X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from nm14.access.bullet.mail.sp2.yahoo.com ([98.139.44.141] verified) by logan.com (CommuniGate Pro SMTP 5.4.1) with SMTP id 5101593 for flyrotary@lancaironline.net; Tue, 23 Aug 2011 19:04:12 -0400 Received-SPF: none receiver=logan.com; client-ip=98.139.44.141; envelope-from=keltro@att.net Received: from [98.139.44.99] by nm14.access.bullet.mail.sp2.yahoo.com with NNFMP; 23 Aug 2011 23:03:36 -0000 Received: from [98.139.44.70] by tm4.access.bullet.mail.sp2.yahoo.com with NNFMP; 23 Aug 2011 23:03:36 -0000 Received: from [127.0.0.1] by omp1007.access.mail.sp2.yahoo.com with NNFMP; 23 Aug 2011 23:03:36 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 489950.36801.bm@omp1007.access.mail.sp2.yahoo.com Received: (qmail 68431 invoked by uid 60001); 23 Aug 2011 23:03:36 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=att.net; s=s1024; t=1314140615; bh=oa8M1pqu0FNtM1SlL2fLdcUBF/nBtDyZGEjl83t39ng=; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=tuIZO9Rxmx5oktArgow578ZXLjB4jDcmNXL1ZzQu5CnwpiFk1mcg9XLfMQ/9UiYtDgbELzN9Qf5GVKrF1KOhcglbrETUgzt3D0OJmCse6WkyBHgcScRH5Eb4FJJqukxhlylbIllzlK8eHLmZq3c85Hi4CMsm7ze8/b6mJvIH//Q= DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=att.net; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=E9louX6unYHsdVY9VBKy7lVpdbWUxnhklK6m6gN5r83fOhalZPPj524A64iwKTspLcOBqdBWI85WCKxutuDHu24UqPCuTcpvS+XAWqd3LjZio5C3amr+MOELrSicMCjHx9dyZov9fRNL6sqYFfwuuZo7SlZxF4A52OQl7n9m4IQ=; X-YMail-OSG: O6gLzIoVM1nprMU8QNpe_Uvpj1O7oiVqZ2DwyemO3Jfr4Na CfuvEUGUe9JN5XxKv_bS0JpOaeHy0T6y0X6NMq3W6Em7EQKDmIPUCJ1CXQkT 7cAItb9yuL41IfD2Sig0tJazKp9IvzJybhdazZLPzFCQS3x4mFzUDacmBafd VE1xraSNnp6v5IbCqymUnKU7s6jqm2LRbKdWtViAc9iHktDEYfgzAR6psidU Re7zIA9Qm7znUcPbMOoGziOK3nXRXxMsqzRnAWA1bUfEabO4AF8h.lUwXH64 E5NmmF0dMxmrVF5hwizAznTyGCMxIZocJolvGwkZGHHaYfRGHrPsUx5bUrC2 qdNezsGLd_SxtEhd0ChBkCsAF1foEQcjrsNgYUESl2XMIVrr1lTVFHIUgZh_ SeXBxEB7frUmw2SCWi_DeYtNB1Zor.7ujMOMdA3Tpoo5N.Fkc9OvEFjnsBCt 0gk8FltPKOP5iVEMUC2Y- Received: from [208.114.32.15] by web83916.mail.sp1.yahoo.com via HTTP; Tue, 23 Aug 2011 16:03:35 PDT X-Mailer: YahooMailWebService/0.8.113.313619 References: Message-ID: <1314140615.60541.YahooMailNeo@web83916.mail.sp1.yahoo.com> Date: Tue, 23 Aug 2011 16:03:35 -0700 (PDT) From: Kelly Troyer Reply-To: Kelly Troyer Subject: Re: The Case for Solid state Relays (SSR) To: Rotary motors in aircraft In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-781813009-1314140615=:60541" --0-781813009-1314140615=:60541 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Ernest,=0A=A0=A0=A0=A0 Then the PM alternator is you only elect=A0power sou= rce ??............=0A=0AKelly Troyer=0A"DYKE DELTA JD2" (Eventually)=0A"13B= ROTARY"_ Engine=0A"RWS"_RD1C/EC2/EM2=0A"MISTRAL"_Backplate/Oil Manifold=0A= "TURBONETICS"_TO4E50 Turbo=0A=0AFrom: Ernest Christley =0ATo: Rotary motors in aircraft =0ASent: Tu= esday, August 23, 2011 2:53 PM=0ASubject: [FlyRotary] Re: The Case for Soli= d state Relays (SSR)=0A=0AKelly Troyer wrote:=0A> Ernest ,=0A>=A0 =A0 Are y= ou saying that when your SSR was activated it would not allow battery volta= ge to your=0A> PM alternator regulator ??=0A=0AYes.=A0 And a short investig= ation uncovered information that the regulators are designed so that they h= ave to sense a voltage before they'll turn on.=A0 Not an issue when control= ling a motor, as Jarrett is considering, but a complete deal breaker when t= hat supply line is also the monitoring line.=0A=0AIf used to control an alt= ernator, the sense line would need some scheme to bypass the SSR.=A0 The el= ectrons only flow in one direction through the SSR, so the sense line will = have to be on the battery side.=0A=0AI'm not an EE.=A0 Lots of other people= know more about this than I.=A0 YMMV.=A0 Void where prohibited. ETC.=0A=0A= I replaced the SSR with a 60A fusible link.=A0 If the 38A generator blows t= hat, it ain't coming back into service on that flight anyway.=A0 I thought = about replacing it with a contactor, but I already have a limited power bud= get.=A0 A mechanical switch was a possibility, but the cabling and linkage = start to become a headache.=A0 At some point you have to admit that it is a= VFR machine, and the extra complexity is going to cause more problems than= it solves.=0A=0A--=0AHomepage:=A0 http://www.flyrotary.com/=0AArchive and = UnSub:=A0 http://mail.lancaironline.net:81/lists/flyrotary/List.html --0-781813009-1314140615=:60541 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Ernest,
   &n= bsp; Then the PM alternator is you only elect power source ??.........= ...
 
Kelly Troyer
"DYKE DELTA JD2" (Eventually)
"13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil = Manifold
"TURBONETICS"_TO4E50 Turbo

From:= Ernest Christley <echristley@nc.rr.com>
To: Rotary motors in aircraft <flyrota= ry@lancaironline.net>
Sent: Tuesday, August 23, 2011 2:53 PM
Subject: [FlyRotary] Re: The Case for Solid state Relays (S= SR)

Kelly Troyer wrote:
> Ernest ,
>   = Are you saying that when your SSR was activated it would not allow battery= voltage to your
> PM alternator regulator ??

Yes.  And a= short investigation uncovered information that the regulators are designed so th= at they have to sense a voltage before they'll turn on.  Not an issue = when controlling a motor, as Jarrett is considering, but a complete deal br= eaker when that supply line is also the monitoring line.

If used to = control an alternator, the sense line would need some scheme to bypass the = SSR.  The electrons only flow in one direction through the SSR, so the= sense line will have to be on the battery side.

I'm not an EE. = ; Lots of other people know more about this than I.  YMMV.  Void = where prohibited. ETC.

I replaced the SSR with a 60A fusible link.&n= bsp; If the 38A generator blows that, it ain't coming back into service on = that flight anyway.  I thought about replacing it with a contactor, bu= t I already have a limited power budget.  A mechanical switch was a po= ssibility, but the cabling and linkage start to become a headache.  At some point you have to admit that it is a VFR machine, = and the extra complexity is going to cause more problems than it solves.
--
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