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压缩机调节功能知识
Regulating System 3 main principles Load / No Load (standard) Modulating Control (optional) Variable Speed Drive (VSD) GA in Load condition GA in No Load condition Power consumption:Load - No Load Load / No Load principle(standard regulating system) Load / No Load / Stop The Capacity Control system Compressed air supply is “matched” to the demand by throttling the air inlet valve. (The increased pressure drop reduces the air delivery) The power consumption remains near to maximum Power consumption:Modulation Capacity Control The Variable Speed Drive Compressor This concept is by far superior to Modulating controlled compressors. Because the power consumption is reduced accordingly to the compressed air demand Power consumption:Variable Speed Drive Variable Speed Drive (VSD) VSD-system: control principle Once the VSD is started, the pressure sensor readout is continuously compared with the programmed ‘SETPOINT’ pressure (Pload and Punload don’t exist anymore) If the net pressure is higher, the speed decreases If the net pressure is lower, the speed increases The implemented control algorithm is a Proportional and Integrating controller (PI) The usable compressor speed is limited by a Maximum and Minimum speed VSD closed loop regulation VSD in running condition * Power Capacity Power Capacity Load No Load 100 % 75 % 50 % 25 % 0 % 8,5 bar Capacity Power consumption Air pressure Legend: P = 100% P = 0% P = 20% V = 100% V = 0% 8 bar 0 2 4 6 8 10 12 14 16 18 20 Time (min) Working condition (L -NL - S) pressure (bar) 7 bar 6 bar Load No Load Stop Power Capacity Power Capacity Full Load 50% Modulation 100 % 75 % 50 % 25 % 0 % P = 100% P = 80% P = 20% V = 25 -50% V = 0% V = 100% 8,2 bar 7,8 bar Capacity Power consumption Air pressure Legend: Power Capacity Power Capacity 100 % 75 % 50 % 25 % 0 % 100% capacity 50% capacity P = 20% P = 100% P = 0% 8,1 bar 8 bar V=15 % V=100% V = 0 % Capacity Air pressure Legend: Power consumption Frequency converter Drive motor COM 1
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