REFLECTOR:Low volt warning

John Dibble reflector@tvbf.org
Mon, 06 Oct 2003 17:09:01 -0400


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I have a Rocky Mountain monitor.  Any electrical device that uses a lot
of current, like the hydraulic pump for the RG system, can lower the
voltage and trigger a low volt warning.  The monitor should have some
delay built in so it doesn't pick up brief periods of low voltage.  Do
you have a volt or amp reading to cross check with the low volt
warning?  The fuel pressure sender should have a small opening which
dampens the pressure fluctuations.  I have had problems with poor
grounds, but they cause high readings.

John

Rene Dugas wrote:

> Vision Microsystem.  Low volt warning for 2 to 3 seconds on most
> flights only once each flight  usually about 30 to 60 minutes into the
> flight.  Always recovers and never has occurred twice even in three
> hour flights.  Alternator belt snug and wires all tight.
>
> Low fuel pressure also does it occasionally but Lycoming and Visio say
> that is the flucuations in the mechanical fuel pump picked up by the
> vision system and is of no concern except when it warns one while
> flying a passenger such as a wife.  Between the rare low fuel light
> flickering, the low fuel warning for never more that 2 seconds and now
> the low volt warning once per flight( last one at night) I have
> decided to ask if others have experienced similar fleeting
> challenges.  By the way my headphones work fine.
>
> You can see my plane in Sport Aviation this month.  Thanks for all the
> help recommendations and laughs.
>
> Rene’ Dugas
>
> N129RD 140 hrs.
>

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I have a Rocky Mountain monitor.&nbsp; Any electrical device that uses
a lot of current, like the hydraulic pump for the RG system, can lower
the voltage and trigger a low volt warning.&nbsp; The monitor should have
some delay built in so it doesn't pick up brief periods of low voltage.&nbsp;
Do you have a volt or amp reading to cross check with the low volt warning?&nbsp;
The fuel pressure sender should have a small opening which dampens the
pressure fluctuations.&nbsp; I have had problems with poor grounds, but
they cause high readings.
<p>John
<p>Rene Dugas wrote:
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<div class=Section1>
<div class="MsoNormal"><span 
style='font-size:12.0pt'><font face="Trebuchet MS"><font color="#663333"><font size=+0>Vision
Microsystem.&nbsp; Low volt warning for 2 to 3 seconds on most flights
only once each flight&nbsp; usually about 30 to 60 minutes into the flight.&nbsp;
Always recovers and never has occurred twice even in three hour flights.&nbsp;
Alternator belt snug and wires all tight.&nbsp;</font></font></font></span></div>


<p class="MsoNormal"><span 
style='font-size:12.0pt'><font face="Trebuchet MS"><font color="#663333"><font size=+0>Low
fuel pressure also does it occasionally but Lycoming and Visio say that
is the flucuations in the mechanical fuel pump picked up by the vision
system and is of no concern except when it warns one while flying a passenger
such as a wife.&nbsp; Between the rare low fuel light flickering, the low
fuel warning for never more that 2 seconds and now the low volt warning
once per flight( last one at night) I have decided to ask if others have
experienced similar fleeting challenges.&nbsp; By the way my headphones
work fine.</font></font></font></span>

<p class="MsoNormal"><span 
style='font-size:12.0pt'><font face="Trebuchet MS"><font color="#663333"><font size=+0>You
can see my plane in Sport Aviation this month.&nbsp; Thanks for all the
help recommendations and laughs.</font></font></font></span>

<p class="MsoNormal"><span 
style='font-size:12.0pt'><font face="Trebuchet MS"><font color="#663333"><font size=+0>Rene’
Dugas</font></font></font></span>

<p class="MsoNormal"><span 
style='font-size:12.0pt'><font face="Trebuchet MS"><font color="#663333"><font size=+0>N129RD
140 hrs.</font></font></font></span></div>
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