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Watt-hour reading on Variable frequency drive:
On VFD Compressor loading time is 20hrs. & Unloading time is 4hrs.
Pressure set point is = 6.8Bar
On loading reading:
Sr. No. Voltage Current Pressure Motor RPM
1 400 V 40 A 6.4 Bar 800 - 1500 RPM
As the loading time is 20Hour in a day total power consumed is 498.20Kw
No loading reading:
Sr. No. Voltage Current Pressure Motor RPM
1 400 V 7 A 7.2 Bar 800 RPM
As the no loading time is 4 hour in a day total power consumed is 17.43Kw
Total power consumed on VFD in a day is = 515.63Kw.
If compare between star-delta & VFD energy consumed difference is = 109.96Kw. Total energy saving is around = 20-25%.
 
Advantages of running compressor on VFD over star-delta:
  Stabilized plant pressure   Reduced process variables
  Reduced system cycling   Reduced maintenance
  With Conventional Control   With Variable speed Control
  Investment pay back - Depend on load characteristics, Average 1 year pay back.
 
11% Purchase
5% Maintenance
84% Energy
  		12% Purchase
7% Maintenance
51% Energy
30% Saving
 
  Other important advantages of connecting VFD to the compressor :  
  1. Inrush current & inrush demand will reduce.
  2. As compressor is always on load condition, no fluctuations of demand will occur surge load on system, compressor life will increase.
  3. 20% energy saving due to reduction in copper losses, hysteresis losses & improvement in power factor to unity.
  4. Maximum demand will reduce & present P.F. of 0.8 will improve to unity.
  5. On generator, keeping present load constant, additional load can be given due to reduction in demand & absence of inrush current.
  6. Discharge temp. will reduce.
  7. Mechanical life of compressor will increase due to absence of load /unload pattern.
  8. Present starter will available as spare.
  9. Exact amount of CFM by production demand will be delivered with minimum power consumption.
 10. MSEB fluctuations in the voltage & frequency will not affect CFM delivery performance.
 11. Impact on dryer will reduce.
 12. Due to smooth acceleration & deceleration no stress on winding & bearing on motor.
 13. Reduce maintenance cost.
 14. Partial load efficiency of motor will improve.
 
   
 
 


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