Mitsubishi Electric FR-A820-00046 Instruction Manual page 415

Parameters
Control block diagram
Second acceleration and
Third acceleration and
Acceleration and deceleration
time in low-speed range
Fig. 5-84:
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. 16 )
Output frequency < Pr. 147
(or Pr. 147 = "9999" )
Acceleration and
deceleration time
(Pr. 7, Pr. 8)
Output frequency
deceleration time
(Pr. 44, Pr. 45)
deceleration time
Output frequency Pr. 147
(Pr. 110, Pr. 111)
(Pr. 791, Pr. 792)
Control block diagram
=
Pr. 20
Running
frequency
Deceleration
Pr. 7
time
Pr. 44
Pr. 110
JOG = ON
RT = OFF X9 = OFF
JOG = OFF
Pr. 147
RT = ON
X9 = ON
Pr. 20 Acceleration time from stop status to maximum frequency
×
(Maximum frequency – Pr. 13)
Fig. 5-85:
Acceleration/deceleration time
Time
Pr. 8
Pr. 45
Pr. 111
Output frequency > 10% of the rated motor frequency
Output frequency ≤ 10% of the rated motor frequency
Acceleration time
or
deceleration time
I002830E
I002553E
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