Control Block Diagram - Mitsubishi Electric FR-F820-00046 Instruction Manual

Pr. Name
Deceleration time
792
in low-speed
F071
range
*1 For the FR-F820-00340(7.5K) or lower, and FR-F840-00170(7.5K) or lower.
*2 For the FR-F820-00490(11K) or higher, and FR-F840-00250(11K) or higher.
 Control block diagram
JOG
(Pr.16)
Output frequency Pr.147
(or Pr.147= "9999" )
Acceleration and
deceleration time
(Pr.7, Pr.8)
Output frequency Pr.147
Second acceleration and
deceleration time
(Pr.44, Pr.45)
Acceleration and
deceleration time
in low-speed range
(Pr.791, Pr.792)
 Acceleration time setting (Pr.7, Pr.20)
• Use Pr.7 Acceleration time to set the acceleration time required to change the frequency to the frequency set in Pr.20
Acceleration/deceleration reference frequency from stop status.
• Set the acceleration time according to the following formula.
Acceleration time setting = Pr.20 setting × (Acceleration time to change the frequency from stop status to maximum
frequency) / (Maximum frequency - Pr.13 setting)
• For example, the following calculation is performed to find the setting value for Pr.7 when increasing the output frequency
to the maximum frequency of 50 Hz in 10 seconds with Pr.20 = 60 Hz (initial value) and Pr.13 = 0.5 Hz.
Pr.7 setting = 60 Hz × 10 s / (50 Hz - 0.5 Hz) ≈ 12.1 s
Pr.20
(60Hz/50Hz)
Acceleration Pr.7 Deceleration
time Pr.44 time
 Acceleration time setting (Pr.8, Pr.20)
• Use Pr.8 Deceleration time to set the deceleration time required to change the frequency to a stop status from the
frequency set in Pr.20 Acceleration/deceleration reference frequency.
• Set the deceleration time according to the following formula.
Deceleration time setting = Pr.20 setting × (Deceleration time to change the frequency from maximum frequency to stop
status) / (Maximum frequency - Pr.10 setting)
• For example, the following calculation is used to find the setting value for Pr.8 when increasing the output frequency to the
maximum frequency of 50 Hz in 10 seconds with Pr.20 = 120 Hz and Pr.10 = 3 Hz.
Pr.8 setting = 120 Hz × 10 s / (50 Hz - 3 Hz) ≈ 25.5 s
Initial value
Setting range
FM CA
0 to 3600 s
9999
9999
RT-OFF
RT-ON
Running
frequency
Time
Pr.8
Pr.45
5.5 (F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
Description
Set the deceleration time in a low-speed range (less than 1/10 of the
rated motor frequency).
The deceleration time set in Pr.8 is applied. (While the RT signal is
ON, the second function is enabled.)
Output frequency 10% of the rated motor frequency
JOG-ON
JOG-OFF
Output frequency 10% of the rated motor frequency
1
2
3
Acceleration time
4
or
deceleration time
5
6
7
8
9
10
217
5. PARAMETERS