[GreenKeys] The motor start capacitor strikes back

[Nick England]

As I said in recommending these caps, they are not the correct value for
the larger M28 motor but they have worked fine for me to replace the
88-108. And you cannot find anything else that will fit.
These are NOS caps for the M33 motor and the value is also correct for the
miniature M28 TD motor.
I think NOS caps have a much better chance of working than old oil-soaked
ones that have spent years cuddled up to a hot motor.
Nick


On Sat, Feb 24, 2018 at 4:31 PM Ethan Blanton <elb at kb8ojh.net> wrote:

> Hello again,
>
> My NEMA ML-3R plugs are in hand, and I've wired up both the LPR and
> LPW.  Thanks again!
>
> However, I'm back to motor start capacitors.  After a previous
> exchange, I ordered some 88-108 mF motor start capacitors from a
> surplus site.  I just cracked open the motor unit on the LXD, though,
> and -- wah wah waaaaaah -- while the new cap is the right physical
> size to fit under the motor, the cap in place right now is 43-48 mF,
> not 88-108!  I don't know exactly what the situation is for these
> synchronous motors, but I know that in other circumstances that could
> cause the starting relay to fail to kick out in a timely fashion,
> damaging either the motor or the starting capacitor (or both).
>
> So ... anyone have a source on starting capacitors of the correct
> value?  I'm slowly putting together an order to quote from our friend
> Paul at RTTY Electronics (containing a whole smattering of parts), so
> perhaps I'll try that route, but I suspect surplus Teletype corp
> starter caps aren't substantially newer than the failed caps that are
> already in place.  ;-) I've been looking again, and motor start
> capacitors small enough to fit under that sub-chassis still do not
> seem to be a thing I can find.
>
> Ethan
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-- 
Nick England K4NYW
www.navy-radio.com
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