[GreenKeys] ASR LMU12 Motor

[John, W9DDD]

As my grandfather used to say.

We get too soon old and too late smart.

John, W9DDD

On 1/3/2021 3:58 PM, Steve Garrison wrote:
> As others have pointed out to me as well.  At least I’m getting better 
> educated.  Too bad it is happening so late in life! 😊
> 
> SG
> 
> *From:* w9ddd at tapr.org <w9ddd at tapr.org>
> *Sent:* Sunday, January 3, 2021 3:55 PM
> *To:* N4TTY at ARRL.NET
> *Cc:* Greenkeys <greenkeys at mailman.qth.net>
> *Subject:* Re: [GreenKeys] ASR LMU12 Motor
> 
> Hi Steve,
> 
> I can't picture hoe the motor could over speed.
> 
> What part of the motor did it touch?  Does your motor have the ground 
> strap between motor housing and the cradle or base?
> 
> Do your have other words to describe the sound?
> 
> John, W9DDD
> 
> 
> On Jan 3, 2021, at 1:38 PM, Steve Garrison <steve.n4tty at gmail.com 
> <mailto:steve.n4tty at gmail.com>> wrote:
> 
>     OK, folks what can go wrong with a synchronous motor that can make
>     it seem to be turning at a much higher RPM than it should be?
> 
>     I had a mishap that shorted a wire against the motor that caused a
>     spark, a pop, and the fuse in the LESU blowing.  After removing the
>     short, replacing the fuse, then powering back up, the machine was
>     running but “sounded funny!”  After removing the typing unit and
>     powering backup I still had the
>     “funny” sound, just not quite as loud.  Without the typing unit it
>     was just the motor and the reperf churning.  The TD drive shafts had
>     been removed earlier.
> 
>     My feeling is the “funny” noise is the mechanisms running at a
>     higher RPM than designed.
> 
>     I still need to repair the shorted wire, but it isn’t part of the
>     motor circuit anyway.
> 
>     Steve G./N4TTY
> 
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