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Mitsubishi Electric FR-F740-00023 Instruction Manual: Setting Of Acceleration/deceleration Time And Acceleration/deceleration Pattern; Setting Of The Acceleration And Deceleration Time (pr.7, Pr.8, Pr.20, Pr.21, Pr.44, Pr)

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Setting of acceleration/deceleration time
and acceleration/deceleration pattern
4.7 Setting of acceleration/deceleration time and
acceleration/deceleration pattern
Purpose
Motor acceleration/deceleration time
setting
Starting frequency
Set acceleration/deceleration pattern
suitable for application
4.7.1
Setting of the acceleration and deceleration time (Pr.7, Pr.8, Pr.20, Pr.21, Pr.44, Pr.45)
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
Name
Number
7
Acceleration time
8
Deceleration time
Acceleration/
deceleration
20
*1
reference frequency
Acceleration/
deceleration time
21
*1
increments
Second
acceleration/
44
*1
deceleration time
Second
45
*1
deceleration time
*1
The parameters can be set when Pr. 160 User group read selection = "0" (Refer to page 173)
*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".
Pr.20
(50Hz)
Acceleration
Pr.7
Deceleration
time
time
Example) How to find the setting value for Pr.7 when increasing the output
frequency to the maximum frequency of 40Hz in 10s with Pr.20 =
50Hz (initial setting) and Pr.13 = 0.5Hz.
90
Acceleration/deceleration times
Starting frequency and start-
time hold
Acceleration/deceleration
pattern and backlash measures
Initial Value
00170 or less
00250 or more
00170 or less
00250 or more
50Hz
0
5s
9999
(1) Acceleration time setting (Pr.7, Pr.20)
Use Pr. 7 Acceleration time to set the acceleration time required to reach Pr.
Running
20 Acceleration/deceleration reference frequency from 0Hz.
frequency
Set the acceleration time according to the following formula.
Acceleration
Time
time setting
Pr.8
Parameter that must be set
Pr.7, Pr.8, Pr.20, Pr.21,
Pr.29, Pr.140 to Pr.143
Setting Range
5s
0 to 3600/ 360s
Set the motor acceleration time.
*2
15s
10s
0 to 3600/ 360s
Set the motor deceleration time.
*2
30s
Set the frequency that will be the basis of
acceleration/deceleration time.
1 to 400Hz
As acceleration/deceleration time, set the
frequency change time from stop to Pr. 20.
Increments: 0.1s
0
Range: 0 to 3600s
Increments: 0.01s
1
Range: 0 to 360s
Set the acceleration/deceleration time
0 to 3600/360s
*2
when the RT signal is on.
Set the deceleration time when the RT
0 to 3600/360s
*2
signal is on.
9999
Acceleration time = deceleration time
Pr.20
=
Maximum operating
frequency - Pr. 13
Pr.7 =
Refer to page
Pr.44, Pr.45
Pr.13, Pr.571
Description
Increments and
setting range of
acceleration/
deceleration time
setting can be
changed.
Acceleration time from stop to
maximum operating frequency
50Hz
10s
40Hz - 0.5Hz
90
92
93
12.7s

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