Mitsubishi Electric FR-D720S SC EC Instruction Manual page 210

Acceleration and deceleration
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.
Pr. 20
Set the acceleration time according to the following formula:
Acceleration
time setting
Example When Pr. 20 = 50Hz (initial value), Pr. 13 = 0.5Hz
How to find the setting value for Pr. 7 when increasing the output frequency to the maximum
frequency of 40Hz in 10s.
Pr. 7
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 formula:
Deceleration
time setting
Example When Pr. 20 = 120Hz, Pr. 10 = 3Hz
How to find the setting value for Pr.8 when decreasing the output frequency from the maxi-
mum frequency of 40Hz in 10s.
Pr. 8
6 - 60
Hz
0
Pr. 7
Pr. 44
Pr. 20
------------------------------------------------------------------------------------------------------
=
Maximum operating frequency Pr. 13
50Hz
×
---------------------------------- -
= 10s
–
40Hz 0,5Hz
Pr. 20
----------------------------------------------------------------------------------------------------- -
=
Maximum operating frequency Pr. 10
120Hz
×
------------------------------ -
= 10s
–
40Hz 3Hz
Fig. 6-27:
Acceleration/deceleration time
t
Pr. 8
Pr. 45
Acceleration time from stop to
×
–
maximum operating frequency
12.7s
Deceleration time from maximum
×
–
operating frequency to stop
32.4s
Parameter
I000006C