Energy-Saver Operation (A085, A086) - Hitachi SJ700-2 Instruction Manual

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)
Ta rget
frequenc y
(100%)
96.9
10
82.4
17.6
02
3.1
10
25 50
Acceleration time (100%) to reach
the set output frequency
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 (%)
100
Curvature for
acceleration 2
(A151)
50
4.2.26 Energy-saver operation
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
Operation mode selection
Item
Energy saving mode tuning
Output frequency (Hz)
Target
frequency
(100%)
99.6
02
93.8
87.5
68.4
64.6
35
75
Time
Acceleration time (100%) to reach
the set output frequency
Curvature for
acceleration 1 (A150)
Function code
A085
Function code
A086
Output frequency (Hz)
Target
frequency
(100%)
10
02
10
25 50 75
Time
Curvature for
deceleration 1
(A152)
Curvature for
deceleration 2
(A153)
Time (s)
Data
00 Normal operation
01 Energy-saving operation
02 Fuzzy operation
Data
0
100
4 - 32
65
02
35.4
31.6
10
12.5
6.25
0.39
25 50 75
Acceleration time (100%) to reach
the set output frequency
Related code
A085: Operation mode selection
A086: Energy saving mode tuning
Description
Response Accuracy
Slow High
Quick
Time
Low