Mitsubishi Electric FR-F800 Series Instruction Manual page 230

Pr.
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
Acceleration and
deceleration time
(Pr.7, Pr.8)
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
time
 Deceleration 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 decreasing the output frequency from
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
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Initial value
Name
FM CA
9999
JOG
(Pr.16)
Output frequency Pr.147
(or Pr.147= "9999" )
Output frequency Pr.147
Running
frequency
Time
Pr.7 Deceleration Pr.8
time
Pr.44 Pr.45
search engine
Setting range
Set the deceleration time in a low-speed range (less than 1/10 of the
0 to 3600 s
rated motor frequency).
The deceleration time set in Pr.8 is applied. (While the RT signal is
9999
ON, the second function is enabled.)
JOG-ON
RT-OFF
JOG-OFF
RT-ON
Output frequency 10% of the rated motor frequency
5.5 (F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
Description
Output frequency 10% of the rated motor frequency
1
2
3
4
Acceleration time
or
deceleration time
5
6
7
8
9
10
229
5. PARAMETERS