Williams 00247 electronic reverse unit

[K-Dog]

I recently replaced a very noisy e-unit on my Lionel 2338 (vintage 1957) GP7 with a Williams 00247 electronic unit.  (Bridged the field winding with 4 1N5400 diodes to provide proper power flow through the field winding).  Performance is great, it's almost too quiet now, but I like it.  Would like to install a lockout switch to enable continuous direction running for MU lash ups.  Anyone know how this can be done?  Nothing in instructions from Williams on this.

K-Dog

[Joe Satnik]

Dear K-Dog,

Feed the armature winding (3,4) through a DPDT switch to choose between

(1,2) the electronic reverser board output or

(5,6) the +, - outputs of a diode bridge large enough to handle the stall current of your loco.  (Track power to ~ inputs) 

1 2
3 4   } Terminals on back of DPDT switch.
5 6

Mark the locos (subtly?)so you know which way they will go in lockout. 

Hope this helps.

Sincerely,

Joe Satnik

[K-Dog]

Thanks for the tip Joe.  Might try that.  Being new to the forum, I did not at first see the FAQ section.  After posting my topic, I found a solution there as well.  Figure between the two methods, I'll get it solved.

K-Dog

[Joe Satnik]

Are all motor wires isolated from the frame?

[K-Dog]

Joe - Yes, the armature and field are now isolated.  Previously one side of the field winding was tied to the frame ground.  I just had to clip that wire and connect it to one side of the bridge rectifier.   I also used a couple of 1N5400 diodes to provide directional head lights.

By the way, I added a Williams TrueBlast horn/bell module.  What a great "runner".

K-Dog