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Technologies
HI-SAVER (power saver)
Energy-saving /
Control System
Technical Features
and Effects
Comparative Analysis
of Power Savers
Anticipated Benefits
F/Proof HMI Features

Anticipated Benefits

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Effects of introducing HI-SAVER

Before installation After installation
Damage to equipment and adverse impacts on system power sources occur because of the generation of the starting current that is 6–7 times higher than the rated current. Improvement in the equipment’s lifetime and product’s quality because of soft starting.
Degradation of productivity due to lack of precise controlling of hydraulic pressure and air flow rate
(The biggest issue)
Complete reproducibility through precision control of
hydraulic and air flow rate by using KSCS
(vector control)
Power disturbance causes direct damage to nearby
equipment and generates harmonics.
Prevents damage to motors and nearby equipment from power disturbance. Minimizes harmonics (power quality control unit embedded)
Inefficient load control causes not only LCC but also
production costs, power costs, and maintenance costs to increase.
Optimal load control allows LCC to be managed effectively. Reduces the power costs, maintenance costs, and facility capacity and improves productivity
Increases the fatigue to the motor due to intermittent and rapid acceleration and deceleration in controlling the speed. Speed can be adjusted easily because of the stepless control Relieves the fatigue to the motor and saves energy.

HI-SAVER compared with other companies' products

Classification HI-SAVER High efficiency
inverter < VVVF >
VVCF
Applied capacity 220kW (220V 380V 440V 3300V 6600V) 220kW (220V 380V 440V) 220kW (220V 380V 440V)
Object to be controlled Controls the current for the field system and for the torque by controlling the size and direction of voltage Identical rate control of Variable Voltage Variable Frequency control Variable Voltage Constant Frequency control
Control method Vector control + Developed product KSCS Inverter control Control of the voltage and current phases (Slip control)
Controlled frequency 6~60HZ+50HZ (Precision control load) Limitation exists (Precision control load X
Acceleration and deceleration features Easy to inhibit overcurrent. No limitation for rapid acceleration and deceleration. Able to constant four quadrant drives Dead timer exists. Limitation exists for rapid acceleration and deceleration. Low capacity to inhibit overcurrent. Soft Start Soft Stop (Start, Stop)
Hydraulic and wind pressure when saving Proportional to the RPM squared. Hydraulic and air pressure precision control Proportional to the RPM squared Proportional to the voltage squared
Power conservation Proportional to the RPM squared. Hydraulic and air pressure precision control Proportional to the RPM cubed Proportional to RPM (Copper loss = Iron loss maintained at a certain level) Proportional to RPM (Copper loss = Iron loss maintained at a certain level)
Applied load Squared torque load precision control Squared torque load No load. Load that is started frequently
Precautions in application Product quality enhancement due to hydraulic and air pressure precision control Lowering of the hydraulic and air pressures. Lack of precision control. Stalling occurs at low speeds. Reviewing of the starting torque considering the torque reduction (Torque proportional to the voltage squqred)
Control range 1:100 or higher 1:10 X
Relationship between speed and loss Simultaneous control of the frequency and voltage (v/f) Loss at a constant level Simultaneous control of the frequency and voltage (v/f) Loss at a constant level Loss increases when the speed decreases because of the slip control
Harmonics Occurrence is minimized Preventative measures are needed. Preventative measures are needed.
Torque control Possible Impossible Impossible
Speed detection Speed and position detection Not to be done Not to be done