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Re: [TowerTalk] Tower Lighting

To: <ve3zi@rac.ca>, "Tower and HF antenna construction topics." <towertalk@contesting.com>
Subject: Re: [TowerTalk] Tower Lighting
From: "Mark Robinson" <markrob@mindspring.com>
Reply-to: "Tower and HF antenna construction topics." <towertalk@contesting.com>
Date: Wed, 21 Apr 2010 16:13:54 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
You could look at zero crossing detecting solid state relays or 
alternatively add a series current limiting resistor which is shorted out by 
a second relay after a fixed time interval.  Maybe try a beefier relay and 
see how much longer that will last.


http://www.power-io.com/products/dda5075100.htm

http://www.seagatecontrols.com/catalog.asp?prodid=595593&showprevnext=1



Mark



----- Original Message ----- 
From: "Roger Parsons" <ve3zi@yahoo.com>
To: <towertalk@contesting.com>
Sent: Wednesday, 21 April, 2010 2:42 PM
Subject: [TowerTalk] Tower Lighting


>I have access to a 325' tower for my remote station, and like to assist the 
>tower owner where possible.
>
> The tower lighting is controlled by a light sensistive switch working a 
> relay which actually controls the lights. The relay controller appears to 
> be home made and did have a large open frame relay in it - until the 
> contacts completely disappeared! (The actual load from the lights is about 
> 1200w on each of two phases.) I replaced the relay with a 30A contactor 
> which I thought was overkill and it was fine for several years, but that 
> is now getting unreliable. Clearly there is a pretty heavy switch on surge 
> with incandescent lamps, but this must be true at all tower sites.
>
> What do the professionals do? (I suspect the answer to that is spend 
> several thousand dollars with Cutler-Hammer.....)
>
> 73 Roger
> VE3ZI
>
>
>
>
>
>
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