Amp Supply mounted a thermal switch thru the side of a red silicone chimney
in their 3CX800 series of amps. For the LK-550 it was mounted next to one of
the three 3-500's. Its purpose was to switch the air flow from silent mode
to something approaching loud. I usually make changes that speeds up the one
and slows down the other a bit.
Carl
KM1H
----- Original Message -----
From: "Jeff Blaine" <keepwalking188@yahoo.com>
To: "Gary Smith" <wa6fgi@sbcglobal.net>; <amps@contesting.com>
Sent: Monday, November 08, 2010 4:34 PM
Subject: Re: [Amps] time to death in the event of a blower failure
> Thanks Gary,
>
> I am familuar with those. The similar button-type is used on the HVAC
> stuff. They are easier to get than the TO220 sized which seems to be a
> single-supplier thing.
>
> The button type is larger but I am thinking that it would be easy to cut a
> hole in the chimney and mount it through the side. Otherwise, it’s the
> same benefits as the other switch...
>
> 73, Jeff ACØC
> www.ac0c.com
>
>
> From: Gary Smith
> Sent: Monday, November 08, 2010 11:47 AM
> To: Jeff Blaine ; amps@contesting.com
> Subject: Re: [Amps] time to death in the event of a blower failure
>
> Pick a temp figure you like everything to come to a halt at. Then head
> for a appliance part store and ask for a dryer safety cutout sensor at
> that temp figure. They are available in either one then cut off, or off
> then on. The guy behind the counter won't understand the app, but he will
> know about the switch.
> 73, Gary...wa6fgi
>
>
>
> ----- Original Message -----
> From: Jeff Blaine
> To: amps@contesting.com
> Sent: Sunday, November 07, 2010 8:27 PM
> Subject: [Amps] time to death in the event of a blower failure
>
> The traditional monitor for a failed blower is a air pressure sensor.
> But this is harder to implement with a variable speed fan arrangement.
>
> I was working on a fail-safe for this case and thought a solution.
> Wanted to run that idea by the board to see what the comments are...
>
> Here’s the idea...
>
> 1. The cut-out mechanism would be one of these TO220 sized bimetal
> switches. They are available in a variety of trip points.
>
> 2. The switch has no electronics inside and should be RF immune.
>
> 3. The switch can be set in the chimney near the silicon wall and would
> not significantly impede airflow.
>
> 4. The switch has a very low thermal mass and will switch quickly.
>
> 5. Even with a failed blower, the tube would be dissipating tons of heat
> and convection would ensure heat-up of the switch.
>
> 73, Jeff ACØC
> www.ac0c.com
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