Mitsubishi Electric FR-F820-04750 Instruction Manual page 262

(F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
Control block diagram
Acceleration and
deceleration time
(Pr. 7, Pr. 8)
acceleration and
deceleration time
(Pr. 44, Pr. 45)
Acceleration and
deceleration time in
low-speed range
(Pr. 791, Pr. 792)
Fig. 5-16:
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
5 - 100
JOG
(Pr. 16 )
Output frequency < Pr. 147
(or Pr. 147 = "9999" )
Second
Output frequency Pr. 147
Control block diagram
Pr. 20
=
Pr. 20
Running
frequency
Pr. 7 Deceleration
time
Pr. 44
JOG = ON
RT = OFF
JOG = OFF
RT = ON
Acceleration time from stop status to maximum frequency
×
(Maximum frequency – Pr. 13)
Fig. 5-17:
Acceleration/deceleration time
Time
Pr. 8
Pr. 45
Output frequency > 10% of the rated motor frequency
Output frequency ≤ 10% of the rated motor frequency
Parameters
Acceleration time
or
deceleration time
I003016E
I002553E