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Intermittent power supply issue

 
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l.p(at)talk21.com
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PostPosted: Tue May 07, 2013 12:42 pm    Post subject: Intermittent power supply issue Reply with quote

I have a Long-EZ with the Z13 11/01 architecture.
It has been running fine for 5 years but now an intermittent power supply issue has arisen.
The Garmin 530 and GTX 330 run off the endurance bus and have been going offline recently: the transponder more frequently but the 530 nav/com/gps has the "power off" screen come up and then power seems to reestablish itself and then all is fine with the radio for a while.
The VMS1000 engine instrumentation display also comes off this bus and the volt sense has recently been showing 12.7 to 13.7 volts.
Bypassing the bridge rectifier now has the voltage showing 15.1 to 15.4 volts and then flashes the volts display.
I am about to go through the LR3C troubleshooting guide, but wondered if anyone has any bright ideas as to what may be occurring?
Patrick Elliott, England. G-LGEZ.

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nuckolls.bob(at)aeroelect
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PostPosted: Wed May 08, 2013 6:06 am    Post subject: Intermittent power supply issue Reply with quote

At 03:41 PM 5/7/2013, you wrote:
Quote:
I have a Long-EZ with the Z13 11/01 architecture.
It has been running fine for 5 years but now an intermittent power
supply issue has arisen.
The Garmin 530 and GTX 330 run off the endurance bus and have been
going offline recently: the transponder more frequently but the 530
nav/com/gps has the "power off" screen come up and then power seems
to reestablish itself and then all is fine with the radio for a while.
The VMS1000 engine instrumentation display also comes off this bus
and the volt sense has recently been showing 12.7 to 13.7 volts.
Bypassing the bridge rectifier now has the voltage showing 15.1 to
15.4 volts and then flashes the volts display.
I am about to go through the LR3C troubleshooting guide, but
wondered if anyone has any bright ideas as to what may be occurring?
Patrick Elliott, England. G-LGEZ.

First, a reading over 14.6 on the system is TOO HIGH.
Adjust the LR-3 regulator DOWN until a normal main bus
voltage of 14.6 is achieved.

A bridge rectifier doesn't go 'intermittent' . . . further,
closing the alternate feed switch is equivalent to bypassing
the rectifier. After re-adjustment of the regulator, see
if the intermittent condition goes away with the alternate
feedpath switch closed. You're looking for a lose connection
of some variety . . . but fix that voltage first.

Bob . . .


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user9253



Joined: 28 Mar 2008
Posts: 1929
Location: Riley TWP Michigan

PostPosted: Wed May 08, 2013 9:44 am    Post subject: Re: Intermittent power supply issue Reply with quote

9 times out of 10, electrical problems are caused by bad connections. I suggest taking apart every connection in the circuit, making sure the mating surfaces are clean, tugging on crimped terminals, and then reassembling everything. Depending on the circuit, a bad connection(s) to the voltage regulator sense terminal can cause high voltage or voltage fluctuations.
When problems are intermittent, a bad connection is the first suspect.
Joe


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