nuckolls.bob(at)aeroelect
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 Posted: Thu Sep 03, 2009 7:54 am Post subject: What single failure of installed equipment prompts me to c |
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| Quote: | | 1. In August, on the way out of Puget Sound in IFR soup to VFR conditions east of the Cascades, I had no problems with my dual Cheltons. On the way back a week later in VFR conditions, I had a brownout of the Cheltons (first and only time in 235 hours). They began to reset in seconds, but took the usual two minutes to boot-up. I don't have a clue as to why the brownout. |
If you have Z-12 installed, then there is no 'good'
reason for a brownout. If the main alternator had
sagged, the standby alternator should have picked
up as much load as it could shoulder and the
"ALTERNATOR LOADED" light should have flashed at
you. If BOTH alternators had crapped, then the low
voltage warning light should have come on and your
WELL MAINTAINED RG battery should have picked up the
load thus preventing a brown out.
| Quote: | | Any and all suggestions are greatly appreciated--I'm here to learn! |
You need to identify the reason for the brown-out you
experienced. Adding in more "stuff" to craft dual
electrical systems may well avoid duplicating the
problem in the second system . . . but the first
problem may be lurking in the first.
What you've described is mystifying and does not
make sense in the context of the mini-FMEA we
went through above. The system you have is
exceedingly robust. A demonstrated lack of robustness
is an design/installation/maintenance issue, not a
lack of equipment.
As an interim prophylactic against an unhappy
event, power one of the Cheltons from your battery
bus. If it doesn't have a built in power switch,
hang a temporary switch under the panel on a bracket
or some such band-aid.
There's something seriously amiss with what you
presently have installed. If the brown-out was so
short in duration that you didn't notice any
warning lights, then loose connections come
to mind. Also, one of your Cheltons should be
on an E-bus and the other on the main bus. This
would automatically give you the "trouble shooting"
fix by flying with the e-bus alternate feed switch
ON.
Bob . . .
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( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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[quote][b]
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