X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [206.46.252.48] (HELO vms048pub.verizon.net) by logan.com (CommuniGate Pro SMTP 5.0c2) with ESMTP id 718124 for flyrotary@lancaironline.net; Sun, 11 Sep 2005 01:19:25 -0400 Received: from verizon.net ([71.99.193.113]) by vms048.mailsrvcs.net (Sun Java System Messaging Server 6.2 HotFix 0.04 (built Dec 24 2004)) with ESMTPA id <0IMN00BP4043U2F6@vms048.mailsrvcs.net> for flyrotary@lancaironline.net; Sun, 11 Sep 2005 00:19:16 -0500 (CDT) Date: Sun, 11 Sep 2005 01:19:10 -0400 From: Finn Lassen Subject: Re: [FlyRotary] Re: Overvoltage control (help Ed A) In-reply-to: To: Rotary motors in aircraft Message-id: <4323BE4E.7070207@verizon.net> MIME-version: 1.0 Content-type: multipart/alternative; boundary=------------030302010608080702070301 X-Accept-Language: en-us, en References: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax; PROMO) This is a multi-part message in MIME format. --------------030302010608080702070301 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Two different issues. 1) Voltage regulator failure feeding full voltage to the field winding making the alternator put out as much as it possibly can, probably 90 or more volts if not prevented by battery load. 2) Shorting of one or more of the rectifier diodes in the alternator which might result it in putting out an AC voltage, but more likely result in no output. Finn Tim Andres wrote: > I could be wrong but I don't believe the rectifiers are going to be > found anywhere but in the alternator. Moving to an external regulator > will not affect their environment. > > Tim Andres > > > > ------------------------------------------------------------------------ > > From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] > On Behalf Of Jim Sower > Sent: Saturday, September 10, 2005 5:49 PM > To: Rotary motors in aircraft > Subject: [FlyRotary] Re: Overvoltage control (help Ed A) > > > > Finn Lassen wrote: > > I suspect that the regulators in our alternators are very > reliable, providing they are adequately cooled. That would be one > advantage for having a external regulator: it can be mounted in a > cooler location. > --------------030302010608080702070301 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Two different issues.
1) Voltage regulator failure feeding full voltage to the field winding making the alternator put out as much as it possibly can, probably 90 or more volts if not prevented by battery load.

2) Shorting of one or more of the rectifier diodes in the alternator which might result it in putting out an AC voltage, but more likely result in no output.

Finn

Tim Andres wrote:

I could be wrong but I don’t believe the rectifiers are going to be found anywhere but in the alternator. Moving to an external regulator will not affect their environment.

Tim Andres

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Jim Sower
Sent: Saturday, September 10, 2005 5:49 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Overvoltage control (help Ed A)

Finn Lassen wrote:

I suspect that the regulators in our alternators are very reliable, providing they are adequately cooled. That would be one advantage for having a external regulator: it can be mounted in a cooler location.

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