Position:Technology Center

Pedrail crane charges the reason that the system does not charge

From;    Author:Stand originally
Test site of my unit crane is debugging the discovery in the process of crane of crawler of a QUY50, whole circuit system has this opportunity report but ammeter indicates discharge, because be new machine, the possibility that thinks electric circuit has trouble consequently is not large, judging afore-mentioned phenomena from this is by charge fasten the breakdown that does not charge to cause. This machine uses the 18A of JF2511 Y28V / that total factory of Shanghai car electrical appliance produces alternator, to it the voltage regulator of form a complete set is adjuster of type of only course of FT221 odd couplet (embedded cut sheds relay) .



Attached drawing is part of QUY50 crawler crane electric principle graph. After starting engine, receive a mains switch S, press starting pushbutton A, cut sheds Q of the moving winding since relay; There is electric current to pass in, the magnetic field that electric current produces sheds cut relay contact K; Suck, make its close. As the movement of engine, dynamo voltage rises, neutral site voltage action is maintaining coil Q. On, because of coil Q; With Q. Medium voltaic direction is consistent, magnetic field increases, after engine works normally, a of loose starting pushbutton, maintain coil Q. Will maintain contact K; Continue to close. Right now, accumulator passes contact K; Offer magnetizing current to the dynamo, as dynamo rotate speed rise, when output voltage achieves rating, coil L; The magnetic field enough of generation overcomes the pulling force of bedspring, contact K. Suck, make its disconnect. Established ties in excitation circuit resistor R; With every, magnetizing current is reduced, dynamo voltage drops, coil L; Electric current is reduced accordingly in, attraction is abate, when attraction when insuperable bedspring is tensile, contact K. Close afresh again, output voltage lifts once more. Relapse so, made sure dynamo voltage is inside rating thereby. Additional, coil L. For demagnetization coil, joint action of it and diode D, absorb from feeling electromotive force in order to protect contact K. Not by ablation.
Classics examination, the degree of tightness of alternator drive leather belt is spent appropriate, the connect of each lead is taken off without apparent pine, because this is preliminary,judgement trouble spot is mixed in the alternator voltage regulator two yuan on parts of an apparatus. Dismantle the wire on column of next dynamo armature wiring above all, make alternator armature and come away of accumulator power source; In dynamo armature wiring column and those who build iron to contain down-lead only secondhand is small try the light (rated voltage 24 V) , make engine runs with inferior rotate speed, the result tries the lamp not to shine, confirm dynamo or excitation circuit have trouble. Will tear open the lead below to be received afresh next go up in column of dynamo armature wiring, with a fine copper column of wiring of armature of filar general alternator and column of magnetic field wiring make instantaneous weak point receive (this law is in theoretic do not allow, but want a method only in maintaining the job actually proper very practical however) , hair is short now as a result present instant, ammeter directive charges. This shows, charge the department does not charge is be caused by of voltage regulator breakdown. Change try afresh after voltage regulator machine, ammeter directive charges. Be in when engine below middling speed condition when the job, measure so that the midpoint voltage of the alternator is with avometer 14. 5 V, armature end outputs voltage for 28. 5 V, show breakdown already eliminated.
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