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Acceleration/deceleration Pattern (pr. 29, Pr. 140 To Pr. 143) - Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual

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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.
Parameter
Factory Setting
Number
29
0
140
1.00Hz
141
0.5 s
142
1.00Hz
143
0 s
Set value 0
[Linear acceleration/deceleration]
[S-shaped acceleration/deceleration A]
fb
t
Time
<Setting>
Pr. 29
Function
Setting
Linear
0
acceleration/
Linear acceleration/deceleration is made up/down to the preset frequency (factory setting).
deceleration
For machine tool spindles
S-shaped
This setting is used when it is necessary to make acceleration/deceleration in a short time up to the
acceleration/
1
60Hz or higher speed range. In this acceleration/deceleration pattern, fb (base frequency) is always the
deceleration A
inflection point of an S shape, and you can set the acceleration/deceleration time according to the
(Note 1)
reduction in motor torque in the 60Hz or higher constant-output operation range.
Prevention of cargo collapse on conveyor, etc.
S-shaped
This setting provides S-shaped acceleration/deceleration from f2 (current frequency) to f1 (target
2
acceleration/
frequency), easing an acceleration/deceleration shock. This pattern has an effect on the prevention of
deceleration B
cargo collapse, etc.
Backlash compensation for reduction gear, etc.
Backlash
This function stops the speed change temporarily during acceleration/deceleration, reducing a shock
3
compensation
generated when a reduction gear backlash is eliminated suddenly. Use Pr. 140 to Pr. 143 to set the
(Note 2, 3)
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.
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Setting Range
Remarks
0, 1, 2, 3
3: Backlash compensation
0 to 400Hz
Valid when Pr. 29 = 3.
0 to 360 s
Valid when Pr. 29 = 3.
0 to 400Hz
Valid when Pr. 29 = 3.
0 to 360 s
Valid when Pr. 29 = 3.
Set value 1
Set value 2
[S-shaped acceleration/deceleration B]
f1
f2
t
Time
Description
75
PARAMETERS
Related parameters
Pr. 3 "base frequency"
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/
deceleration time"
Pr. 111 "third deceleration time"
Set value 3
[Backlash compensation function]
∆f2 Pr.142
∆f1
Pr.140
t
Time
∆t1 Pr.141
∆t2 Pr.143
t
Time

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