
4.DESCRIPTION OF PARAMETERS B-64120EN/01
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NOTE
There are two types of compensation: Types A and
B. With the skip function, the current position is
stored in the CNC according to the skip signal.
However, the current position stored in the CNC
contains servo delay. The machine position is
therefore deviated by the servo delay. The
deviation can be obtained from the position
deviation of the servo and the error generated due
to feedrate acceleration/deceleration performed by
the CNC. If the deviation can be compensated, it is
not necessary to include the servo delay in
measurement errors. The deviation can be
compensated with the following two types by the
parameter as follows:
(1) Type A: The deviation is the value calculated
from the cutting time constant and
servo time constant (loop gain).
(2) Type B: The deviation is the error due to
acceleration/deceleration and the
position deviation when the skip
signal goes on.
TSE When the torque limit skip function (G31 P99/98) is used, the skip
position held in a system variable is:
0 : Position that is offset considering the delay (positional deviation)
incurred by the servo system.
1 : Position that does not reflect the delay incurred by the servo
system.
NOTE
The torque limit skip function stores the current
position in the CNC when the torque limit arrival
signal is turned on. However, the current position in
the CNC includes a servo system delay, so that the
position is shifted from the machine position by an
amount corresponding to the servo system delay.
The value of this shift can be determined from the
servo system positional deviation. When TSE is set
to 0, a skip position is determined by subtracting
the positional deviation from the current position.
When TSE is set to 1, the current position
(including the servo system delay) is used as the
skip position, without considering any shift or
position deviation.