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 |