bravokilo
Diesel Generator
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« Reply #3 on: July 27, 2009, 09:47:09 AM » |
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sudang, of course NO is normally open at NC normally closed. Usually and relay may middle contact at upperand lower contacts. Usually pahila sa baba ang coilso, NC and taas at NO and baba. ngayuon nka gang lang sila, meaning pwede maraming contacts sa isang coil. Ang throw ay yung up and down movement. Ilang contack sets ay tawag na poles. kaya kung isa set lang ng contacks, single pole,pag dalawa double pole etc...Kung may contact sa bab lang, single throw, kung baba at taas, double throw. Ang simbolo at SPST, SPDT,DPDT. Get na yan.
knayon, it's up to you to wire it up to make the relay latch. gawa namin sa crude car alarm nun. tungkul sa motor, well pag dc ez lang yun kasi reverse mo lang ang poles. Yung DPDT switch, kung bottom view may anim na paa. Ang battery mo sa gitna. ang motor mo sa isang side pair. Pero e cross connect mo yung two end pairs. Yan fward at rev na. Aplly mo sa relay.
Kapag induction motor, I can cover here the wash machine motor, single phase nga lang erp similar narin sa 3 phase. D na relay problem ito, kundi reversing motors(AC). and wahing machine motor at induction motor na may 2 windings. Yun main is called running wind, yung isa starting wind. Pero kapag permanent na may current yun second coil via a capacitor, di lang starting wind yun dahil tuloy tuloy din yun. Tawag din capacitor motr cya. Sa WM motor, actually parejo lang yun to winding na sinama yung dalawang ends nila na tinawag na
common. dto yung isang AC line, lets call it line 1. ngayon, ang capacitor(ac, wlang polarity yan) naka connect sa two other ends ng coil, say coil A and coil B. lagyan mo lang ng single pole, double throw dyan(SPDT). yung center sa line 2, yung ends (yung up and down contacks sa relay, dun sa coil A at coil B na may capacitor. you see, kung sa Coil A, cya ang running wire si B and capacitor wind. And VV.
BK
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