Mitsubishi Electric FR-F820-00077 Instruction Manual page 275

Parameters
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
FR-F800
(F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
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
Acceleration time
or
deceleration time
I003016E
I002553E
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