
B–63503EN–1/01
9. SPINDLE SPEED FUNCTION
368
Reference→ Block Diagram for Analog Voltage Output
min
–1
/10V
X–axis pres-
ent value
Power magnetics cabinet
Gear change command
Speed
control
D-A
converter
Constant
surface
speed control
Motor speed conversion
Full scale conversion
Gear change
r
[Surface speed]
S(m/min)
M code
CNC
GR1, GR2
gear select signal
(contact)
Spindle motor
SF signal is not sent.
Parameter
SVC
G96
G97
S (min
–1
)
When the constant surface speed control is used.
Spindle speed
command
Using the above processing for gear change, the CNC calculates the speed
command output to the spindle motor that is necessary to obtain the
specified spindle speed with the gear.
For either serial spindle or analog spindle control, the calculation results
are output as the S12 bit code signal from 0 to 4095 to the PMC.
(R12O to R01O<F037#3 to F036#0>)
After the calculation results are received, the SIND signal <G033#7>
determines which is to be used, the speed command output calculated by
the CNC or the data specified in the PMC. Thus speed command output
control for the spindle motor is determined. (See also Section 15.4.)
The speed command output to the spindle motor is determined as
described above, but the actually used output polarity is determined by the
CNC as follows:
⋅ If bit 7 (TCW) of parameter No. 3706 = 0
→ Determined according to bit 6 (CWM) of parameter No. 3706
⋅ If bit 7 (TCW) of parameter No. 3706 = 1
→ Determined according to bit 6 (CWM) of parameter No. 3706 and
M03/M04 given to the CNC
After that, the SSIN signal <G033#6> determines which is to be used, the
output polarity calculated by the CNC or the polarity specified in the
PMC. In this way, the output polarity of the speed command output to
the spindle motor is determined. (See also Section 15.4.)
D Determination of output
R12O–R01O (Output)
R12I–R01I (Input)
SIND (Input)
D Determination of output
polarity SSIN/SGN (Input)