Mitsubishi Electric FR-A700 Instruction Manual page 376

Acceleration and deceleration
Acceleration time setting (Pr. 7, Pr. 20)
Use Pr. 7, 44 and 110 to set the acceleration time required to reach Pr. 20 "Acceleration/
deceleration reference frequency" from 0Hz. The setting value of Pr. 13 "Starting frequency"
must be considered.
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
The acceleration can be made up to the maximum operating 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". When the DC injection brake is activated, the
setting value of Pr. 10 must be considered
Set the deceleration time according to the following formula:
Deceleration
time setting
Example When Pr. 20 = 120Hz, Pr. 10 = 3Hz
The deceleration can be made up from the maximum operating frequency of 40Hz to a stop
in 10s.
Pr. 8
6 - 196
Hz
0
Pr.7
Pr.44
Pr.110
Pr. 20
= ------------------------------------------------------------------------------------------------------
Maximum operating frequency Pr. 13
50Hz
×
---------------------------------- -
= 10s
40Hz 0,5Hz
–
Pr. 20
------------------------------------------------------------------------------------------------------
=
Maximum operating frequency Pr. 10
120Hz
×
------------------------------ -
= 10s
40Hz 3Hz
–
Fig. 6-77:
Acceleration/deceleration time
t
Pr.8
Pr.45
Pr.111
Acceleration time from stop to
×
maximum operating frequency
–
=
12.7s
Deceleration time from maximum
×
operating frequency to stop
–
=
32.4s
Parameter
I000006E