SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.

Chapter 4 Explanation of Functions
(2) Curve constant (swelling degree)
Specify the swelling degree of the acceleration curve with reference to the following graphs:
Output frequency (Hz) Output frequency (Hz) Output frequency (Hz)
Target
frequency
(100%)
Target
frequency
(100%)
Target
frequency
(100%)
96.9
82.4
17.6
3.1
10 02
02
10
25 50 75
Acceleration time (100%) to reach
the set output frequency
99.6
93.8
87.5 10
68.4
64.6 65
02
35
25 50 75
25 50 75
Time Time Time
The acceleration or deceleration time may be shortened midway through the acceleration or deceleration
according to the S-curve pattern.
If the LAD cancellation (LAC) function has been assigned to an intelligent input terminal and the LAC
terminal is turned on, the selected acceleration and deceleration patterns are ignored, and the output
frequency is quickly adjusted to that specified by the frequency command.
(3) Curvature of EL-S-curve pattern
When using the EL-S-curve pattern, you can set the curvatures (A150 to A153) individually for
acceleration and deceleration.
If all curvatures are set to 50%, the EL-S-curve pattern will be equivalent to the S-curve pattern.
Output frequency rate (%)
10
Acceleration time (100%) to reach
the set output frequency
35.4
31.6
12.5
6.25
0.39
02
10
Acceleration time (100%) to reach
the set output frequency
100
50
Curvature for
acceleration 2
(A151)
Curvature for
deceleration 1
(A152)
Curvature for
deceleration 2
(A153)
4.2.26 Energy-saver operation
Curvature for
acceleration 1 (A150)
Time (s)
Related code
A085: Operation mode selection
A086: Energy saving mode tuning
The energy-saver operation function allows you to automatically minimize
the inverter output power while the inverter is driving the motor at
constant speed. This function is suited to operating a fan, pump, or other
load that has a reduced-torque characteristic.
To use this function, specify "01" for the operation mode selection (A085).
Use the energy saving mode tuning function (A086) to adjust the response and accuracy of the
energy-saver operation.
The energy-saver operation function controls the inverter operation comparatively slowly. Therefore, if a
sudden change in the load occurs (e.g., impact load is applied), the motor may stall, and, consequently,
the inverter may trip because of overcurrent.
Item Function code Data Description
00 Normal operation
Operation mode selection
A085
01 Energy-saving operation
02 Fuzzy operation
Item Function code Data Response Accuracy
Energy saving mode tuning A086
0
Slow
High
100
Quick
Low
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