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Message-ID: <5cf132c0708061341s2e07a2cdh39fdfb3ec963aa00@mail.gmail.com>
Date: Mon, 6 Aug 2007 15:41:31 -0500
From: "Mark Steitle" <msteitle@gmail.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Alternator drawing current at rest.
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Or use an OFF-ON-ON switch as recommended by the Aero-Electric list.  First
"ON" closes the battery contactor, the second "ON" activates the alternator
field.

Mark S.


On 8/6/07, Al Gietzen <ALVentures@cox.net> wrote:
>
>  *Subject:* [FlyRotary] Re: Alternator drawing current at rest.
>
>
>
> Yep, that was the problem.  I had it wired so that the field windings were
> active whenever there was power to the system.  I did that to cut down on
> audio noise, but have decided to bring the field lead back into the cabin so
> I can control it.  Will add a filter and live with the remaining noise.
>
>
>
> Dave Leonard
>
>
>
> Dave;
>
>
>
> I don't think the field current is a noise issue; it's the output that can
> be noisy.  I think you'd like to have the field supply come to a breaker on
> the panel, with a 'crowbar' over voltage protection.  I used a 7.5Apullable breaker, so on a occasion where I might be sitting with the engine
> off,  and the power on for extended duration for some reason (like figuring
> out how to program the flight plan into the GPS), I can pull the breaker to
> reduce the battery draw.
>
>
>
> Al
>
>
>
>
>
> On 8/5/07, *Al Gietzen* <ALVentures@cox.net> wrote:
>
> *Subject:* [FlyRotary] Alternator drawing current at rest.
>
>
>
> That current draw for the coils did seem high, so I checked further into
> it.  Turns out it is the alternator drawing the 3 amps, not the coils.  It
> gets warm to the touch.  Is that normal?
>
>
>
> Dave Leonard
>
> Sounds about right.  I measured the field winding draw at about 2.5 A,
> engine off.
>
>
>
> Al
>
>
>
>
>
>
> --
> David Leonard
>
> Turbo Rotary RV-6 N4VY
> http://N4VY.RotaryRoster.net <http://n4vy.rotaryroster.net/>
> http://RotaryRoster.net <http://rotaryroster.net/>
>

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<div>Or use an OFF-ON-ON switch as recommended by the Aero-Electric list.&nbsp; First &quot;ON&quot; closes the battery contactor, the second &quot;ON&quot; activates the alternator field.&nbsp;</div>
<div>&nbsp;</div>
<div>Mark S.<br><br>&nbsp;</div>
<div><span class="gmail_quote">On 8/6/07, <b class="gmail_sendername">Al Gietzen</b> &lt;<a href="mailto:ALVentures@cox.net">ALVentures@cox.net</a>&gt; wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div lang="EN-US" vlink="blue" link="blue">
<div>
<p style="MARGIN-LEFT: 0.5in"><b><font face="Tahoma" size="2"><span style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">Subject:</span></font></b><font face="Tahoma" size="2"><span style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">
 [FlyRotary] Re: Alternator drawing current at rest.</span></font></p>
<p style="MARGIN-LEFT: 0.5in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">&nbsp;</span></font></p>
<div>
<p style="MARGIN-LEFT: 0.5in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">Yep, that was the problem.&nbsp; I had it wired so that the field windings were active whenever there was power to the system.&nbsp;&nbsp;I did that to cut down on audio noise, but have decided to bring the field lead back into the cabin so I can control it.&nbsp; Will add a filter and live with the remaining noise. 
</span></font></p></div>
<div>
<p style="MARGIN-LEFT: 0.5in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">&nbsp;</span></font></p></div>
<div>
<p style="MARGIN-LEFT: 0.5in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">Dave</span></font> Leonard</p>
<p><font face="Verdana" color="blue" size="2"><span style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">&nbsp;</span></font></p>
<p><font face="Verdana" color="blue" size="2"><span style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">Dave</span></font><font face="Verdana" color="blue" size="2"><span style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">
;</span></font></p>
<p><font face="Verdana" color="blue" size="2"><span style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">&nbsp;</span></font></p>
<p><font face="Verdana" color="blue" size="2"><span style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">I don't think the field current is a noise issue; it's the output that can be noisy. &nbsp;I think you'd like to have the field supply come to a breaker on the panel, with a 'crowbar' over voltage protection.&nbsp; I used a 
7.5A pullable breaker, so on a occasion where I might be sitting with the engine off,&nbsp; and the power on for extended duration for some reason (like figuring out how to program the flight plan into the GPS), I can pull the breaker to reduce the battery draw.
</span></font></p>
<p><font face="Verdana" color="blue" size="2"><span style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">&nbsp;</span></font></p>
<p><font face="Verdana" color="blue" size="2"><span style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">Al</span></font></p>
<p style="MARGIN-LEFT: 0.5in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt"><br><br>&nbsp;</span></font></p></div>
<div>
<p style="MARGIN-LEFT: 0.5in"><span><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">On </span></font></span><span>8/5/07</span><span>, <b><span style="FONT-WEIGHT: bold">Al Gietzen</span></b> &lt;<a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:ALVentures@cox.net" target="_blank">
ALVentures@cox.net</a>&gt; wrote:</span> </p>
<div vlink="blue" link="blue">
<div>
<p style="MARGIN-LEFT: 1in"><b><font face="Tahoma" size="2"><span style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">Subject:</span></font></b><font face="Tahoma" size="2"><span style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">
 [FlyRotary] Alternator drawing current at rest.</span></font></p>
<p style="MARGIN-LEFT: 1in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">&nbsp;</span></font></p>
<div>
<p style="MARGIN-LEFT: 1in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">That current draw for the coils did seem high, so I checked further into it.&nbsp; Turns out it is the alternator drawing the 3 amps, not the coils.&nbsp; It gets warm to the touch.&nbsp; Is that normal? 
</span></font></p></div>
<div>
<p style="MARGIN-LEFT: 1in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">&nbsp;</span></font></p></div>
<div>
<p style="MARGIN-LEFT: 1in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">Dave Leonard</span></font></p>
<p style="MARGIN-LEFT: 0.5in"><font face="Verdana" color="blue" size="2"><span style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">Sounds about right.&nbsp; I measured the field winding draw at about 2.5 A, engine off.
</span></font></p>
<p style="MARGIN-LEFT: 0.5in"><font face="Verdana" color="blue" size="2"><span style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">&nbsp;</span></font></p>
<p style="MARGIN-LEFT: 0.5in"><font face="Verdana" color="blue" size="2"><span style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">Al</span></font></p>
<p style="MARGIN-LEFT: 1in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt">&nbsp;</span></font></p></div></div></div></div>
<p style="MARGIN-LEFT: 0.5in"><font face="Times New Roman" size="3"><span style="FONT-SIZE: 12pt"><br><br clear="all"><br>-- <br>David Leonard<br><br>Turbo Rotary RV-6 N4VY <br><a onclick="return top.js.OpenExtLink(window,event,this)" href="http://n4vy.rotaryroster.net/" target="_blank">
http://N4VY.RotaryRoster.net</a><br><a onclick="return top.js.OpenExtLink(window,event,this)" href="http://rotaryroster.net/" target="_blank">http://RotaryRoster.net</a> </span></font></p></div></div></blockquote></div><br>

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