
B-63530EN/03 4.DESCRIPTION OF PARAMETERS
- 429 -
SEB When a high-speed skip signal goes on while the skip function is used,
acceleration/deceleration and servo delay are:
0 : Ignored.
1 : Considered and compensated (type B).
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.