B–63610EN/01
4. DESCRIPTION OF PARAMETERS
77
Set the value when the rapid traverse rate is 100%. If it is under 100%, the
total time is reduced. (Constant acceleration method)
The value of T
1
is determined from the torque of motor. Usually set the
value of T
2
to 24 ms ir 32 ms.
1621
Time constant t T
2
used for bell–shaped acceleration/deceleration in rapid tra-
verse for each axis
[Data type] Word axis
[Unit of data] ms
[Valid data range] 0 to 512
Specify time constant T
2
used for bell–shaped acceleration/deceleration
in rapid traverse for each axis.
NOTE
1 This parameter is effective when the function of bell–shaped
acceleration/deceleration in rapid traverse is provided. Set
parameter No.1620 to time constant T
1
used for
bell–shaped acceleration/deceleration in rapid traverse, and
set this parameter to time constant T
2
.
For details of time constants T
1
and T
2
, see the description
of parameter No.1620.
2 When this parameter is set to 0, linear acceleration/
deceleration is applied in rapid traverse. The setting in
parameter No.1620 is used as a time constant in linear
acceleration/deceleration.
1622
Time constant of exponential acceleration/deceleration or bell–shaped accelera-
tion/deceleration after interpolation, or linear aceeleration/deceleration after
interpolation in cutting feed for each axis
[Data type] Word axis
[Unit of data] ms
[Valid data range] 0 to 4000(exponential acceleration/deceleration in cutting feed)
0 to 512 (linear or bell–shaped acceleration/deceleration after
interpolation in cutting feed)
Set the time constant used for exponential acceleration/deceleration in
cutting feed, bell–shaped acceleration/deceleration after interpolation or
linear acceleration/deceleration after interpolation in cutting feed for each
axis. Except for special applications, the same time constant must be set
for all axes in this parameter. If the time constants set for the axes differ
from each other, proper straight lines and arcs cannot be obtained.
This parameter is valid for threading, irrespective of the
acceleration/deceleration type. For threading cycles G76 and G92 (G78
in the G code system B or C), this parameter is valid for operations other
than exponential acceleration/deceleration. (T series)