Supplementary
Explanation
Constant surface speed control and S4-digit command output:
When constant surface speed control (G96) is specified by the part
program at its execution in the automatic operation mode, the
output is varied evry 100 ms according to the following relation
during a cutting operation:
(Surface speed by S command)
(X-axis current vlaue) x (r’c) x
(1OV)
(Spindle gear range max. speed determined
by GR1 to GR4 inputs
Time Chart Example
1 r-l ----
,“, I -#
S OUT-
1!
!
~––––––+––~
CUTTING
POSITIONING POSl-
CUTTING
EXECUTING COMMAND TIONING EXECUTION
NO. 1
NO. 2
Fig. 19.15
Setting parameter POSG96 (#6020 DO) to” 1“ enables the control to
perform the constant surface speed control also on the posi-tioning
command. (However, only the spindle speed obtained by the
coordinate value of the positioning end point is outputted.)
19.2.36 SPINDLE S COMMAND “O” (SSTP), GEAR
SHIFT ON (GRS) INPUT, AND SPINDLE CONSTANT
SPEED (GSC) INPUT
These inputs are used to make the S4-digit command analog output
provide the outputs other than the part program S command. When
SSTP input is closed, the spindle motor speed command output
based on the spindle speed specified in the part program is stopped.
If GRS input is closed in this state, the voltage to set to
parameter GRSREV (#6270) is outputted.
If GSC input is closed, the spindle motor speed command
voltage is outputted which corresponds to the spindle speed to be
set to parameter GSCREV (#6275) by the spindle gear range input.
Table 19.14
SSTP
GRS
GSC
I
S4-digit Command
Input Input Input
Analog Voltage
o 0 0
0 0 1
Voltage correspondingto
spindle speed commanded
o
1
0
by NC program.
o 1 1
110101 Ov
1
0 1
Voltage correspondingto
parameter GSCREV.
1 1 0
ParameterGRSREVsettingvalue.
111111 Ov
O:Contact open, 1: Contact closed
Notes :
1. It
is possible to make the analog outputs for SSTP, GRS, and GSC
inputs negative by the S4-digit analogoutput invert (SINV) input.
2. The period of time between the setting of SSTP, GRS, or GSC input
and the catching-upof the analog voltage value is shorter than 100ms.
3. Setting parameter SSTPAB (#6020 D,) to 1 enable the control to
provide “XSSTP” input.
19.2.37 SPINDLE SPEED REACHED (SAGR) INPUT
This input is used to inform, in the case of the S4-digit command,
that the spindle speed has reached the specified value at the start of
cutting at the execution of the part program in the automatic ope-
ration mode. At the start of cutting (when switching from a posi-
tioning command to a cutting command takes place), the control
delays the time by the value specified in parameter SAGRT
(#6224), makes sure that SAGR input is closed, and starts cutting.
NOTE
1. To perform the above operation by SAGR input, set parameter SAGRCH
(#6006D4) to “1.“ If it is set to “O,”SAGR input is ignored.
2. In G96 mode, SAGR input is checked every time the switching from a
positioning command to a cutting command takes place. In G97 mode,
SAGR input is checked at the switching only when the spindle speed is
different between the positioning start and end times.
19.2.38 SPINDLE SPEED OVERRIDE (SPA, SPB,
SPC, SPD AND SPE) INPUTS
These inputs are used, in the case of the S4-digit command, to
override the S command in a range of 50% to 120% at the
execution of the part program in the automatic operation mode.
118
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