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| Re: train with mechanical problems (607068) | |||
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Re: train with mechanical problems |
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Posted by Jeff H. on Fri Apr 25 00:45:48 2008, in response to Re: train with mechanical problems, posted by trainsarefun on Thu Apr 24 21:03:24 2008. This is called "spotting current". During coast, the circuit isset up for dynamic braking, but the fields are shunted and the current regulator is set very low. The drag is imperceptible. The reason for this arrangement, as opposed to just leaving the circuit open for a true coast, is so that when dynamic brake is actually called by the movement of the brake handle, the proper amount of dynamic brake current (corresponding to the amount of brake effort desired) will flow almost instantly, without overshoot. |
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