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Setting of acceleration/deceleration time and acceleration/ deceleration pattern
4.7 Setting of acceleration/deceleration time and acceleration/
deceleration pattern
4.7.1
Setting of the acceleration and deceleration time
(Pr. 7, Pr. 8, Pr. 20, Pr. 44, Pr. 45)
Purpose
Parameter that should be Set
Refer to Page
Motor acceleration/deceleration time
setting
Acceleration/deceleration
times
Pr. 7, Pr. 8, Pr. 20, Pr. 44, Pr. 45
Starting frequency
Starting frequency and start-
time hold
Pr. 13, Pr. 571
Set acceleration/deceleration pattern
suitable for application
Acceleration/deceleration
pattern
Pr. 29
Used to set motor acceleration/deceleration time.
Set a larger value for a slower speed increase/decrease or a smaller value for a faster speed increase/decrease.
For the acceleration time at automatic restart after instantaneous power failure, refer to
Pr. 611 Acceleration time at a
restart (page 137).
Parameter
Number
Name
Initial Value
Setting
Range
Description
7
Acceleration time
3.7K or lower
5s
0 to 3600s
Motor acceleration time.
5.5K and 7.5K
10s
11K and 15K
15s
8
Deceleration time
3.7K or lower
5s
0 to 3600s
Motor deceleration time.
5.5K and 7.5K
10s
11K and 15K
15s
20
Acceleration/
deceleration
reference frequency
60Hz
1 to 400Hz
Frequency that will be the basis of
acceleration/deceleration time.
As acceleration/deceleration time, set the
frequency change time from stop to
Pr. 20
.
44
Second acceleration/
deceleration time
3.7K or lower
5s
0 to 3600s
Acceleration/deceleration time when the RT
signal is ON.
5.5K and 7.5K
10s
11K and 15K
15s
45
Second deceleration
time
9999
0 to 3600s
Deceleration time when the RT signal is ON.
9999
Acceleration time = deceleration time
∗1
The above parameters can be set when
Pr. 160 Extended function display selection
= "0".
(1) Acceleration time setting
(Pr. 7, Pr. 20)
Use
Pr. 7
Acceleration time
to set the acceleration time required to reach
Pr. 20
Acceleration/deceleration reference frequency
from 0Hz.
Set the acceleration time according to the following formula.
Acceleration
time setting
=
Pr. 20
×
Acceleration time from stop to maximum
operating frequency
Maximum operating
frequency -
Pr. 13
Example) How to find the setting value for
Pr.7
when increasing the output
frequency to the maximum frequency of 50Hz in 10s with
Pr.20
= 60Hz
(initial setting) and
Pr.13
= 0.5Hz.
Pr. 7
=
60Hz
×
10s
12.1s
50Hz - 0.5Hz
Running
frequency
Acceleration time
Pr. 7, Pr. 44
Deceleration time
Pr. 8, Pr. 45
Time
Pr. 20
(60Hz)
(Hz)
Output
frequency
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