X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3731145 for flyrotary@lancaironline.net; Wed, 24 Jun 2009 13:44:53 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.120; envelope-from=eanderson@carolina.rr.com Received: from computername ([75.191.186.236]) by cdptpa-omta04.mail.rr.com with ESMTP id <20090624174414345.WRZH4077@cdptpa-omta04.mail.rr.com> for ; Wed, 24 Jun 2009 17:44:14 +0000 From: "Ed Anderson" To: "'Rotary motors in aircraft'" Subject: AC/DC or DC/DC [FlyRotary] Relay Woes Date: Wed, 24 Jun 2009 13:44:22 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001A_01C9F4D1.E1B5CCA0" X-Mailer: Microsoft Office Outlook, Build 11.0.5510 Thread-Index: Acn04Vge1WcyKSgTQWOoBp5GNwi8PwAEaKSg In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 Message-Id: <20090624174414345.WRZH4077@cdptpa-omta04.mail.rr.com> This is a multi-part message in MIME format. ------=_NextPart_000_001A_01C9F4D1.E1B5CCA0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Dave, I'm not a solid state relay expert (or even a novice). Solid state relays are somewhat more complex. However, I noticed that most of the solid state relays I came across seem to imply a DC voltage control of a much higher AC voltage. Here is one I found that specifically specifies DC control of DC voltage - which is the type I believe you are looking for. I have no idea if the DC/AC type can be made to work DC/DC. But, in any case, this is what I think you want: http://www.futurlec.com/Relays/SSRDC100V40A.shtml Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com http://www.dmack.net/mazda/index.html http://www.flyrotary.com/ http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.rotaryaviation.com/Rotorhead%20Truth.htm _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of David Leonard Sent: Wednesday, June 24, 2009 11:34 AM To: Rotary motors in aircraft Subject: [FlyRotary] Relay Woes For you EE types, I have a question. I am installing a smoke system and wanted to use a relay to control the pump. I bought this relay from Mouser that I thought would do the trick: http://www.mouser.com/Search/ProductDetail.aspx?qs=sGAEpiMZZMtLEhJ5P%2fNsZ6b nrz6%2f%252b%252bJvA50eSiydqPQ%3d The problem is that if there is any load (like the pump or even the 0.02A indicator LED I installed, then the relay will not turn off when I turn off the signal voltage. So either I do not understand how to use the relay, or I chose the wrong relay. I have checked my wiring in-so-much as to confirm that the signal voltage does turn on and off with the switch, voltage across the 'LOAD" terminals does disappear when there is no load but not when there is a load (current). Is it possibly because this relay is designed for an AC load? Other suggestions? -- David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net http://RotaryRoster.net ------=_NextPart_000_001A_01C9F4D1.E1B5CCA0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Dave, I’m not a solid state = relay expert (or even a novice). Solid state relays are somewhat more = complex.

 

 However, I noticed that most = of the solid state relays I came across seem to imply a DC voltage control of a much = higher AC voltage.

 

Here is one I found that = specifically specifies DC control of DC voltage – which is the type I believe = you are looking for.  I have no idea if the DC/AC type can be made to work = DC/DC.

 

But, in any case, this is what I = think you want:

 

http://www.fut= urlec.com/Relays/SSRDC100V40A.shtml

 

Ed

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of David Leonard
Sent: Wednesday, June 24, = 2009 11:34 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] = Relay Woes

 

For you EE types, I have a question.   I am installing = a smoke system and wanted to use a relay to control the pump.  I = bought this relay from Mouser that I thought would do the trick:

http://www.mouser.com/Sea= rch/ProductDetail.aspx?qs=3DsGAEpiMZZMtLEhJ5P%2fNsZ6bnrz6%2f%252b%252bJvA= 50eSiydqPQ%3d

The problem is that if there is any load (like the pump or even the = 0.02A indicator LED I installed, then the relay will not turn off when I turn = off the signal voltage.  So either I do not understand how to use the = relay, or I chose the wrong relay.  I have checked my wiring in-so-much as to = confirm that the signal voltage does turn on and off with the switch, voltage = across the 'LOAD" terminals does disappear when there is no load but not = when there is a load (current). 

Is it possibly because this relay is designed for an AC load?  = Other suggestions?

--
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net http://RotaryRoster.net

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