[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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