X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 31 Mar 2006 21:34:36 -0500 Message-ID: X-Original-Return-Path: Received: from mta10.adelphia.net ([68.168.78.202] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1054132 for lml@lancaironline.net; Fri, 31 Mar 2006 10:05:05 -0500 Received-SPF: pass receiver=logan.com; client-ip=68.168.78.202; envelope-from=glcasey@adelphia.net Received: from [70.34.70.106] by mta10.adelphia.net (InterMail vM.6.01.05.02 201-2131-123-102-20050715) with ESMTP id <20060331150419.MGYQ8301.mta10.adelphia.net@[70.34.70.106]> for ; Fri, 31 Mar 2006 10:04:19 -0500 Mime-Version: 1.0 (Apple Message framework v746.2) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-28-154016445 X-Original-Message-Id: <6AD22713-986B-4A43-81B1-8D2EC4FD0AC9@adelphia.net> From: Gary Casey Subject: Re: Starter Contactor X-Original-Date: Fri, 31 Mar 2006 07:04:17 -0800 X-Original-To: Lancair List X-Mailer: Apple Mail (2.746.2) --Apple-Mail-28-154016445 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed > I would strongly recommend using only an intermittent-duty > contactor for the starter. It is designed with a stronger return > spring and fewer turns in the coil, giving a more rapid "make" and > "break". This makes it less likely that the contacts will weld > upon opening, keeping the starter engaged. I also, I guess, fly > against the prevailing wind and would NOT put a clamping diode > around the coil. A diode there will slow down the flux decay and > increase the likelihood of welding. > > Gary Casey > > From: RWolf99@aol.com > Date: March 30, 2006 10:03:45 PM PST > Subject: Starter Contactor > >> Does anyone know if I can use the standard continuous-duty relay >> as a starter contactor? >> >> Typically we use the continuous duty relays, which are actually >> contactors, to throw the battery onto the power bus, and we use a >> slightly lighter (1 oz less) and slightly cheaper ($8 less) >> intermittent duty relay as the starter contactor. My particular >> installation would be aided by using the metal-can continuous-duty >> relay as a starter contactor -- it's all about existing mounting >> holes and clearance to adjacent equipment. The answer would be >> simple if I knew the rating of the two devices (these are the >> parts out of Aircraft Spruce or Aerocraft -- the usual suspects), >> so theoretical answers are not what I'm looking for. >> >> Thanks in advance. >> > --Apple-Mail-28-154016445 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1

I would = strongly recommend using only an intermittent-duty contactor for the = starter.=A0 It is designed with a stronger return spring and fewer turns = in the coil, giving a more rapid "make" and "break".=A0 This makes it = less likely that the contacts will weld upon opening, keeping the = starter engaged.=A0 I also, I guess, fly against the prevailing wind and = would NOT put a clamping diode around the coil.=A0 A diode there will = slow down the flux decay and increase the likelihood of = welding.

Gary = Casey


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