1. Overview Energy Saving VFDs Reference 1] Overview

2. Using VFD For Energy Saving Advance Possibilities With VFDs Overview Energy Saving VFDs Reference

3. 2] Variable Frequency Drive Energy Saving Principle by Drive Drive Drive is a control equipment that controls motor speed efficiently as changing voltage and frequency of commercial power. Input 230/400 50HZ Output Changed voltage/frequency Control amount of FAN’s wind as controlling motor speed U V W R/L1 S/L2 T/L3 Speed of Induction Motor N: IM Speed (rev/min) f: Frequency (Hz) P: Quantity of Poles S: Slip Ns: Synchronous Speed The important factors for controlling speed are Frequency, Poles and Slip Overview Energy Saving VFDs Reference

4. 2] Variable Frequency Drive Energy Saving Principle by Drive Multiplication Decrease (VT: Variable Torque)  HVAC Applications The application that its torque increases in direct proportion to multiplication of speed Example : FAN, Pump, Blower CT: Constant Torque The application that just needs constant torque Example : Conveyor CP: Constant Power The application that needs high torque at starting or low speed but does not need high torque at high speed Example : Dehydrator, Electric saw Torque Speed Torque Speed Characteristics of Torque depending on loads Power Overview Energy Saving VFDs Reference

5. 2] Variable Frequency Drive Energy Saving Principle by Drive Characteristics of FAN, Pump  HVAC Applications The most huge Energy saving effect (Multiplication Decrease) They can be started within 100% of rated current by Soft start Protection for excessive pressure in pipes, Protection for water-leakage Decrease noise of Fan, Pump Characteristics of Fan, Pump, Blower can be composed of shaft power, air volume and pressure by proportional expression 1) Air volume is in proportion to motor speed 2) Constant pressure is in proportion to multiplication of speed 3) Power is in proportion to the cube of motor speed Overview Energy Saving VFDs Reference

6. 2] Variable Frequency Drive Energy Saving Principle by Drive Compare Damper control with Drive control Power M M Controller FAN Require MeasureControl Damper Wind(Q) Power M M FAN Require Measure Damper Motor Wind(Q) Drive Motor R1 (1) Q1 Q2 A B H1 H2 (1/2) 0 N=50% Revolution Speed R2 R1 Constant (H) Pressure (1) Q1 Q2 A B H1 H2 (1/2) 0 N=100% Revolution Speed N=100% Revolution Speed Constant (H) Pressure Damper ControlDrive Control Air Volume(Q) Overview Energy Saving VFDs Reference

7. 2] Variable Frequency Drive Energy Saving Principle by Drive Calculate the amount of saved energy depending on the Motor Speed P1: Power (Before installation of Drive) P2: Power (After installation of Drive) N1: The number of revolution of motor (Before installation of Drive) (50Hz) N2: The number of revolution of motor (After installation of Drive) (45Hz, 40Hz) Considering the efficiency of Drive and extra factor, 27% of energy on average will be saved at 45Hz Operating at 45Hz Overview Energy Saving VFDs Reference

8. 3] Reference Overview Energy Saving VFDs Reference לאחר ניסיון שצברנו בתעשייה הגענו לחיסכון של 30%-60% בצריכת החשמל בעזרת ווסתי המהירות צריכת החשמל ירדה משמעותית במיוחד בעזרת מערכת בחוג סגור, כלומר מתמרי לחץ ומתמרי טמפרטורה למיניהם. דוגמא: התקנת ווסתי מהירות למשאבות וואקום עם מתמרי לחץ, צריכת החשמל ירדה בממוצע של מעל 60%. חום המנוע ירד גם הוא בצורה משמעותית. דוגמא 2: התקנת ווסת למפוח אוויר וירידה בתדר מ- 50 ל- 45 ירדה צריכת החשמל ב-30%. ראוי לציין שספיקת האוויר לא נפגעה והייתה מספקת. בכל מקרה,אחוז החיסכון במערכת בחוג סגור מושפע מכמות השימוש ושעות העבודה בעומס מלא ובעומס חלקי.