nuckolls.bob(at)aeroelect
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 Posted: Tue Jun 24, 2014 4:44 am Post subject: Z-14 Schematic |
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At 11:34 PM 6/23/2014, you wrote:
I am using your Schematic Z-14 as my guide for the power circuits in
my Seawind project. There are some wire size callouts that confuse me.
You show 4awg thru the starter circuit up to the starter contactor,
for both main and aux. batteries, but 2awg from there to the starter.
You also show 2awg for the link between cross-feed contactor and main
battery contactor. Seems like the same current should demand the same
wire throughout.
The Z-figures are ARCHITCTURE drawings, not wiring diagrams.
EVERY wire used in the final configuration should be evaluated
for suitability to task which includes consideration mostly
for voltage drop. 2AWG (or larger) is probably necessary
for voltage drop considerations on your long leads. But
4AWG can be used for short run jumpers and especially to
battery terminal posts.
Batteries have to be in the nose for weight & balance & because
there's no other suitable space. It's 25ft from batteries to
starter. Seawind specified 2awg. I bumped it up to 1awg welding
cable, cause I get more copper for the buck, and want all the starter
power available. (No way in hell it can be hand propped.)
In other words, if 4AWG will work for the same engine
and battery combo in an RV, then the wire isn't in
trouble for overheating in a seaplane . . . the long
wire runs dictate more copper to keep the cranking
performance up.
There is no usable firewall space, so the contactors are up front
with the batteries.
Not sure what you mean here. Battery contactors mount
as close as practical to batteries, starter contactor
as close as practical to starter.
Regulators go there too-only one field wire each need go back.
Why is 4awg called out for main alt. "B" to starter contactor?
If run to a 50A breaker in the panel
Please no b-lead breakers on panel . . . use current limiter
or fat-fuse at the contacotrs). Size the wire as your
voltage drops dictate. Z-14 in a seaplane brings b-leads
up front on long wires. Starter contactor should be close
to starter and main alternator b-lead tied into system
AT the hot side of the contactor . . . use that starter
current fat-wire to service the alternator too.,
6awg should be enough? (Regulator reads voltage at the other end?)
. . . long wire, legacy practices call for limiting
voltage drop to a few percent at full alternator
load.
What does * = 6 inches or less mean?
Means the two devices should be as close to each
other as practical.
What is "Note 10"--I couldn't find it in your book.
Not sure . . . may be an editing error.
Why a 30A fuse shown for both alternators? Aux is shown 20A, and Main
is shown 40A (Mine is 60A). B & C supplied 2 5A field breakers & one
50A. from the B.O.M on their version of Z-14.
This is not a wiring diagram . . . adjust sizes
according to your particular constellation of
accessories.
Should have been one 15A breaker for the Aux. Alt.(Maybe I've misplaced it.)
Use fuses on b-leads OFF the panel. Field supply
breakers should be 5A
Thanks again for showing me where to get P-Lead Ferrule Kits and
shielded wire at reasonable cost.
I could use some suggestions on the most "sanitary" way to tap into
the shielded p-lead wires to get signals to the E.I.S.
I am using the Grand Rapids Technology E.I.S. & E.F.I.S. package. The
E.I.S.is mounted in the tailcone beneath the engine nacelle. Of 50
pins, 3 do nothing, 3 go to the front and the balance do various
engine monitoring chores. One wire carries serial data about
everything to the E.F.I.S displays 20ft. to the front. Better to run
3 long wires than 47!
Put a terminal block next to GRT databox to 'break out'
p-lead signals.
After power, the "fun" really starts. Two E.F.I.S. panels, Audio
panel, 1 A.H.R.S, 1 ADS-B, Remote Magnetometer, flap and trim
indicators, autopilot servos,Garmin 650. Remote G.P.S. antenna,
Remote Transponder, Strobes, Ldg. Lights, Nav Lights, Pitot Heat,
Dual nav and com antennae, marker beacon antenna, tip float camera,
analog to digital camera adapter, video selector switch, maybe fish
finder and add'tl camera, 4 fuel pumps,ldg. gear switches and last
but not least, DVD player for the copilot to watch dirty movies in
the right E.F.I.S. on the way to Air Venture.
Would covering the welding cable with oil line fire sleeve satisfy a D.A.R.?
(Exhaust will be 6 in. away.)
Yes . . .
Bob . . .
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