Acceleration/Deceleration Pattern (Pr. 29, Pr. 140 To Pr. 143, Pr. 380 To Pr. 383, Pr. 516 To Pr. 519); Pr. 516 To Pr. 519) - Mitsubishi Electric FR-A720-0.4K Instruction Manual

4.12.3 Acceleration/deceleration pattern (Pr. 29, Pr. 140 to Pr. 143, Pr. 380 to Pr. 383,

Pr. 516 to Pr. 519)

You can set the acceleration/deceleration pattern suitable for application.
You can also set the backlash measures that stop acceleration/deceleration once at the parameter-set frequency
and time during acceleration/deceleration.
Parameter
Number
Acceleration/deceleration pattern
29
selection
140 Backlash acceleration stopping frequency
141 Backlash acceleration stopping time
142 Backlash deceleration stopping frequency
143 Backlash deceleration stopping time
380 Acceleration S-pattern 1
381 Deceleration S-pattern 1
382 Acceleration S-pattern 2
383 Deceleration S-pattern 2
516 S-pattern time at a start of acceleration
S-pattern time at a completion of
517
acceleration
518 S-pattern time at a start of deceleraiton
S-pattern time at a completion of
519
deceleraiton
Setting value "0"
[Linear acceleration
/ deceleration]
Time
Setting value "1"
[S-pattern acceleration
/deceleration A]
fb
Time
CAUTION
⋅ As the acceleration/deceleration time of S-pattern acceleration/deceleration A, set the time taken until Pr. 3 Base frequency is
reached, not Pr. 20 Acceleration/deceleration reference frequency.
Initial
Name
Value
(1) Linear acceleration/ deceleration (Pr. 29 = "0", initial value)
⋅ When the frequency is changed for acceleration, deceleration, etc. in inverter
operation, the output frequency is changed linearly (linear acceleration/
deceleration) to reach the set frequency without straining the motor and inverter.
Linear acceleration/deceleration has a uniform frequency/time slope.
(2) S-pattern acceleration/deceleration A (Pr. 29 = "1")
⋅ For machine tool spindle applications, etc.
Used when acceleration/deceleration must be made in a short time to a high-
speed range of not lower than the base frequency. In this acceleration/
deceleration pattern, Pr. 3 Base frequency (fb) is the inflection point of the S
pattern and you can set the acceleration/deceleration time appropriate for motor
torque reduction in a constant-power operation region of Pr.3 Base frequency
(initial value = 60Hz) or higher.
Setting of acceleration/deceleration time
and acceleration/deceleration pattern
Setting
Range
0 Linear acceleration/ deceleration
1 S-pattern acceleration/deceleration A
2 S-pattern acceleration/deceleration B
0
3 Backlash measures
4 S-pattern acceleration/deceleration C
5 S-pattern acceleration/deceleration D
1Hz 0 to 400Hz
Set the stopping frequency and time for
0.5s 0 to 360s
backlash measures.
1Hz 0 to 400Hz
Valid when Pr. 29 = 3
0.5s 0 to 360s
0 0 to 50%
Valid when S-pattern acceleration/
deceleration C (Pr. 29 = 4) is set.
Set the time taken for S-pattern from
0 0 to 50%
starting of acceleration/deceleration to
linear acceleration as % to the
acceleration/deceleration time (Pr. 7, Pr. 8
0 0 to 50%
etc.).
An acceleration/deceleration pattern can
be changed with the X20 signal.
0 0 to 50%
0.1s 0.1 to 2.5s
Valid when S-pattern acceleration/
0.1s 0.1 to 2.5s
deceleration D (Pr. 29 = 5) is set.
Set the time taken for S-pattern
0.1s 0.1 to 2.5s
acceleration/deceleration (S-pattern
operation).
0.1s 0.1 to 2.5s
Description
171
Pr.28
page 165
Pr.30
page 197
Pr.139
page 349
Pr. 144
page 240
Pr.343
page 327
Pr.384
page 358
Pr.504
page 368
Pr. 547
page 340
4