X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from smtp1.av-mx.com ([137.118.16.57] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3731073 for flyrotary@lancaironline.net; Wed, 24 Jun 2009 12:45:04 -0400 Received-SPF: pass receiver=logan.com; client-ip=137.118.16.57; envelope-from=res12@fairpoint.net Received: from main (unknown [66.243.228.252]) (Authenticated sender: res12@fairpoint.net) by smtp1.av-mx.com (Postfix) with ESMTP id 267E8290989 for ; Wed, 24 Jun 2009 12:44:26 -0400 (EDT) Message-ID: <11779EF6668B4BFA9FC0562EC020910E@main> From: "Richard Sohn" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Relay Woes Date: Wed, 24 Jun 2009 11:44:56 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_009C_01C9F4C1.32642860" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5512 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_009C_01C9F4C1.32642860 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dave, this circuit is shows how to connect everything. Actually, the relay in = this picture control the ground leg of the load. So the diode is in = there the right way. If you want to control the +leg, you move the relay = to the other side of the load and connect the left sine to ground. However, is your relay is solid state, you would want to follow the = instruction in the data sheet. Hope this helps. Richard Sohn N2071U ----- Original Message -----=20 From: David Leonard=20 To: Rotary motors in aircraft=20 Sent: Wednesday, June 24, 2009 11:20 AM Subject: [FlyRotary] Re: Relay Woes I think I may have found the answer on page 10 here (although for a = slightly different relay). = http://www.components.omron.com/components/web/PDFLIB.nsf/0/77056031AB352= 22185257201007DD66B/$file/D20G3NA1205.pdf If so, is that diode symbol reversed? wouldn't that cause a short to = ground? Or do I need to install my pump so that the relay completes the = circuit to ground? Aaah, yes, thats it... will require an extra wire = out to the pump (located in wing). Still I dont really get it. Dave Leonard On Wed, Jun 24, 2009 at 8:34 AM, David Leonard = wrote: 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=3DsGAEpiMZZMtLEhJ5P%2f= NsZ6bnrz6%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). =20 Is it possibly because this relay is designed for an AC load? Other = suggestions? --=20 David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net http://RotaryRoster.net --=20 David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net http://RotaryRoster.net -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG - www.avg.com=20 Version: 8.5.339 / Virus Database: 270.12.90/2199 - Release Date: = 06/24/09 06:23:00 ------=_NextPart_000_009C_01C9F4C1.32642860 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Dave,

this circuit is shows how to connect = everything.=20 Actually, the relay in this picture control the ground leg of the load. = So the=20 diode is in there the right way. If you want to control the +leg, you = move the=20 relay to the other side of the load and connect the left sine to=20 ground.

However, is your relay is solid state, = you would=20 want to follow the instruction in the data sheet.

Hope this helps.

Richard Sohn
N2071U

----- Original Message -----

From:=20 David=20 Leonard

To: Rotary motors in = aircraft

Sent: Wednesday, June 24, 2009 = 11:20=20 AM

Subject: [FlyRotary] Re: Relay = Woes

I think I may have found the answer on page 10 here = (although=20 for a slightly different relay).

http://www.components.= omron.com/components/web/PDFLIB.nsf/0/77056031AB35222185257201007DD66B/$f= ile/D20G3NA1205.pdf

If=20 so, is that diode symbol reversed? wouldn't that cause a short = to=20 ground? Or do I need to install my pump so that the relay completes = the=20 circuit to ground? Aaah, yes, thats it... will require an extra = wire out=20 to the pump (located in wing). Still I dont really get = it.

Dave=20 Leonard

On Wed, Jun 24, 2009 at 8:34 AM, David = Leonard <wdleonard@gmail.com> wrote:

For you EE types, I have a question. I am = installing a=20 smoke system and wanted to use a relay to control the pump. I = bought=20 this relay from Mouser that I thought would do the trick:

http://www.mouser.com/Search/ProductDetail.aspx?qs=3DsGAE= piMZZMtLEhJ5P%2fNsZ6bnrz6%2f%252b%252bJvA50eSiydqPQ%3d

The=20 problem is that if there is any load (like the pump or even the = 0.02A=20 indicator LED I installed, then the relay will not turn off when I = turn off=20 the signal voltage. So either I do not understand how to use = the=20 relay, or I chose the wrong relay. I have checked my wiring = in-so-much=20 as to confirm that the signal voltage does turn on and off with the = switch,=20 voltage across the 'LOAD" terminals does disappear when there is no = load but=20 not when there is a load (current).

Is it possibly = because=20 this relay is designed for an AC load? Other = suggestions?

--=20
David Leonard

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

<= /DIV>

--
David Leonard

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

No virus found in this incoming message.
Checked by AVG = -=20 www.avg.com
Version: 8.5.339 / Virus Database: 270.12.90/2199 - = Release=20 Date: 06/24/09 06:23:00
------=_NextPart_000_009C_01C9F4C1.32642860--