Setting Of Acceleration/Deceleration Time And Acceleration/ Deceleration Pattern; Setting Of The Acceleration And Deceleration Time (Pr. 7, Pr. 8, Pr. 20, Pr. 44, Pr. 45, Pr. 791, Pr. 792) - Mitsubishi Electric FR-F700PJ Instruction Manual

Setting of acceleration/deceleration time and acceleration/ deceleration pattern

4.8 Setting of acceleration/deceleration time and acceleration/
deceleration pattern
Purpose
Motor acceleration/deceleration time
setting
Starting frequency
Minimum motor speed frequency
Set acceleration/deceleration pattern
suitable for application
4.8.1 Setting of the acceleration and deceleration time
(Pr. 7, Pr. 8, Pr. 20, Pr. 44, Pr. 45, Pr. 791, Pr. 792)
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 161).
Parameter
Name
Number
7 Acceleration time
8 Deceleration time
Acceleration/
20 deceleration
reference frequency
Second acceleration/
44
deceleration time
Second deceleration
45
time
791
Acceleration time in
low-speed range
IPM IPM IPM
792
Deceleration time in
low-speed range
IPM IPM IPM

The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 197)

Performing IPM parameter initialization changes the settings. (Refer to page 85)
Pr. 20
(60Hz)
Acceleration time
Deceleration time
Pr. 7, Pr. 44
Pr. 8, Pr. 45
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.
Acceleration/deceleration
times
Starting frequency and start-
time hold
Starting frequency
Acceleration/deceleration
pattern
Initial Value
7.5K or lower
11K or higher
7.5K or lower
11K or higher

60Hz
7.5K or lower
11K or higher
9999
9999
9999
(1) Acceleration time setting (Pr. 7, Pr. 20)
Use Pr. 7 Acceleration time to set the acceleration time required to reach Pr. 20

Running
Acceleration/deceleration reference frequency from 0Hz.
frequency
Set the acceleration time according to the following formula.

Time
Acceleration
time setting
* The output starts at 0Hz under IPM motor control. Calculate with 0Hz.
Parameter that should be Set
Pr. 7, Pr. 8, Pr. 20, Pr. 44, Pr. 45,
Pr. 791, Pr. 792
Pr. 13, Pr. 571
Setting
Range
5s
0 to 3600s Motor acceleration time.
15s
10s
0 to 3600s Motor deceleration time.
30s
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.
5s
Acceleration/deceleration time when the RT
0 to 3600s
15s signal is ON.
0 to 3600s Deceleration time when the RT signal is ON.
9999 Acceleration time = deceleration time
Acceleration time in the low-speed range
0 to 3600s (slower than 10% of the rated motor
frequency) is set.
The acceleration time set in Pr.7 is applied.
9999 (When the second function is enabled, the
setting is applied.)
Deceleration time in the low-speed range
0 to 3600s (slower than 10% of the rated motor
frequency) is set.
The deceleration time set in Pr.8 is applied.
9999 (When the second function is enabled, the
setting is applied.)
Acceleration time from stop to maximum
Pr. 20

=
Maximum operating operating frequency
frequency - Pr. 13
Pr. 7 =
Refer to Page
113
116
Pr. 13
117
Pr. 29
118
Description
60Hz
 10s
50Hz - 0.5Hz
4
12.1s
113