Would any one have a wiring diagram for such a hook up??? I want to use a enit in my Bowser DC trolley, but the motor needs DC to motor, while running off of AC track power.
Marty
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If you are referring to a conventional, electro-mechanical, E-unit, you need to understand what it is, how it works, and how it controls a series-wound A-C or D-C motor.
A series wound motor has two coils. One is called the field, and one is called the armature. To reverse such a motor, whether it is running on AC or DC, you reverse the polarity of one of either of the two coils, with respect to the other coil. An E-unit does this in a sequence of rotary movements. Some move from one polarity to the opposite without a neutral (unpowered) position, (2 positions) and some move from one polarity, through a neutral position, to a reversed polarity position, to another neutral position, and then back to the original polarity. (4 positions).
Your D-C motor is not a series-wound motor, and can be reversed simply by reversing the polarity of DC presented to it. An E-unit can be rewired to do this reversal, but the factory-intended hookup needs to be changed to accomplish this. Look at a diagram of an E-unit and you will see that the contacts create an output reversal from a constant polarity input. It is essentially a DPDT switch. Rewire it to get the polarity reversal applied directly to both sides of the motor. This will require isolating, from both rails, the two input leads to the motor.
Best bet is just get a new electronic E Unit. You can use one from any modern conventional engine with a can motor. That includes the Lionel starter set engines, all Williams engines as well as a Dallee aftermarket e unit. The guys who do lots of TMCC upgrades may have a few around for small money.
Pete
Easy-peasy. Here is the Williams Diagram for two motors wired in parallel. Just eliminate one motor connection for your trolley.
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