X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 07 Mar 2012 14:55:35 -0500 Message-ID: X-Original-Return-Path: Received: from nm23.bullet.mail.sp2.yahoo.com ([98.139.91.93] verified) by logan.com (CommuniGate Pro SMTP 5.4.4) with SMTP id 5432391 for lml@lancaironline.net; Wed, 07 Mar 2012 13:05:27 -0500 Received-SPF: none receiver=logan.com; client-ip=98.139.91.93; envelope-from=pbricker@att.net Received: from [72.30.22.77] by nm23.bullet.mail.sp2.yahoo.com with NNFMP; 07 Mar 2012 18:04:52 -0000 Received: from [209.191.108.97] by tm11.bullet.mail.sp2.yahoo.com with NNFMP; 07 Mar 2012 18:03:52 -0000 Received: from [66.94.237.110] by t4.bullet.mud.yahoo.com with NNFMP; 07 Mar 2012 18:03:52 -0000 Received: from [127.0.0.1] by omp1015.access.mail.mud.yahoo.com with NNFMP; 07 Mar 2012 18:03:52 -0000 X-Yahoo-Newman-Id: 354124.69015.bm@omp1015.access.mail.mud.yahoo.com Received: (qmail 40715 invoked from network); 7 Mar 2012 18:03:51 -0000 X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: DGz_Pj0VM1l1j.bFcLhjPqUSGLaiSbOUTwqQoh_Gg0Oq_Hb yOg7JTZcc3m_5MM8rm6pRETxGJpdwJT9PcvS26jXJl73rGPxQyEfhxHGxHMd LP386OoiJTSBJofi_cfUwDcLVhgV4GOn8NjdnbDAqauHLE.REm0DIJ6pyiJG juM.LRZpbQE32j_QxpGYgmxwu5SSYr62LOfPbjTilr337JT1rOK94SGRzWKI XS38uFOiM3hKU0ZxeELlkhhvmuxHIavgnENmpX9LwRqwOeD.KiDC3CVg.UdX 4ICB.Ifw9MXNjxJzLFLllhAgAit.sy8f8_eg8LG2Jr0a3kSVx.TouoHrTad9 LEsfLQQWAFJNCEgPsthcZ4optb9ih4uiC1U451dDojhzFMYn9pEiYxgzxAPE lgk2snd3JJvsbwb4m1gbadU4yeCgS37gzWF0- X-Yahoo-SMTP: E_DOnNaswBA_C3UUkqdGieqw9axmS6GTFECYQXU- Received: from [192.168.1.69] (pbricker@76.206.248.200 with login) by smtp110.sbc.mail.ne1.yahoo.com with SMTP; 07 Mar 2012 10:03:51 -0800 PST User-Agent: Microsoft-MacOutlook/14.14.0.111121 X-Original-Date: Wed, 07 Mar 2012 10:03:37 -0800 Subject: Re: [LML] Re: Field breakers popping From: Paul Bricker X-Original-To: Lancair Mailing List X-Original-Message-ID: Thread-Topic: [LML] Re: Field breakers popping In-Reply-To: Mime-version: 1.0 Content-type: multipart/alternative; boundary="B_3413959431_54678393" > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3413959431_54678393 Content-type: text/plain; charset="US-ASCII" Content-transfer-encoding: 7bit Guys, I had a problem tripping field breakers on my ES with the IO-550N. After troubleshooting the regulator and checking all the connections, and spoke to a gentleman at B&C (I've forgotten his name). He related that the problem is often the design of the engine mounted alternator. It is a modified automotive design that doesn't do well in the AC vibration environment, and the field wiring often shorts due to the vibration causing the insulating varnish on the wire to wear through and the field to short to the armature. He recommended have the alternator overhauled by an aircraft electrical shop in the Chicago area (I don't remember the name-great help huh) that he recommended their work. Not exactly Craig's problem as this only apples to the Main alternator. As a possible work around he recommended reversing the field connections at the alternator. If the short is at one end of the windings it will still have a majority of the field resistance still in the circuit. I did this and by some miracle the problem went away. Not very elegant but it saved the cost of an overhaul and weeks of downtime. Paul Bricker From: "F. Barry Knotts" Reply-To: Lancair Mailing List Date: Wed, 07 Mar 2012 07:58:53 -0500 To: Subject: [LML] Re: Field breakers popping Had similar issues with just the backup alternator system. I put a recording voltmeter on the circuit to try to diagnose. Found voltage spikes that tripped the regulator. Changed alternators, batteries, a lot of wiring and B&C regulators before I found the very slightly loose ground connection on the firewall. Hasn't been a problem since. Would recommend a thorough check of all ground connections on engine, alternators, batteries and into airframe before replacing other "parts." I am convinced that your problem is with a ground as that's probably the only common connection between the two charging systems. Barry Knotts L-IV P, N4XE On 3/5/2012 8:21 AM, Craig Gainza wrote: > > Dear Listers, > > Recently, I completed my annual and test flew the airplane. Upon lifting the > gear both primary and secondary alternator field breakers popped. Pushed them > back in and all charging returned to normal on the primary and secondary > alternators. > > Landed, checked connections, put in a different battery, ran through B and C > voltage regulator troubleshooting guide (came out normal) and did a ground > run up. When lifting the flaps, hydraulic pump kicked on both field breakers > popped again. Right now I am assuming it is the voltage regulator (both pri > and sec are B and C), alternator , or a connector. > > Anyone have similar issues and can recommend the next course of action? > > Thank you, > > Craig Gainza > IV-P TSIOF 550 > 782 hours and holding > > > > > --B_3413959431_54678393 Content-type: text/html; charset="US-ASCII" Content-transfer-encoding: quoted-printable
Guys,

I had a problem tripping field breakers on my ES with the IO-550N. After tr= oubleshooting the regulator and checking all the connections, and spoke to a= gentleman at B&C (I've forgotten his name). He related that the problem= is often the design of the engine mounted alternator. It is a modified auto= motive design that doesn't do well in the AC vibration environment, and the = field wiring often shorts due to the vibration causing the insulating varnis= h on the wire to wear through and the field to short to the armature. He rec= ommended have the alternator overhauled by an aircraft electrical shop in th= e Chicago area (I don't remember the name-great help huh) that he recommende= d their work. Not exactly Craig's problem as this only apples to the Main al= ternator.

As a possible work around he recommended = reversing the field connections at the alternator. If the short is at one en= d of the windings it will still have a majority of the field resistance stil= l in the circuit. I did this and by some miracle the problem went away. Not = very elegant but it saved the cost of an overhaul and weeks of downtime.

Paul Bricker

From: "F. Barry Knotts" <bknotts@buckeye-express.com>
Reply-To: Lancair Mailing List <lml@lancaironline.net>
= Date: Wed, 07 Mar 2012 07:58:53 -0500
To: <lml@lancaironline= .net>
Subject: [LML] Re: Fi= eld breakers popping

Had similar issues with just the backup alternator system.  I put = a recording voltmeter on the circuit to try to diagnose.  Found voltage spikes that tripped the regulator.  Changed alternators, batteries, a lot of wiring and B&C regulators before I found the very slightly loose ground connection on the firewall. Hasn't been a problem since.  Would recommend a thorough check of all ground connections on engine, alternators, batteries and into airframe before replacing other "parts."  I am convinced that your problem = is with a ground as that's probably the only common connection between the two charging systems.

Barry Knotts
L-IV P, N4XE

On 3/5/2012 8:21 AM, Craig Gainza wrote:
Dear Listers,

Recently, I completed my annual and test flew the airplane.  Upon lifting the gear both primary and secondary alternator field breakers popped.  Pushed them back in and all charging returned to normal on the primary and secondary alternators.  =

Landed, checked connections, put in a different battery, ran through B and C voltage regulator troubleshooting guide (came out normal)  and did a ground run up.  When lifting the f= laps, hydraulic pump kicked on both field breakers popped again.  Right now I am assuming it is the voltage regulator (both pri and sec are B and C), alternator , or a connector.

Anyone have similar issues and can recommend the next course of action?

Thank you,

Craig Gainza
IV-P TSIOF 550
 782 hours and holding




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