X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao101.cox.net ([68.230.241.45] verified) by logan.com (CommuniGate Pro SMTP 5.3.0) with ESMTP id 4068292 for flyrotary@lancaironline.net; Thu, 07 Jan 2010 13:51:28 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.45; envelope-from=alventures@cox.net Received: from fed1rmimpo03.cox.net ([70.169.32.75]) by fed1rmmtao101.cox.net (InterMail vM.8.00.01.00 201-2244-105-20090324) with ESMTP id <20100107185053.MXDF4995.fed1rmmtao101.cox.net@fed1rmimpo03.cox.net> for ; Thu, 7 Jan 2010 13:50:53 -0500 Received: from BigAl ([72.192.128.205]) by fed1rmimpo03.cox.net with bizsmtp id Siqs1d0034S1t5C04iqs3w; Thu, 07 Jan 2010 13:50:52 -0500 X-VR-Score: -30.00 X-Authority-Analysis: v=1.1 cv=tFsbg6ins7CCNpnljIJNduQMDmn6okYQ4EWCOqLKcEg= c=1 sm=1 a=ALRuikges_4A:10 a=Vegc0WxVmH5BHtpNDyThtA==:17 a=Ia-xEzejAAAA:8 a=N8B9JuSIAAAA:8 a=7eTtGupitWt30GJH3esA:9 a=GDuneMvNJyHRLguiyxkA:7 a=MjzmNOJ_k72YpYhFdjl_7XE1bjwA:4 a=EzXvWhQp4_cA:10 a=JlEaPC1x4pJ5Eday:21 a=Fpg9XrbNLp0kgFTx:21 a=4Ri8SyI6kfZ3HnQjclAA:9 a=TMOQHWzJTTBHu6jvxTsA:7 a=rdNineO8S2SjLdJYLyqkyXQY8bYA:4 a=Luwjvm36sOAjB5zY:21 a=Cm3NVKu17-rWHjmm:21 a=Vegc0WxVmH5BHtpNDyThtA==:117 X-CM-Score: 0.00 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] High voltage problem fixed for real Date: Thu, 7 Jan 2010 10:52:05 -0800 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0009_01CA8F87.7396A590" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6856 In-Reply-To: Importance: Normal Thread-Index: AcqPvd1tR+vVTxrtTTK4HOzI1jgS2gACujQg X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_0009_01CA8F87.7396A590 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Dave; =20 Thank you for verifying what the problem was, and an easy solution. = I've also been seeing 14.5-15 volts at times, and it has been on my mind this week that I needed to address that. I had concluded it was likely caused = by voltage drop in the field circuit, but hadn't really considered it is = all the drops from the alt output, back to the battery, and back to the = field. =20 So to verify (for me and others who have done the internal disconnect = from output to voltage regulator/field supply); you connected from the = alternator output ('B' terminal) back to the field via a relay; where the relay = power has the over-voltage protection and panel switch.=20 =20 Now that you've done it seems obvious:-). =20 Al =20 -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of David Leonard Sent: Thursday, January 07, 2010 9:21 AM To: Rotary motors in aircraft Subject: [FlyRotary] High voltage problem fixed for real =20 I finally figured out why my voltage had been creeping up - I was losing = a small bit of voltage with each crimp and connection and section of wire = in the alternator field circuit (went from the main buss, through a fuse, = 4' to a switch, then 4' back to the alternator. That added up to 0.4 volts = over the length of the circuit when the field was drawing 3.5 amps. If that = draw ever goes up in flight the voltage drop would be higher. More = importantly there was a bad crimp in the b-field wire which would have been causing = an obvious drop in voltage between the alternator output and the rest of = the electrical system.=20 =20 I fixed the crimp and installed a relay near the alternator to handle = the field voltage. This not only got my operating voltage back down to 13.8 volts, but also removed the last bit of alternator noise from the = headsets. Cool! =20 Live and learn.=20 --=20 David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net http://RotaryRoster.net ------=_NextPart_000_0009_01CA8F87.7396A590 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Dave;

 

Thank you for verifying what the = problem was, and an easy solution.  I’ve also been seeing 14.5-15 = volts at times, and it has been on my mind this week that I needed to address = that. I had concluded it was likely caused by voltage drop in the field circuit, = but hadn’t really considered it is all the drops from the alt output, = back to the battery, and back to the field.

 

So to verify (for me and others = who have done the internal disconnect from output to voltage regulator/field = supply); you connected from the alternator output (‘B’ terminal) back to = the field via a relay; where the relay power has the over-voltage protection = and panel switch.

 

Now that you’ve done it = seems obviousJ.=

 

Al

 

-----Original = Message-----
From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of David Leonard
Sent: Thursday, January = 07, 2010 9:21 AM
To: Rotary motors in = aircraft
Subject: [FlyRotary] High = voltage problem fixed for real

 

I finally figured out why my voltage had been = creeping up - I was losing a small bit of voltage with each crimp and connection = and section of wire in the alternator field circuit (went from the main = buss, through a fuse, 4' to a switch, then 4' back to the alternator.  = That added up to 0.4 volts over the length of the circuit when the field was = drawing 3.5 amps.  If that draw ever goes up in flight the voltage drop = would be higher.  More importantly there was a bad = crimp in the b-field wire which would have been causing an obvious drop in voltage = between the alternator output and the rest of the electrical = system. 

 

I fixed the crimp and installed a relay = near the alternator to handle the field voltage.  This not only got my = operating voltage back down to 13.8 volts, but also removed the last bit of = alternator noise from the headsets. Cool!

 

Live and learn. 
--
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net http://RotaryRoster.net

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