
B–63503EN–1/01
9. SPINDLE SPEED FUNCTION
378
#7 #6 #5 #4 #3 #2 #1 #0
TCW3706
TCW
CWM
CWM
ORM
ORM GTT
PG2
PG2
PG1
PG1
[Data type] Bit
PG2, PG1 Gear ratio of spindle to position coder
Spindle speed
Number of position coder revolutions
Magnification PG2 PG1
1 0 0
2 0 1
Magnification=
4 1 0
8 1 1
GTT Selection of a spindle gear selection method
0 : Type M
1 : Type T
NOTE
1 Type M:
The gear selection signal is not entered. In response to an
S command, the CNC selects a gear according to the speed
range of each gear specified beforehand in parameters.
Then the CNC reports the selection of a gear by outputting
the gear selection signal. The spindle speed corresponding
to the gear selected by the gear selection signal is output.
Type T:
The gear selection signal is entered. The spindle speed
corresponding to the gear selected by this signal is output.
2 When the constant surface speed control is selected, type
T is selected, regardless of whether this parameter is
specified.
3 When type T spindle gear switching is selected, the
following parameters have no effect:
No. 3705#2 SGB, No. 3751, No. 3752, No. 3705#3 SGT,
No. 3761, No. 3762, No. 3705#6 SFA, No. 3735, No. 3736
However, parameter No. 3744 is valid.
ORM Voltage polarity during spindle orientation
0 : Positive
1 : Negative
TCW, CWM Voltage polarity when the spindle speed voltage is output
TCW CWM
Voltage polarity
0 0 Both M03 and M04 positive
0 1 Both M03 and M04 negative
1 0 M03 positive, M04 negative
1 1 M03 negative, M04 positive