Mitsubishi Electric FR-E800 Instruction Manual page 264

Pr. Name
791 Acceleration time in low-speed
F070 range
792 Deceleration time in low-speed
F071 range
375 Faulty acceleration rate
H801 detection level
*1 Gr.1 and Gr.2 are the parameter initial value groups. (Refer to
*2 Initial value for the FR-E820-0175(3.7K) or lower, FR-E840-0095(3.7K) or lower, FR-E860-0061(3.7K) or lower, FR-E820S-0110(2.2K) or lower,
FR-E810W-0050(0.75K) or lower, and FR-E846-0095(3.7K) or lower.
*3 Initial value for the FR-E820-0240(5.5K), FR-E820-0330(7.5K), FR-E840-0120(5.5K), FR-E840-0170(7.5K), and FR-E860-0090(5.5K) or higher.
*4 Initial value for the FR-E820-0470(11K) or higher and FR-E840-0230(11K) or higher.
 Control block diagram
JOG
(Pr.16)
Output frequency Pr.147
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 × Acceleration time from stop status to maximum frequency / (Maximum frequency - Pr.13)
• 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
 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 × deceleration time from maximum frequency to stop / (maximum frequency - Pr.10)
*1
Initial value
Setting range
Gr.1 Gr.2
0 to 3600 s
9999
9999
0 to 3600 s
9999
9999
9999 0 to 400 Hz/ms
(or Pr.147= "9999" )
RT-OFF
RT-ON
Set
frequency
Time
Pr.8
Pr.45
Set the acceleration time in a low-speed range.
The acceleration time set in Pr.7 is applied. (While the RT
signal is ON, the second function is enabled.)
Set the deceleration time in a low-speed range.
The deceleration time set in Pr.8 is applied. (While the RT
signal is ON, the second function is enabled.)
If the motor rotation speed exceeds the speed set in Pr.375,
E.OA (Acceleration error) is activated, and the inverter
output is shut off.
page 54.)
Output frequency 10% of the rated motor frequency
JOG-ON
JOG-OFF
Output frequency 10% of the rated motor frequency
9. (F) Settings for Acceleration/Deceleration
9.1 Setting the acceleration and deceleration time
Description
Acceleration time
or
deceleration time
1
2
3
4
5
6
7
8
9
10
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