X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 08 Jan 2010 14:09:11 -0500 Message-ID: X-Original-Return-Path: Received: from smtp108.sbc.mail.gq1.yahoo.com ([67.195.14.111] verified) by logan.com (CommuniGate Pro SMTP 5.3.0) with SMTP id 4068428 for lml@lancaironline.net; Thu, 07 Jan 2010 15:04:49 -0500 Received-SPF: none receiver=logan.com; client-ip=67.195.14.111; envelope-from=pbricker@att.net Received: (qmail 80489 invoked from network); 7 Jan 2010 20:04:11 -0000 Received: from 76-206-248-200.lightspeed.irvnca.sbcglobal.net (pbricker@76.206.248.200 with login) by smtp108.sbc.mail.gq1.yahoo.com with SMTP; 07 Jan 2010 12:04:11 -0800 PST X-Yahoo-SMTP: E_DOnNaswBA_C3UUkqdGieqw9axmS6GTFECYQXU- X-YMail-OSG: S5DeaZ0VM1kyXDR_iTlWqbyK8X1abgzMmuhLHt_pvRqH8dcSVTIGL4fmLNdWxamviXYWNgnzdFIermupAbWvMMQwsltpn_LK5PiSAzG_0awSaPnbV.V7GFHsiUk1DT3.4_UB6bF6o.0IpVAllCW0XYF6hjr9.jk6lnbAAcDd0HxIbEYQPtuR.UbYlCV3InWGwbJh9Qn1lKU6R0QYQBBEog9qcyTYECILHvdYWA6g6tahaYk3mc1kX2YexCRR1SvEDD.qDLCrE.1Kl9dnVhWTdA.HyT1A9b72C2I.hYbcxQ-- X-Yahoo-Newman-Property: ymail-3 From: "Paul Bricker" X-Original-To: "'Lancair Mailing List'" References: Subject: RE: [LML] Charging System Problem X-Original-Date: Thu, 7 Jan 2010 12:04:10 -0800 X-Original-Message-ID: <84EACD2B727E43779BFF7F42D4E51481@paulrzm5oth3zt> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0196_01CA8F91.85DD4060" X-Mailer: Microsoft Office Outlook 11 In-Reply-To: Thread-Index: AcqNu4Ci+x83uRzYSaSTZZvr21GsBwCF1CeQ X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_0196_01CA8F91.85DD4060 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Craig, Similar to a problem I had with my ES, ie., the 5 amp field breaker would pop almost every flight. I have a 60 amp, 24 volt alternator and the B&C LR3C-28 regulator . I checked the batteries, all the connections (control, ground and hot) and replaced the breaker. No joy. Consulting with a person very familiar with the charging an electrical systems on aircraft I learned that the engine driven alternators on Cont engines have a tendency to develop intermittant shorts in the windings. There are two fixes. One, replace the alternator or at least the rotor (expensive). Second, if the short is toward one end of the windings, swapping the field connections on the alternator might make the problem go away. Presumably having sufficient wingings in line before the short prevents the field current from spiking high enough to pop the breaker. I was lucky and this appears to have fixed my problem. No trips after ~ 40 hours, while before I would get one every 30 mins to 2 hours. Lots of luck. Paul Bricker N63PB _____ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Craig Berland Sent: Monday, January 04, 2010 7:59 PM To: lml@lancaironline.net Subject: [LML] Charging System Problem My IV-P has a charging problem. The alternator 5 amp field circuit breaker pops. It seems to take longer to pop when there is a higher electrical load. For example when the air conditioner is running. I have a 24v system, 100 amp alternator, B&C voltage regulator and two 12 v gel cell batteries in series. Any thoughts as to where I should look? Craig Berland N7VG ------=_NextPart_000_0196_01CA8F91.85DD4060 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Craig,

Similar to a problem I had with my = ES, ie., the 5 amp field breaker would pop almost every flight. I have a 60 = amp, 24 volt alternator and the B&C LR3C-28 regulator . I checked the = batteries, all the connections (control, ground and hot) and replaced the breaker. = No joy. Consulting with a person very familiar with the charging an electrical = systems on aircraft I learned that the engine driven alternators on Cont engines = have a tendency to develop intermittant shorts in the windings. There are two = fixes. One, replace the alternator or at least the rotor (expensive). Second, = if the short is toward one end of the windings, swapping the field connections = on the alternator might make the problem go away. Presumably having sufficient wingings in = line before the short prevents the field current from spiking high enough to = pop the breaker. I was lucky and this appears to have fixed my problem. No trips = after ~ 40 hours, while before I would get one every 30 mins to 2 = hours.

Lots of = luck.

Paul = Bricker

N63PB

 

From: = Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Craig Berland
Sent: Monday, January 04, = 2010 7:59 PM
To: = lml@lancaironline.net
Subject: [LML] Charging = System Problem

 

My IV-P has a charging problem.  The alternator 5 amp field circuit = breaker pops.  It seems to take longer to pop when there is a higher = electrical load.  For example when the air conditioner is running.  I = have a 24v system, 100 amp alternator, B&C voltage regulator and  two 12 v = gel cell batteries in series.  Any thoughts as to where I should = look?

 

Craig Berland

N7VG

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