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Operation selection functions 1 (Pr. 17 to Pr. 37)
<Setting>
Pr. 29
Setting
Function Description Operation
0
Linear
acceleration/
deceleration
(factory setting)
Acceleration/deceleration is made linearly up/down to
the preset speed .
1
S-pattern
acceleration/
deceleration A
(torque variation
technique)
The motor torque is utilized effectively to make fast
acceleration/deceleration in a large motor-generated
torque area and smooth acceleration/deceleration in a
small motor-generated torque area.
In this acceleration/deceleration pattern, the base
frequency is the inflection point of an S shape, and you
can set the acceleration/deceleration time according to
the reduction in motor torque in the constant-power
operation range at higher than the rated speed.
This function is valid for V/F control only. For other than
V/F control, linear acceleration/deceleration is made.
2
S-pattern
acceleration/
deceleration B
(shock absorption)
For prevention of load shifting in conveyor and other
applications
This setting always provides S-pattern acceleration/
deceleration from s2 (current speed) to s1 (preset
speed), easing an acceleration/deceleration shock and
producing an effect on the prevention of load shifting in
conveyor and other applications.
3
Backlash
measures
acceleration/
deceleration
Backlash measures for reduction gear, etc.
This function stops a 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 speed in accordance with the chart on the right.
The acceleration/deceleration time is increased by the
stopping time.
4
S-pattern
acceleration/
deceleration C
See next page. See next page.
REMARKS
For the acceleration/deceleration time, turning on the RT signal makes Pr. 44 "second acceleration/deceleration time" and Pr.
45 "second deceleration time" valid (turning on the X9 signal makes Pr. 110 and Pr. 111 valid). Refer to page 78.
Output
speed
(r/min)
Time
[Linear acceleration
/deceleration]
CAUTION
As the acceleration/deceleration time, set the
time taken to reach Pr. 3 "base frequency", not Pr.
20 "acceleration/deceleration reference speed".
[S-pattern acceleration
/deceleration A]
Output
speed
(r/min)
Time
Base frequency
s1
[S-pattern acceleration
/deceleration B]
s2
Output
speed
(r/min)
Time
REMARKS
Output speed is retained for the time for the starting
speed (Pr. 13) and s1 (Pr. 140) time at a start and
accelerate again after t1 time has elapsed. Speed
reaches or below s2 (Pr. 142) is retained for t2
(Pr. 143) time at a start of deceleration and
decelerate again after t2 time has elapsed.
[Backlash measures function]
s2
Pr.142
t2
t1
s1
Pr.140
Output
speed
(r/min)
Pr.141
Time
Pr.143