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Setting the Acceleration/Deceleration Time Chapter 5-6
5-6 Setting the Acceleration/Deceleration Time
The following description provides information on parameters related to
acceleration and deceleration time settings.
Trapezoidal and S-shape acceleration and deceleration are available. Using
the Sshape characteristic function for acceleration and deceleration can
reduce shock to the machinery when stopping or starting.
Setting the Acceleration/Deceleration Time (n16 through n19)
• Two acceleration times and two deceleration times can be set.
• The acceleration time is the time required to go from 0% to 100% of the
maximum frequency and the deceleration time is the time required to go
from 100% to 0% of the maximum frequency. The actual acceleration or
deceleration time is obtained from the following formula.
Acceleration/Deceleration time =
(Acceleration/Deceleration time set value)
× (Frequency reference value) ÷ (Max. frequency)
Acceleration time 2 and deceleration time 2 are enabled by setting 11 for
acceleration/deceleration time selection in any of the n36 through n39
parameters for multi-function input.
• Deceleration time 2 is also enabled by emergency-stop settings 19, 20,
21, and 22 in any of the n36, n37, n38, and n39 parameters for multi-
function input with n04 for interruption mode selection set to 0 (i.e.,
deceleration stop).
Note Values will be set in 0.1-Hz increments if the frequency is less than 100 Hz
and 1-Hz increments if the frequency is 100 Hz or over.
n16 Acceleration time 1 Changes during
operation
Yes
Setting
range
0.0 to 999 (s) Unit of
setting
0.1 s
(see note)
Default setting 10.0
n17 Deceleration Time 1 Changes during
operation
Yes
Setting
range
0.0 to 999 (s) Unit of
setting
0.1 s
(see note)
Default setting 10.0
n18 Acceleration Time 2 Changes during
operation
Yes
Setting
range
0.0 to 999 (s) Unit of
setting
0.1 s
(see note)
Default setting 10.0
n19 Deceleration Time 2 Changes during
operation
Yes
Unit of
setting
0.0 to 999 (s) Unit of
setting
0.1 s
(see note)
Default setting 10.0
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