6ES75317NF000AB0
6ES75317NF000AB0
6ES75317NF000AB0
6ES75317NF000AB0
6ES75317NF000AB0
我國工頻為50HZ，P為極對數(shù)，S為轉(zhuǎn)差率，那么調(diào)節(jié)電動機(jī)電源頻率就可調(diào)節(jié)電動機(jī)轉(zhuǎn)速，調(diào)節(jié)電機(jī)轉(zhuǎn)速也就是調(diào)節(jié)它的負(fù)載轉(zhuǎn)速，那么，根據(jù)風(fēng)機(jī)、水泵特性可知，調(diào)節(jié)風(fēng)機(jī)水泵的轉(zhuǎn)速可以達(dá)到調(diào)節(jié)流（風(fēng)）量的目的，同時，顯著調(diào)節(jié)軸功率。通過在水泵加裝變頻器，，則可實(shí)現(xiàn)自動調(diào)節(jié)控制，可使系統(tǒng)工作平緩穩(wěn)定。并通過變頻節(jié)能收回投資。如圖2所示，圖中陰影部分為同一臺水泵的工頻運(yùn)行狀態(tài)與變頻運(yùn)行狀態(tài)在隨著流量變化所耗的功率差。因此，隨熱負(fù)載而改變水量的變流量空調(diào)水系統(tǒng)顯示了巨大的優(yōu)越性。
2.2 變頻技術(shù)應(yīng)用：
中央空調(diào)系統(tǒng)采用變頻調(diào)速技術(shù)，電機(jī)可在很寬范圍內(nèi)平滑調(diào)速，可將所有節(jié)流閥去掉，使管道暢通，可免去節(jié)流損耗。通過改變電機(jī)轉(zhuǎn)速而改變水的流速，從而改變水流量，達(dá) 到制冷機(jī)正常工作要求和平衡熱負(fù)荷所需冷量要求，達(dá)到節(jié)能目的。采用變頻調(diào)速技術(shù)的關(guān)鍵是電機(jī)轉(zhuǎn)速的可調(diào)和可控。電機(jī)的變頻調(diào)速系統(tǒng)是由PLC控制器進(jìn)行切換和控制的。
ABB Asea Brown Boveri S272-K16A Circuit Breaker 277/460
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FISCHER & PORTER ABB 10A500 Flowmeter 10L/Min, 1" 316SS
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POST GLOVER RESISTORS INC ABB-48431-004 USPP ABB4843100
ABB NAMC-03 MOTOR board for ACS600 drives, PN NAMC03
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ALLEN BRADLEY 1326AB-B720E-S2K7L NSPP 1326ABB720ES2K7L
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ABB THERMAL OVERLOAD RELAY PROTECTION GJZ 252 1201 R004
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ABB 3BSE008544R1 AI820
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3HAB 4514-1/5 Recertified from ABB
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