X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 28 Oct 2011 10:11:50 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-kukur.atl.sa.earthlink.net ([209.86.89.65] verified) by logan.com (CommuniGate Pro SMTP 5.4.2) with ESMTP id 5176065 for lml@lancaironline.net; Fri, 28 Oct 2011 09:41:39 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.65; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=G0wBph6FbKB/xgHNdAFuIxFtMKsEI9gOCCIKYbqb/bcxlLNpFPRNgVA4rw/761X0; h=Received:From:Mime-Version:Content-Type:Subject:Date:In-Reply-To:To:References:Message-Id:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [64.223.218.240] (helo=[192.168.1.25]) by elasmtp-kukur.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1RJmgB-0008VM-7D for lml@lancaironline.net; Fri, 28 Oct 2011 09:41:03 -0400 From: Colyn Case Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: multipart/alternative; boundary=Apple-Mail-280-52162664 Subject: Re: [LML] Re: Problem with Fluctuating Amperage X-Original-Date: Fri, 28 Oct 2011 09:41:02 -0400 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <04D5A445-2ABC-4E80-AB0F-711523C98DB8@earthlink.net> X-Mailer: Apple Mail (2.1084) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da9403739a6040b47fc833087f4b9effb55ce350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 64.223.218.240 --Apple-Mail-280-52162664 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 Craig, are you using a hall effect sensor? Maybe you could go back to = a shunt and eliminate the noise sensitivity. On Oct 28, 2011, at 8:04 AM, Craig Schulze wrote: I have the exact same problem with my Lancair. The amps reading will be = steady and then spike negative. The amount will vary. It is caused by = electrical noise created by one of my electronic ignitions. I have = replaced everything except the ignition system. I have tried relocating = the amp probe and even replaced the probe. Turn off that ignition and = the problem stops. I have verified that the amps are not changing by = using an analog meter. Its just electrical noise. My next try will be = to RF choke the leads going to the EIS.=20 =20 Craig Schulze Lancair 320 =20 From: Taylor, David [mailto:dtaylor@crescentpark.com]=20 Sent: Wednesday, October 26, 2011 3:21 AM To: lml@lancaironline.net Subject: RE: [LML] Re: Problem with Fluctuating Amperage =20 Charley, The voltage holds steady. But yes some of the other readings = gyrate around slowly and then recover with the amp reading after 30 = seconds. I only have one alternator, battery etc =96 very simple = system and plane! =20 From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of = Charley Brown Sent: 10-25-11-Tue 21:01 To: lml@lancaironline.net Subject: [LML] Re: Problem with Fluctuating Amperage =20 The voltage almost HAS to be fluctuating wildly if the ammeter reading = is anywhere near right -- which raises the question, why is it only the = fuel readings that are affected? With those amps, the whole system = should be flashing on/off... If this is the amperage for the primary = alternator... is there a backup alternator involved? Oscillations = between primary and backup can be significant if they both regulate to a = similar voltage. =20 Charley Brown Legacy 28V dual alt single batt g900x =20 =20 On Oct 25, 2011, at 1:01 PM, Dennis Johnson wrote: =20 Hi David, =20 What is the voltage reading during this time? Does the Grand Rapids = EFIS Sport record data that you can download and study after a flight?=20= =20 Dennis Legacy 450 hours ----- Original Message ----- From:=20 To: lml@lancaironline.net Sent: Tuesday, October 25, 2011 4:50 AM Subject: [LML] Problem with Fluctuating Amperage =20 Any ideas about what would cause my amperage to start fluctuating wildly = about 5 minutes into a flight?=20 It starts out fine after takeoff at 15 amps and then goes to -50 amps = for 30 seconds, and then gyrates between 5 amps and -50 amps for a = minute and then goes back to normal. It repeats this sequence every 5 = minutes.=20 My fuel gages also go down to zero during this episode and then back to = normal. Is my B&C LR3C Linear Regulator going bad?=20 (I'm getting these readings from my Grand Rapids EIS engine monitor. = It's hooked up to a Grand Rapids EFIS Sport.) Thanks for the help! David T. Legacy RG =20 =20 --Apple-Mail-280-52162664 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252 Craig, are you using a hall effect sensor?   =  Maybe you could go back to a shunt and eliminate the noise = sensitivity.

On Oct 28, 2011, at 8:04 AM, Craig = Schulze wrote:

I = have the exact same problem with my Lancair.  The amps reading will = be steady and then spike negative.  The amount will vary.  It = is caused by electrical noise created by one of my electronic = ignitions.  I have replaced everything except the ignition = system.  I have tried relocating the amp probe and even replaced = the probe.  Turn off that ignition and the problem stops.  I = have verified that the amps are not changing by using an analog = meter.  Its just electrical noise.  My next try will be to RF = choke the leads going to the EIS. 
Craig = Schulze
From: Taylor, David = [mailto:dtaylor@crescentpark.com] 
Sent: Wednesday, October 26, 2011 = 3:21 AM
To: lml@lancaironline.net
Subj= ect: RE: [LML] Re: = Problem with Fluctuating = Amperage
From: Lancair Mailing List = [mailto:lml@lancaironline.net] On Behalf Of Charley = Brown
Sent: 10-25-11-Tue = 21:01
To: lml@lancaironline.net
Subj= ect: [LML] Re: = Problem with Fluctuating = Amperage
The voltage almost HAS to = be fluctuating wildly if the ammeter reading is anywhere near right -- = which raises the question, why is it only the fuel readings that are = affected?  With those amps, the whole system should be flashing = on/off...  If this is the amperage for the primary alternator... =  is there a backup alternator involved?  Oscillations between = primary and backup can be significant if they both regulate to a similar = voltage.
Charley = Brown
Legacy  28V =  dual alt single batt g900x
 
On Oct 25, 2011, at 1:01 = PM, Dennis Johnson wrote:

Hi = David,

What = is the voltage reading during this time?  Does the Grand Rapids = EFIS Sport record data that you can download and study after a = flight? 
Legacy = 450 hours
----- Original Message = -----
Sent:Tuesday, October 25, 2011 4:50 = AM
[LML] Problem with Fluctuating = Amperage
Any ideas = about what would cause my amperage to start fluctuating wildly about 5 = minutes into a flight? 

It starts out fine = after takeoff at 15 amps and then goes to -50 amps for 30 seconds, and = then gyrates between 5 amps and -50 amps for a minute and then goes back = to normal. It repeats this sequence every 5 minutes. 

My fuel gages also = go down to zero during this episode and then back to normal.

Is = my B&C LR3C Linear Regulator going bad? 

(I'm getting these = readings from my Grand Rapids EIS engine monitor. It's hooked up to a = Grand Rapids EFIS Sport.)

Thanks for the help!

David = T.
Legacy RG
 
 

= --Apple-Mail-280-52162664--