Hitachi SJ700D-004L, Instruction Manual

Page: 102 / 288

Chapter 4 Explanation of Functions
4-31
4.2.25 Acceleration/deceleration curve selection
You can set different patterns of motor acceleration and deceleration
according to the type of system to be driven by the inverter.
Use functions "A097" and "A098" to select acceleration and
deceleration patterns, respectively.
You can individually set an acceleration pattern for acceleration and a deceleration pattern for deceleration.
When the acceleration/deceleration pattern is set other than 00 (linear) using analog input as frequency source is to
be avoided because it prolongs the acceleration or deceleration time.
Item Function code Data or range of data Description
Acceleration/deceleration
curve selection
A097/A098
00 Linear acceleration/deceleration
01 S-curve acceleration/deceleration
02 U-curve acceleration/deceleration
03 Inverted-U-curve acceleration/deceleration
04 EL-S-curve acceleration/deceleration
Acceleration/deceleration
curve constants setting
A131/ A132 1 to 10
1 (small degree of swelling)
10 (large degree of swelling)
Curvature for EL-S-curve
acceleration 1/2
A150/A151
0 to 50 (%)
Curvature of EL-S curve (for acceleration)
Curvature for EL-S-curve
deceleration 1/2
A152/A153
0 to 50 (%)
Curvature of EL-S curve (for deceleration)
(1) Acceleration/deceleration pattern selection
Select acceleration and deceleration patterns with reference to the following table:
Setting 00 01 02 03 04
Curve Linear S curve U curve Inverted-U curve EL-S curve
A097
(accele-r
ation
pattern)
A098
(decele-r
ation
pattern)
Descrip-
tion
With this pattern, the
motor is accelerated or
decelerated linearly until
its speed reaches the set
output frequency. This pattern is effective
for preventing the
collapse of cargo carried
by a lift or conveyor
driven by the inverter. This pattern is effective for the tension control on a
winding machine driven by the inverter (to prevent
cutting of the object to be wound). This pattern is similar
to the S-curve pattern
for the shockless
starting and stopping of
the motor, except that
the middle section of
this pattern is linear.
O
u
tp
u
t f
req
u
en
cy
Time
O
u
tp
u
t f
req
u
en
cy
Time
O
u
tp
u
t f
req
u
en
cy
Time
O
u
tp
u
t f
req
u
en
cy
Time
O
u
tp
u
t f
req
u
en
cy
Time
O
u
tp
u
t f
req
u
en
cy
Time
O
u
tp
u
t f
req
u
en
cy
Time
O
u
tp
u
t f
req
u
en
cy
Time
O
u
tp
u
t f
req
u
en
cy
Time
O
u
tp
u
t f
req
u
en
cy
Time
Related code
A097: Acceleration curve selection
A098: Deceleration curve setting
A131: Acceleration curve constants setting
A132: Deceleration curve constants setting
A150: Curvature for EL-S-curve acceleration 1
A151: Curvature for EL-S-curve acceleration 2
A152: Curvature for EL-S-curve deceleration 1
A153: Curvature for EL-S-curve deceleration 2