Mitsubishi Electric FR-E720-008 Instruction Manual page 109

Setting of acceleration/deceleration time and acceleration/ deceleration pattern
Parameter
Name
Number
Acceleration/
deceleration time
147∗1
switching
frequency
∗1
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 187)
∗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
(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.
(2) Deceleration time setting (Pr. 8, Pr. 20)
Use Pr. 8 Deceleration time to set the deceleration time required to reach 0Hz from Pr. 20 Acceleration/deceleration reference
frequency.
Set the deceleration time according to the following expression.
Deceleration
=
time setting Maximum operating frequency - Pr. 10
Example) How to find the setting value for Pr. 8 when decreasing the output
frequency from the maximum frequency of 50Hz in 10s with Pr. 20 =
120Hz and Pr. 10 = 3Hz.
(3) Change the setting range and increments of the acceleration/deceleration time (Pr. 21)
Use Pr. 21 to set the acceleration/deceleration time and minimum setting range.
Value "0" (initial value) ...........................0 to 3600s (minimum setting increments: 0.1s)
Value "1" .................................................0 to 360s (minimum setting increments: 0.01s)
NOTE
Changing the Pr. 21 setting changes the acceleration/deceleration time setting (Pr. 7, Pr. 8, Pr. 16, Pr. 44, Pr. 45).
(It does not influence the setting of Pr. 611 Acceleration time at a restart .)
<Example>
When Pr. 7 is set to "5.0s" at Pr. 21 setting of "0", and then Pr. 21 is changed to "1", the Pr. 7 setting automatically
changes to "0.5s".
Initial Value
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.
Acceleration
Time
time setting
Pr. 20
Setting
Range
Frequency when automatically switching to
0 to 400Hz the acceleration/deceleration time of Pr. 44
and Pr. 45.
9999 No function
Pr. 20
Acceleration time from a stop to the
×
=
Maximum operating
maximum operating frequency
frequency - Pr. 13
Pr. 7 =
×
Deceleration time from the maximum operating frequency to a stop
Pr. 8 =
Description
60Hz
× 10s
12.1s
50Hz - 0.5Hz
120Hz
× 10s
25.5s
50Hz-3Hz
109
4