
4. DESCRIPTION OF PARAMETERS
B–63840EN/03
64
1620
Time constant T or T
1
used for linear acceleration/deceleration or bell–shaped
acceleration/deceleration in rapid traverse for each axis
[Data type] Word axis
[Unit of data] ms
[Valid data range] 0 to 4000
Specify a time constant used for acceleration/deceleration in rapid tra-
verse. When the optional function of bell–shaped acceleration/decelera-
tion in rapid traverse is provided, bell–shaped acceleration/deceleration is
applied in rapid traverse. If the function is not provided, linear accelera-
tion/deceleration is applied.
(1) When the function is provided, set this parameter to time constant T
1
used in bell–shaped acceleration/deceleration in rapid traverse, and
set parameter No.1621 to time constant T
2
.
(2) When the function is not provided, specify a time constant used in
linear acceleration/deceleration.
NOTE
1 When parameter No.1621 (time constant T
2
used for
bell–shaped acceleration/deceleration in rapid traverse) is
set to 0, linear acceleration/deceleration is applied in rapid
traverse even if the function is provided. In this case, this
parameter stands for a time constant used in linear
acceleration/deceleration in rapid traverse.
2 Depending on the setting value of the time constant, the rate
slightly lower than the rapid traverse rate may be applied for
a given period of time while reaching the rapid traverse rate
after acceleration. To work around this problem, set a
multiple of 8 as the time constant.