Mailing List flyrotary@lancaironline.net Message #56395
From: Ernest Christley <echristley@att.net>
Subject: Re: [FlyRotary] The Case for Solid state Relays (SSR)
Date: Tue, 23 Aug 2011 13:23:44 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Kelly Troyer wrote:

Ed & Group,
       I brought up the question of possible use of Solid State Relays (SSR) to replace the
electro-mechanical contactors most of us use in our flying electrical systems but I need to depend on the smarter "EE" (Electronic Engineer) types of our group to tell me if this
would be a good idea......
 
http://www.power-io.com/products/hdd.htm
 
http://www.power-io.com/library/databulletin/hdd-family.pdf
 
http://www.power-io.com/library/databulletin/hdd-e-family.pdf
  

I tried using one of these.  I know my situation is different, in that I'm using a generator, not an alternator.  The issue I ran up against is that the regulator could not sense the bus voltage, and never turned on.  It least, that is what I suspect the problem was.  I wasn't getting any voltage out of the regulator with the SSR installed.  I replaced it with a fusible link, and now everything works just fine.
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