My swag would be open main winding, but would the start winding pull enough current to trip the overload?  Perhaps?  Never thought about the start winding having any function other than getting things going in the right direction.  Perhaps it is the source of a lot of the inrush current during starting.  Motors course was my least favorite course ... well maybe thermodynamics makes it the second least favorite? 

Now that I think about it, if the main winding was open, then the start relay wouldn't engage the start winding.  How about one of the two windings being shorted? 

Bad start relay acts the same as bad cap in my past experience.

What would happen if the cap was shorted?  No phase shift performed, doesn't know which way to turn.  Would think the push would still get it going?


---
----
You said "tomorrow" yesterday.

The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD
On 8/2/2022 12:37 PM, Duncanancy wrote:


Turned on my 28 RT today and the motor hummed for a minute and then tripped the thermal overload.
I can turn the motor by hand and it seems normal resistance. When powered, it just seems to wiggle back and forth. Giving a push in the proper direction does nothing. 

(On another M28 , the motor would not run until you gave it a push - then it would run. Replacing the motor start cap fixed it.)

But on this 28RT, giving a push doesn't make it run.

Does this sound like the motor start cap?  Any good sources for M-S cap?

Thanks,  

Duncan
K2OEQ


Sent from my Kleinschmidt TT-4/TG, the US Army's first portable digital communications device, 1950-1980





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