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s64woody(at)aol.com
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 Posted: Sun Jun 19, 2016 7:58 am Post subject: Opinions on options |
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Architecture: Twin battery,alternator and buss system with an electrically dependent fuel system. Basically, two complete systems with a emergency cross-tie relay. There are three fuse blocks, one of which I can power via diodes from each system.
Question: Opinions wanted on FEMA between just powering each boost pump system off of one of the alternators or using a dedicated, diode powered fuse block as an essential buss. I can see simplicity in the first option. The second has some elegance, but there is something of a single point failure there, as well.
Scott
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nuckolls.bob(at)aeroelect
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| Posted: Sun Jun 19, 2016 9:28 am Post subject: Opinions on options |
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From: s64woody(at)aol.com
To: aeroelectric-list(at)matronics.com
Subject: Opinions on options
Architecture: Twin battery,alternator and buss system with
an electrically dependent fuel system. Basically, two complete
systems with a emergency cross-tie relay. There are three
fuse blocks, one of which I can power via diodes from each system.
Question: Opinions wanted on FEMA between just powering each
boost pump system off of one of the alternators or using a
dedicated, diode powered fuse block as an essential buss. I
can see simplicity in the first option. The second has some
elegance, but there is something of a single point failure there, as well.
That may be much more electrical system than
is necessary . . . but if you're already committed,
run each pump from separate battery busses.
Likelihood of loosing both busses during expenditure
of one tank of fuel is vanishingly small.
If any part of your engine support is electrically
driven, run those items directly from battery
busses as well.
If you have bad smells in the cockpit, you want
to make the entire electrical system "cold" without
affecting engine operation.
Bob . . .
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