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Setting of acceleration/deceleration time
and acceleration/deceleration pattern
4
PARAMETERS
4.8.4 Acceleration/deceleration pattern (Pr.29, Pr.140 to Pr.143)
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 201)
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
6 Variable-torque acceleration/deceleration
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
(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 range of base frequency (fb) or
higher.
* Rated motor frequency under IPM motor control (refer to page 81).
CAUTION
⋅ For the acceleration/deceleration time of the S-pattern acceleration/deceleration A, set the time to reach Pr.3 Base frequency
(rated IPM motor frequency under IPM motor control (refer to page 81)) but not the time to reach 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]