JDB-LQ+50正常運(yùn)行電機(jī)啟動(dòng)后,在正常運(yùn)行時(shí),電流互感器的取樣電位不會(huì)高于時(shí)基內(nèi)部比較電位。多諧振蕩電路也變成一個(gè)比較電路。NE556的OUT2輸出端⑨腳變成高電位,綠色發(fā)光二極管常亮,表示運(yùn)行正常。
●過載保護(hù)過載時(shí),R4上的取樣電位高于時(shí)基內(nèi)部比較電位。隨著過載量的加重或時(shí)間的增長,R4上的取樣電位會(huì)相對(duì)增加。因而,多諧振蕩電路頻率也會(huì)隨著增高。對(duì)應(yīng)NE556的OUT2輸出端⑨腳電位,高低交替變化(唯一不足的是:這種電機(jī)綜合保護(hù)器的電流取樣只有一相),一旦⑨腳電位變低,單穩(wěn)態(tài)電路電容C6開始充電,按照變化的頻率充電。當(dāng)電動(dòng)機(jī)過載電流倍數(shù)較大時(shí),對(duì)應(yīng)多諧振蕩脈沖中,低電平所占時(shí)間相對(duì)較長,這時(shí)C6充電速度較快;相反,當(dāng)過載電流倍數(shù)較小時(shí),C6充電速度較慢。這使得電動(dòng)機(jī)的過載保護(hù)具有反時(shí)限特性。達(dá)到整定的電流和時(shí)間后.JDB-LQ+50
EKD1C D系列
JD-7
JD-8
JD-9
GDH-20/1.2
GDH-20/2.5
GDH-20/5
GDH-20/10
GDH-20/20
GDH-20/25
GDH-20/40
GDH-20/60
GDH-20/80
GDH-20/100
GDH-20/180
GDH-20/300
EKGDH-20/1.2
EKGDH-20/2.5
EKGDH-20/5
EKGDH-20/10
EKGDH-20/20
EKGDH-20/25
EKGDH-20/40
EKGDH-20/60
EKGDH-20/80
EKGDH-20/100
EKGDH-20/180
EKGDH-20/300
EKGDH-24/6
EKGDH-24/20
EKGDH-24/60
EKGDH-24/100
EKGDH-24/200
EKGDH-24/300
EKGDH-24/600L
EKGDH-24/1000L
EKGDH-30/6
EKGDH-30/20
EKGDH-30/60
EKGDH-30/100
EKGDH-30/200
EKGDH-30/300
EKGDH-30/600L
EKGDH-30/1000L