Mitsubishi Electronics FR-A500 ユーザーズマニュアル
86
4.2.14 Acceleration/deceleration pattern (Pr. 29, Pr. 140 to Pr. 143)
Pr. 29 "acceleration/deceleration pattern"
Pr. 140 "backlash acceleration stopping frequency"
Pr. 141 "backlash acceleration stopping time"
Pr. 142 "backlash deceleration stopping frequency"
Pr. 143 "backlash deceleration stopping time"
Set the acceleration/deceleration pattern.
Also, you can suspend acceleration/deceleration at set frequencies and for the time period set in the
parameters.
<Setting>
Parameter
Number
Factory
Setting
Setting Range
Remarks
29
0
0, 1, 2, 3
3: Backlash compensation
140
1.00Hz
0 to 400Hz
Valid when Pr. 29 = 3.
141
0.5 s
0 to 360 s
Valid when Pr. 29 = 3.
142
1.00Hz
0 to 400Hz
Valid when Pr. 29 = 3.
143
0.5 s
0 to 360 s
Valid when Pr. 29 = 3.
Pr. 29
Setting
Function
Description
0
Linear
acceleration/
deceleration
acceleration/
deceleration
Linear acceleration/deceleration is made up/down to the preset frequency (factory setting).
1
S-shaped
acceleration/
deceleration A
(Note 1)
acceleration/
deceleration A
(Note 1)
For machine tool spindles
This setting is used when it is necessary to make acceleration/deceleration in a short time up to the
60Hz or higher speed range. In this acceleration/deceleration pattern, fb (base frequency) is always the
inflection point of an S shape, and you can set the acceleration/deceleration time according to the
reduction in motor torque in the 60Hz or higher constant-output operation range.
This setting is used when it is necessary to make acceleration/deceleration in a short time up to the
60Hz or higher speed range. In this acceleration/deceleration pattern, fb (base frequency) is always the
inflection point of an S shape, and you can set the acceleration/deceleration time according to the
reduction in motor torque in the 60Hz or higher constant-output operation range.
2
S-shaped
acceleration/
deceleration B
acceleration/
deceleration B
Prevention of cargo collapse on conveyor, etc.
This setting provides S-shaped acceleration/deceleration from f2 (current frequency) to f1 (target
frequency), easing an acceleration/deceleration shock. This pattern has an effect on the prevention of
cargo collapse, etc.
This setting provides S-shaped acceleration/deceleration from f2 (current frequency) to f1 (target
frequency), easing an acceleration/deceleration shock. This pattern has an effect on the prevention of
cargo collapse, etc.
3
Backlash
compensation
(Note 2, 3)
compensation
(Note 2, 3)
Backlash compensation for reduction gear, etc.
This function stops the speed change temporarily during acceleration/deceleration, reducing a shock
generated when a reduction gear backlash is eliminated suddenly. Use Pr. 140 to Pr. 143 to set the
stopping times and stopping frequencies in accordance with the above diagrams.
This function stops the speed change temporarily during acceleration/deceleration, reducing a shock
generated when a reduction gear backlash is eliminated suddenly. Use Pr. 140 to Pr. 143 to set the
stopping times and stopping frequencies in accordance with the above diagrams.
Note: 1. For the acceleration/deceleration time, set the time required to reach the "base frequency" in Pr. 3,
not the "acceleration/deceleration reference frequency" in Pr. 20. For details, refer to Pr. 7 and Pr. 8.
2. Pr. 140 to Pr. 143 is accessible when "3" is set in Pr. 29.
3. The acceleration/deceleration time is increased by the stopping time.
3. The acceleration/deceleration time is increased by the stopping time.
Related parameters
Pr. 3 "base frequency"
Pr. 7 "acceleration time"
Pr. 8 "deceleration time"
Pr. 20 "acceleration/deceleration
Pr. 7 "acceleration time"
Pr. 8 "deceleration time"
Pr. 20 "acceleration/deceleration
reference frequency"
Pr. 44 "second acceleration/
deceleration time"
Pr. 45 "second deceleration time"
Pr. 110 "third acceleration/
Pr. 110 "third acceleration/
deceleration time"
Pr. 111 "third deceleration time"
Time
[Linear acceleration/deceleration]
O
u
tp
u
t f
req
ue
nc
y (H
z
)
Set value 0
fb
[S-shaped acceleration/deceleration A]
Time
Ou
tpu
t f
re
quen
cy
(H
z)
Set value 1
f1
f2
[S-shaped acceleration/deceleration B]
O
u
tp
u
t f
req
ue
nc
y (H
z
)
Time
Set value 2
Pr.142
Pr.143
Pr.141
Ou
tpu
t f
re
quen
cy
(H
z)
Set value 3
[Backlash compensation function]
Time
t2
t1
Pr.140
f1
f2