Hitachi SJ Series User Manual page 215

Chapter 12
Curve constant (degree of bulging) of pattern
• Determine the bulging degree by referring to the
following figure.
Output frequency (Hz)
Target
Frequency
(100%)
96.9
10
82.4
17.6
02
3.1 10
25 50
EL-S-shaped curve's curvature
• Use of an EL-S-shaped curve allows the curvature
settings [AC-08] to [AC-11] for
acceleration/deceleration.
Output frequency rate (%)
100
Curvature 2 for
acceleration
[AC-09]
50
Parameter
Item
Acceleration pattern selection
Deceleration pattern selection
Acceleration curve constant
Deceleration curve constant
Curvature 1 for EL-S-shaped
acceleration
Curvature 2 for EL-S-shaped
acceleration
Curvature 1 for EL-S-shaped
deceleration
Curvature 2 for EL-S-shaped
deceleration
Output frequency (Hz)
Target
Frequency
(100%)
99.6
02
93.8
87.5
68.4
64.6
35.0
75 Time
Acceleration time until the
set value for the frequency
is reached (100%)
Curvature 1 for acceleration
[AC-08]
Parameter
[AC-03]
[AC-04]
[AC-05]
[AC-06]
[AC-08]
[AC-09]
[AC-10]
[AC-11]
Output frequency (Hz)
Target
Frequency
(100%)
10
02
25 50 75 Time
Acceleration time until the
set value for the frequency
is reached (100%)
• Setting all the curvatures at 50 (%) makes the
EL-S-shaped curve equivalent to an S-shaped curve.
• When setting the pair of [AC-08] and [AC-09] or that of
[AC-10] and [AC-11], divide 100(%) into 2 segments, and
assign one of which to the former of the pair and the
other to the latter thereof (i.e., the two segments, if
summed up, render a value up to 100%).
• A setting where [AC-08] = 100 and [AC-09] = 0 makes the
acceleration curve a U-shaped acceleration curve.
Curvature 1 for
deceleration
[AC-10]
Curvature 2 for
deceleration
[AC-11]
Time (s)
Data
00
01
02
03
04
1~10
0~100(%)
0~100(%)
12-8-10
Inverter Function
65.0
02
35.4
31.6
10
12.5
6.25
0.39
25 50 75
Acceleration time until the
set value for the frequency
is reached (100%)
Description
Linear acceleration/deceleration
S-shaped
acceleration/deceleration
U-shaped
acceleration/deceleration
Inverse-U-shaped
acceleration/deceleration
EL-S-shaped
acceleration/deceleration
1 (small bulging)
10 (large bulging)
Designate the curvature of the
curved sector when an
EL-S-shaped pattern is used.
(For acceleration)
Designate the curvature of the
curved sector when an
EL-S-shaped pattern is used.
(For deceleration)
Time