87
Setting of acceleration/deceleration time and acceleration/ deceleration pattern
4
PARAMETERS
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, Pr. 791, Pr. 792)
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,
Pr. 791, Pr. 792
87
Set the minimum motor speed Starting speed Pr. 13
89
Set acceleration/deceleration pattern
suitable for application
Acceleration/deceleration
pattern
Pr. 29
90
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.
Parameter
Number
Name
Initial
Value
Setting Range Description
7 Acceleration time
5s 0 to 3600s Motor acceleration time.
8 Deceleration time
5s 0 to 3600s Motor deceleration time.
20 ∗1
Acceleration/
deceleration
reference speed
3000r/min
30 to 12000r/min/
20 to 8000r/min
∗2∗3
Speed that will be the basis of acceleration/
deceleration time.
As acceleration/deceleration time, set the speed
change time from stop to Pr. 20.
44 ∗1
Second acceleration/
deceleration time
5s 0 to 3600s
Acceleration/deceleration time when the RT signal is
ON.
45 ∗1
Second deceleration
time
9999
0 to 3600s Deceleration time when the RT signal is ON.
9999 Acceleration time = deceleration time
791
Acceleration time in
low-speed range
9999
0 to 3600s
Acceleration time in the low-speed range (300r/min or
less)
9999 The acceleration time of Pr. 7
792
Deceleration time in
low-speed range
9999
0 to 3600s
Deceleration time in the low-speed range (300r/min or
less)
9999 The deceleration time of Pr. 8
∗1 The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 144)
∗2 Differs according to capacities. (0.2K to 2.2K/3.7K)
∗3 If a value exceeding 3000r/min is set, the actual rotation speed will be limited at 3000r/min.
(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 speed from 0r/min.
Set the acceleration time according to the following formula.
Acceleration
time setting
=
Pr. 20
×
Acceleration time from stop to
maximum operating speed
Maximum operating
speed
Example) How to find the setting value for Pr. 7 when increasing the rotation
speed to the maximum speed of 1500r/min in 10s with Pr. 20 = 3000r/
min (initial setting).
Pr. 7 =
3000r/min
× 10s = 20s
1500r/min
Running
speed
Acceleration time
Pr. 7, Pr. 44
Deceleration time
Pr. 8, Pr. 45
Time
Rotation
speed
Pr. 20
(3000r/min)
(r/min)
