170
Setting of acceleration/deceleration time
and acceleration/deceleration pattern
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
Name
Initial
Value
Setting
Range
Description
29
Acceleration/deceleration pattern
selection
0
0 Linear acceleration/ deceleration
1 S-pattern acceleration/deceleration A
2 S-pattern acceleration/deceleration B
3 Backlash measures
4 S-pattern acceleration/deceleration C
5 S-pattern acceleration/deceleration D
140 Backlash acceleration stopping frequency 1Hz 0 to 400Hz
Set the stopping frequency and time for
backlash measures.
Valid when Pr. 29 = 3
141 Backlash acceleration stopping time 0.5s 0 to 360s
142 Backlash deceleration stopping frequency 1Hz 0 to 400Hz
143 Backlash deceleration stopping time 0.5s 0 to 360s
380 Acceleration S-pattern 1 0 0 to 50%
Valid when S-pattern acceleration/
deceleration C (Pr. 29 = 4) is set.
Set the time taken for S-pattern from
starting of acceleration/deceleration to
linear acceleration as % to the
acceleration/deceleration time (Pr. 7, Pr. 8
etc.).
An acceleration/deceleration pattern can
be changed with the X20 signal.
381 Deceleration S-pattern 1 0 0 to 50%
382 Acceleration S-pattern 2 0 0 to 50%
383 Deceleration S-pattern 2 0 0 to 50%
516 S-pattern time at a start of acceleration 0.1s 0.1 to 2.5s
Valid when S-pattern acceleration/
deceleration D (Pr. 29 = 5) is set.
Set the time taken for S-pattern
acceleration/deceleration (S-pattern
operation).
517
S-pattern time at a completion of
acceleration
0.1s 0.1 to 2.5s
518 S-pattern time at a start of deceleraiton 0.1s 0.1 to 2.5s
519
S-pattern time at a completion of
deceleraiton
0.1s 0.1 to 2.5s
(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 = 50Hz) or higher.
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.
Setting value "0"
[Linear acceleration
/ deceleration]
Output frequency
(Hz)
Time
fb
Output frequency
(Hz)
Setting value "1"
Time
[S-pattern acceleration
/deceleration A]
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