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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
96
Starting frequency
Starting frequency and
start-time hold
Pr. 13, Pr. 571
98
Set acceleration/deceleration
pattern suitable for application
Acceleration/deceleration
pattern
Pr. 29
99
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 136).
Parameter
Number
Name Initial Value
Setting
Range
Description
7 Acceleration time
FR-D720-165 or less
FR-D740-080 or less
FR-D720S-008 to 100
5s
0 to 3600s Motor acceleration time.
FR-D720-238 or more
FR-D740-120 or more
10s
8 Deceleration time
FR-D720-165 or less
FR-D740-080 or less
FR-D720S-008 to 100
5s
0 to 3600s Motor deceleration time.
FR-D720-238 or more
FR-D740-120 or more
10s
20 ∗1
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 ∗1
Second acceleration/
deceleration time
FR-D720-165 or less
FR-D740-080 or less
FR-D720S-008 to 100
5s
0 to 3600s
Acceleration/deceleration time when the RT
signal is on.
FR-D720-238 or more
FR-D740-120 or more
10s
45 ∗1
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". (Refer to page 162)
(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)When Pr. 20 = 60Hz (initial value), Pr. 13 = 0.5Hz, and acceleration can be
made up to the maximum operating frequency of 50Hz in 10s
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