| Charlie
Don’t know if it is wise but I have wired our electron traffic management as follows: 1. A Main 32 way blade fuse block which is broken into two busses: A & B being - (The blade fuse block enables me to patch a current meter to any circuit to see whats happening. Helpful when setting up or trouble shooting but just nice and compact otherwise BUT I can’t just re-energise a circuit like with circuit breakers, though blade size circuit brakes do exist nowadays. This main fuse block is mounted directly below main system switches so is very accessible)
A. FLIGHT CRITICAL (16 fuses) fed by a keyswitch: EC2(A), EC2(B), EM3, O2, Prop Pitch, Engine Fuel Pres Pump, Engine Backup Fuel Pres Pump, Fuel Transfer Pump, Backup Fuel Transfer Pump, Pri Fuel Injectors, Sec Fuel Injectors, Leading Coils, Trailing Coils. Notes 1. All engine fuel is fed from a header tank of 8 gallons with the transfer pumps feeding the header from the main wing tank Note 2. Separate power and return feeds to Pri and Sec Inj & Leading and Trailing Coils, fuel pumps.
B. AVIONONICS (16 fuses) feb by Avionoics master switch: RHS Dynon EFIS, FHS Dynon EFIS, Flight Computer of my own, Com Radio, Transponder, Autopilot servos, Position Lights, Strobe Lights etc,
C. LANDING GEAR PUMP switched through seperate breaker (this mongrel draws ~30 amps)
Our airplane is plastic so return lines are very important. We have separate main return paths - quiet and noisy.
Steve
Wow, Steve, that's great detailed info;
I was just hoping to get the total. I was expecting the injectors
to draw more than the coils, but with all the coils together under
5 amps (and even better for the injectors), then my wiring
architecture can get a lot simpler.
Many thanks,
Charlie
On 7/1/2014 7:19 PM, steve Izett wrote:
Hi Charlie
I think these are in the ball park but not measured under
flying conditions only idle.
ENGINE EC2
.3 EM3
.5 COILS
(D585) 5 INJECTORS
(Renesis) 2 FUEL
PRESSURE PUMP x 1 8.4 FUEL
TRANSFER PUMP x 1 1.6 O2
SENSOR 0.6 Total
Engine 18.4
Steve Izett
Has anyone with an ammeter installed measured
their engine's actual current draw (controller, injectors,
plugs, fuel pump) with everything but the engine shut
down, and the alternator offline? IIRC, Bernie Kerr once
did a battery duration test & discontinued after ~40
minutes, but I don't recall seeing any actual current
measurements.
Thanks,
Charlie
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