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| Re: controller Re: LIRR MP-54 #1149 and its ME-23 brake valve (485695) | |||
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Re: controller Re: LIRR MP-54 #1149 and its ME-23 brake valve |
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Posted by randyo on Tue Sep 4 14:38:20 2007, in response to Re: controller Re: LIRR MP-54 #1149 and its ME-23 brake valve, posted by SelkirkTMO on Mon Sep 3 22:59:42 2007. The only difference between the LIRR cars and the BMT BU/Qs was that the controller handle on the BUs attached to an external shaft on the controller box whereas on the LIRR, the controller handle also had a shaft which inserted into a hollow shaft that was flush with the front of the controller box. This upgrade actually made sense since on a BU, one could actually take a pair of pliers or an adjustable wrench and operate the controller whereas on the modified model, the proper controller handle was neccessary to operate the device. There were actually 2 different types of this controller. The type used on the LIRR and also by the way , the New Haven washboards needed a small lever sometimes referred to as a "butterfly" in addition to the controller handle to activate the controller. it had 4 positions: off, then to the left of off were control and control with electric brake, and to the right of off was reset. On the Pennsy MP54s and also the Jersey Arrows, instead of the butterfly, a plug similar to the BMT/IND brake plug was used to activate the controller. When the plug was inserted 1/2 way into the recepticle, it energized only the control circuit. When it was fully inserted, it energized control with electric brake and a seprate recepticle was used for reset. In both cases the the engineer would have to deenergize both the motor control and electric brake circuits in order to reset the motors. Removing the plug or placing the butterfly in the off position also deactivates the deadman's feature on the controller allowing the engineer to rest at stations with long standing times. On the BU controller, there was a drop latch on the back of the controller which could lock deactivating the deadman's feature on that type of controller but as soon as the M/M would place the controller on the first point, the latch would drop down reactivating the feature should the M/M release it. |
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