Hitachi WJ C1 Series User Manual

Chapter 9 Inverter Functions
9-3-6
■ Setting the curvature for S-curve, U-curve, and reverse U-curve
 When S-curve, U-curve, or reverse U-curve pattern is selected in the [A097]/[A098], the
curvature can be set in [A131]/[A132].
 The figure below includes examples of curve constants for S-curve, U-curve, and reverse U-curve
for the values 02 and 10.
Example of S-curve acceleration
Example of U-curve acceleration
Example of reverse U-curve acceleration
■ Setting the curvature for EL-S-curve
 When using EL-S-curve, the curvature settings [A150] to [A153] can be used.
 If all curvature settings are set to 50 (%), the result will be equivalent to an S-curve.
 When you change the acceleration/deceleration pattern, the gradient of the
acceleration/deceleration time becomes steeper in some sections. If an overcurrent or
overvoltage occurs, it is necessary to adjust the acceleration/deceleration time.
 When the acceleration/deceleration pattern has any setting other than "Linear (00)", the
frequency command selection should not be an analog input command. If the command value
becomes unstable, the acceleration/deceleration pattern is recalculated, which may result in
the actual acceleration/deceleration time being extended.
 When the acceleration/deceleration pattern is set to a curve (not a linear), changing the
frequency command or acceleration/deceleration time during acceleration/deceleration, or
stopping the acceleration/deceleration using the "Acceleration/deceleration disable [HLD]"
input terminal results in the pattern being recalculated from that point in time. Please note that
this may result in excessive shock at the recalculation point, as shown in the example below.
Output frequency rate [%]
Time [s]
100
50
EL-S-curve ratio at start
of acceleration [A150]
EL-S-curve ratio at
end of acceleration
[A151]
EL-S-curve ratio at start
of deceleration [A152]
EL-S-curve ratio at end
of deceleration [A153]
Output frequency
If the acceleration/deceleration
time or frequency command is
changed, the pattern is
recalculated from that point in
time and the acceleration/
deceleration restarts according to
the new curve.
Before the
change
After the
change
0
Acceleration time
Before the
change
After the
change
!
Output frequency (%)
(Command value = 100%)
96.9
82.4
17.6
3.1
25
50
75
10
02
10
02
Acceleration time
(as a percentage of the set value)
100
100
0
65.0
35.4
0.4
25
50
75
10
02
31.6
12.5
6.3
Output frequency
(Command value = 100%)
100
0
100
Acceleration time
(as a percentage of the set value)
99.6
93.8
35.0
25
50
75
10
02
87.5
68.4
64.6
100
Output frequency
(Command value = 100%)
100
Acceleration time
(as a percentage of the set value)
0

Hitachi WJ C1 Series Specifications

General

Brand	Hitachi
Model	WJ C1 Series
Category	Inverter
Language	English