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How do Dynamic Brakes work??
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As you may know, locomotives are diesel-elect. So..the diesel spins an alternator, the juice passes thru a rectifier, now it's dc power. On ACs an invertor is used. This power is wired to the traction motors on the trucks for power. For d.b., the electricsl circuits are re-arranged, turning the motors themselves into generators. Since it takes power to turn a generator, the speed of the train, now shoving the engine, is retarded. On a typical loco. consist (d.c.), we start with 2-300 amps, and increase the amperage with the top handle on the controller, to retard the train. Also, since we're generating elect. here, the juice is wired to grids..those blisters on the top sides of the older locomotive, sort of concealed behind grills on the newer ones. The grids absorb the energy and dissipate it. <br />Terry...l-o-n-g time BN engr.
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