Mitsubishi Electric FR-A800, Instruction Manual

Page: 415 / 1042

Parameters (F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
FR-A800 5 - 235
Control block diagram
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.
쑶
I002830E
Fig. 5-84: Control block diagram
Acceleration time setting
=
Pr. 20
×
Acceleration time from stop status to maximum frequency
(Maximum frequency – Pr. 13)
Example
쑴
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
Fig. 5-85:
Acceleration/deceleration time
I002553E
(Pr. 16 )
Acceleration and
deceleration time
(Pr. 7, Pr. 8)
Second acceleration and
deceleration time
(Pr. 44, Pr. 45)
Third acceleration and
deceleration time
(Pr. 110, Pr. 111)
Output frequency < Pr. 147
(or Pr. 147 = “9999” )
Output frequency Pr. 147
RT = ON
RT = OFF
X9 = ON
X9 = OFF
Acceleration time
or
deceleration time
JOG = OFF
JOG = ON
Output frequency > 10% of the rated motor frequency
Output frequency
≤
10% of the rated motor frequency
Acceleration and deceleration
time in low-speed range
(Pr. 791, Pr. 792)
Output frequency Pr. 147
Output fr
e
q
uenc
y (
H
z)
Running
frequency
Time
Pr. 8
Pr. 45
Pr. 111 Pr. 7
Pr. 44
Pr. 110
Deceleration
time
Acceleration
time
Pr. 20
(60 Hz/50 Hz)