[GreenKeys] The motor start capacitor strikes back

[Sam Stinson]

Can you run a pair of them in series? That would give you 44-54mF.

> On Feb 24, 2018, at 16:22, Nick England <navy.radio at gmail.com> wrote:
> 
> 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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