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Setting of acceleration/deceleration time
and acceleration/deceleration pattern
4
4.8 Setting of acceleration/deceleration time and 
acceleration/deceleration pattern
4.8.1
Setting of the acceleration and deceleration time (Pr.7, Pr.8, Pr.20, Pr.21, 
Pr.44, Pr.45, Pr.147, Pr.791, Pr.792)
Purpose
Parameter that must be set
Refer to page
Motor acceleration/deceleration time 
setting
Acceleration/deceleration times
Pr.7, Pr.8, Pr.20, Pr.21, 
Pr.44, Pr.45, Pr. 147, Pr.791, 
Pr.792
Starting frequency
Starting frequency and start-
time hold
Pr.13, Pr.571
Set acceleration/deceleration pattern 
suitable for application
Acceleration/deceleration 
pattern and backlash measures
Pr.29, Pr.140 to Pr.143
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 (refer to page 162).
Parameter 
Number
Name
Initial Value
Setting Range
Description
7
Acceleration time
7.5K or lower
5s
0 to 3600/ 360s 
*2
Set the motor acceleration time.
11K or higher
15s
8
Deceleration time
7.5K or lower
10s
0 to 3600/ 360s 
*2
Set the motor deceleration time.
11K or higher
30s
20
 
*1
Acceleration/
deceleration 
reference frequency
60Hz 
*3
1 to 400Hz
Set the frequency that will be the basis of 
acceleration/deceleration time. 
As acceleration/deceleration time, set the 
frequency change time from stop to Pr. 20.
21
 
*1
Acceleration/
deceleration time 
increments
0
0
Increments: 0.1s
Range: 0 to 3600s
Increments and setting 
range of acceleration/
deceleration time 
setting can be 
changed.
1
Increments: 0.01s
Range: 0 to 360s
44
 
*1
Second 
acceleration/
deceleration time
5s
0 to 3600/360s
 *2
Set the acceleration/deceleration time when 
the RT signal is on.
45
 
*1
Second 
deceleration time
9999
0 to 3600/360s
 *2
Set the deceleration time when the RT 
signal is on.
9999
Acceleration time = deceleration time
147
 
*1
Acceleration/
deceleration time 
switching 
frequency
9999
0 to 400Hz
The frequency where the acceleration/
deceleration time switches to the time set in 
Pr.44 and Pr.45.
9999
No function
791
Acceleration time in 
low-speed range
9999
0 to 3600/360s
Acceleration time in the low-speed range 
(rated motor frequency/10 or lower) is set.
9999
The acceleration time set in 
Pr.7
 is applied.
792
Deceleration time in 
low-speed range
9999
0 to 3600/360s
Deceleration time in the low-speed range 
(rated motor frequency/10 or lower) is set.
9999
The deceleration time set in 
Pr.8
 is applied.
*1
The parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 201)
*2
Depends on the Pr. 21 Acceleration/deceleration time increments setting. The initial value for the setting range is "0 to 3600s" and the setting
increments is "0.1s".
*3
Performing IPM parameter initialization changes the settings. (Refer to page 80)
POINT
Setting  Pr.999 Automatic parameter setting to "30" or "31" changes the setting increments of acceleration/
deceleration time. (Refer to page 290)
IPM
IPM
IPM
IPM
IPM
IPM