Mitsubishi Electric FR-A820-00046 Instruction Manual page 445

Parameters
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 stop status.
● Set the acceleration time according to the following formula.
Acceleration time setting
Example For example, the following calculation is performed to find the setting value for Pr. 7 when increas-
ing the output frequency to the maximum frequency of 50 Hz in 10 s with Pr. 20 = "60 Hz (initial
value)" and Pr. 13 = "0.5 Hz".
Pr. 7 = 60 Hz × 10 s / (50 Hz - 0.5 Hz)
≈ 12.1 s
(60 Hz/50 Hz)
Acceleration
time
FR-A800
(F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
Pr. 20
=
Pr. 20
Running
frequency
Pr. 7 Deceleration
time
Pr. 44
Pr. 110
Acceleration time from stop status to maximum frequency
×
(Maximum frequency – Pr. 13)
Fig. 5-86:
Acceleration/deceleration time
Time
Pr. 8
Pr. 45
Pr. 111
I002553E
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