[GreenKeys] WU Modeal 2-A "Iron Horse" doesn't strike

Ethan Blanton elb at kb8ojh.net
Sat Jul 28 13:49:10 EDT 2018


Duncan Brown wrote:
> Are you putting 120V_AC_ or 120V_DC_ on the coils??

Well.  Color me stupid.  The schematic even says 120 V D.C., but for
some reason that just didn't register!  There's no label on my unit
(it's either missing, or it's been repainted, or something -- who
knows, in up to nearly 100 years!), and it has a regular two-prong
line cord, so I assumed it ran on 60 Hz 120 VAC -- which is a foolish
assumption, in retrospect, as old as the design is.

> The solenoids are designed for 120V*_DC_* (should be a label on the back)
> 
> I don't know what the DC current should be on that unit, but the punch on
> the M19 takes almost one amp.

Well, if the supply isn't supposed to limit the current, it's about
750 mA.  Which is a honker of a 120 VDC supply.  I'll have to see what
I can scrounge up around here...

Thanks, this was very helpful.  I'm not quite forty, perhaps some day
I will learn to read what is in front of me.  ;-)

Ethan


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