X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao101.cox.net ([68.230.241.45] verified) by logan.com (CommuniGate Pro SMTP 5.1.11) with ESMTP id 2245818 for flyrotary@lancaironline.net; Mon, 06 Aug 2007 13:16:48 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.45; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao101.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20070806171609.FHAZ2095.fed1rmmtao101.cox.net@fed1rmimpo02.cox.net> for ; Mon, 6 Aug 2007 13:16:09 -0400 Received: from BigAl ([72.192.132.90]) by fed1rmimpo02.cox.net with bizsmtp id YhG81X00G1xAn3c0000000; Mon, 06 Aug 2007 13:16:08 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Alternator drawing current at rest. Date: Mon, 6 Aug 2007 10:18:25 -0800 Message-ID: <000801c7d856$2e2d8270$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0009_01C7D813.200A4270" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0009_01C7D813.200A4270 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: [FlyRotary] Re: Alternator drawing current at rest. =20 Yep, that was the problem. I had it wired so that the field windings = were active whenever there was power to the system. I did that to cut down = on audio noise, but have decided to bring the field lead back into the = cabin so I can control it. Will add a filter and live with the remaining noise.=20 =20 Dave Leonard =20 Dave; =20 I don't think the field current is a noise issue; it's the output that = can be noisy. I think you'd like to have the field supply come to a breaker = on the panel, with a 'crowbar' over voltage protection. I used a 7.5A = pullable breaker, so on a occasion where I might be sitting with the engine off, = and the power on for extended duration for some reason (like figuring out = how to program the flight plan into the GPS), I can pull the breaker to reduce = the battery draw. =20 Al =20 On 8/5/07, Al Gietzen wrote:=20 Subject: [FlyRotary] Alternator drawing current at rest. =20 That current draw for the coils did seem high, so I checked further into = it. Turns out it is the alternator drawing the 3 amps, not the coils. It = gets warm to the touch. Is that normal?=20 =20 Dave Leonard Sounds about right. I measured the field winding draw at about 2.5 A, engine off. =20 Al =20 --=20 David Leonard Turbo Rotary RV-6 N4VY=20 http://N4VY.RotaryRoster.net http://RotaryRoster.net=20 ------=_NextPart_000_0009_01C7D813.200A4270 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Subject: [FlyRotary] Re: Alternator drawing current at rest.

Yep, that was the problem. I had it = wired so that the field windings were active whenever there was power to the system. I did that to cut down on audio noise, but have = decided to bring the field lead back into the cabin so I can control it. Will = add a filter and live with the remaining noise.

Dave Leonard

Dave;

I don’t think the field = current is a noise issue; it’s the output that can be noisy. I think = you’d like to have the field supply come to a breaker on the panel, with a = ‘crowbar’ over voltage protection. I used a 7.5A pullable breaker, so on a = occasion where I might be sitting with the engine off, and the power on for extended duration for some reason (like figuring out how to program the = flight plan into the GPS), I can pull the breaker to reduce the battery = draw.

Al

On = 8/5/07, Al Gietzen <ALVentures@cox.net> wrote:

Subject: [FlyRotary] Alternator drawing current at rest.

That current draw for the coils did seem = high, so I checked further into it. Turns out it is the alternator drawing = the 3 amps, not the coils. It gets warm to the touch. Is that = normal?

Dave Leonard

Sounds about right. I measured the field winding draw at about 2.5 A, engine = off.

Al

--
David Leonard

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

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