN-1/02 11.SPINDLE SPEED FUNCTION
- 1227 -
- Constant Vmaxh (Parameter No. 3752) related to the upper limit
of spindle motor speed (min
-1
) with high-speed gears
(medium-speed gear for 3-stage gear)
Upper limit of spindle motor speed with
high-speed gears
Vmaxh = 4095 ×
Spindle motor speed when the command
voltage is 10V
- 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 (No. 3705#2) =
1), 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.
- Time chart
When S code is commanded, the I/O signal time chart is :
(i) When Gear select signal does not change
To next block
S code read
VL
Spindle speed
command output
0V
VH
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.