. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . FIG. I. WIRING OF SAFET\ CIRCUITCONTROLLER. each lever in the machine to furnishalternating current for the inductionmotor. In throwing a switch from normal toreverse the tower man moves its leverfrom left to right. When he has com-pleted the preliminary movement of thelever he is stopped by the segmentcoming intf. contact with the latch. Assoon as the preliminary movement isstarted current is supplied to the motorthrough the proper field coil and themotor begins to revolve. The switchis unlo
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . FIG. I. WIRING OF SAFET\ CIRCUITCONTROLLER. each lever in the machine to furnishalternating current for the inductionmotor. In throwing a switch from normal toreverse the tower man moves its leverfrom left to right. When he has com-pleted the preliminary movement of thelever he is stopped by the segmentcoming intf. contact with the latch. Assoon as the preliminary movement isstarted current is supplied to the motorthrough the proper field coil and themotor begins to revolve. The switchis unlocked, thrown and locked in itsnew position as already explained. Themagnetic clutch disconnects the camdrum shaft and the operating wire isshifted to the indicating brush. As aresult a pulsating current flows throughthe primary of the transformer in the. MAGNETS—. SECTION OF OPERATING CYLINDER. interlocking machine and generates inits secondary coil an alternating cur-rent. This alternating current drivesthe induction motor causing the ballsto fly apart, lifting the indicating permits the tower man to completethe movement and tells him that theswitch has correctly followed the move-ment of its lever. The purpose of the safety controlleris to prevent the operation of theswitch by stray currents wliich mightleak in, possibly due to an accidental grounding or short circuiting of thewires. This is quite as important as theobtaining of a proper indicating cur-rent, because if a stray current shouldreach a switch or signal motor, caus-ing an improper movement of theswitch or signal, the consequencesmight be serious. Fig. i illustrates thewiring of the safety circuit controllerdivested of all unnecessary circuits. Inthis .figure, N and R are the normaland reverse operating wires respectively;F and F are the two field coils of th
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