X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 07 May 2012 07:51:20 -0400 Message-ID: X-Original-Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120] verified) by logan.com (CommuniGate Pro SMTP 5.4.5) with ESMTP id 5525198 for lml@lancaironline.net; Sun, 06 May 2012 20:17:02 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.120; envelope-from=super_chipmunk@roadrunner.com X-Original-Return-Path: X-Authority-Analysis: v=2.0 cv=bLSU0YCZ c=1 sm=0 a=+kuJ7Sa7hUpxs7xJxzDFzQ==:17 a=AeF9CLZUGkAA:10 a=zTVDa7HKqxcA:10 a=HXIezJXOTeTjT-61fwQA:9 a=pILNOxqGKmIA:10 a=6FNVZrFCaRr6Lr_0WKEA:9 a=_W_S_7VecoQA:10 a=+kuJ7Sa7hUpxs7xJxzDFzQ==:117 X-Cloudmark-Score: 0 X-Originating-IP: 76.179.81.18 Received: from [76.179.81.18] ([76.179.81.18:52074] helo=WilliamHP) by cdptpa-oedge03.mail.rr.com (envelope-from ) (ecelerity 2.2.3.46 r()) with ESMTP id 68/71-29249-C5417AF4; Mon, 07 May 2012 00:16:29 +0000 X-Original-Message-ID: From: "Bill Wade" X-Original-To: "Lancair Mailing List" References: In-Reply-To: Subject: Contactor test X-Original-Date: Sun, 6 May 2012 20:16:28 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0025_01CD2BC5.1E699500" X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 15.4.3555.308 X-MimeOLE: Produced By Microsoft MimeOLE V15.4.3555.308 This is a multi-part message in MIME format. ------=_NextPart_000_0025_01CD2BC5.1E699500 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable I took Paul Miller=92s suggestion and tested the windings on the 50A = Leach and the Lancair- supplied contactors.=20 I connected a 24V power supply to the coil terminals without any load = across the points and after 36 hours continuous the Leach case was = slightly warm to the touch. All of the terminals checked out- = electrically isolated from the case, low resistance across the points. The Lancair contactor was very different. Within about 15 minutes the = case was too hot to hold comfortably. The winding and contact terminals = grounded to the case in an apparently random fashion with changing = values of resistance and voltage. When the unit cooled down the = terminals were electrically isolated and coil resistance was as new so = the coil wasn=92t shorted internally and the unit seemed to be fine. As = power was reapplied and the coil began to warm the process repeated. I haven=92t heard of any problems on the LML so these contactors seem = to be adequate for the job. Oildyne says the pump is intermittent duty = (no percentage given) so it might be toasted before any problem with the = contactor showed up. OTOH the contactor is relatively heavy and seems = marginal- people using them might consider something different. =96Bill Wade ------=_NextPart_000_0025_01CD2BC5.1E699500 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
  I took Paul Miller=92s suggestion and tested the windings on = the 50A=20 Leach and the Lancair- supplied contactors.
 
  I connected a 24V power supply to the coil terminals without = any=20 load across the points and after 36 hours continuous the Leach case was = slightly=20 warm to the touch. All of the terminals checked out- electrically = isolated from=20 the case, low resistance across the points.
 
  The Lancair contactor was very different. Within about 15 = minutes=20 the case was too hot to hold comfortably. The winding and contact = terminals=20 grounded to the case in an apparently random fashion with changing = values of=20 resistance and voltage. When the unit cooled down the terminals were=20 electrically isolated and coil resistance was as new so the coil = wasn=92t shorted=20 internally and the unit seemed to be fine. As power was reapplied and = the coil=20 began to warm the process repeated.
 
  I haven=92t heard of any problems on the LML so these = contactors seem=20 to be adequate for the job. Oildyne says the pump is intermittent duty = (no=20 percentage given) so it might be toasted before any problem with the = contactor=20 showed up. OTOH the contactor is relatively heavy and seems marginal- = people=20 using them might consider something different.
    =96Bill Wade
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