Bill;
I have dual batteries. The ‘engine critical’
bus (actually a fuse holder) is connected to both batteries with a Schottky
diode in each line for isolation. From the fuse holder terminals go the
leads for each set of injectors, each set of coils, backup fuel pump, backup
ECU, and backup EFIS. Then to switches on the panel. I concluded
that was as direct and reliable as I could get.
It requires turning off the injector and ignition disable
switches when shutting down the engine. All other power (including normal
pump, ECU and EFIS) goes through battery contactors, one for each battery.
Be aware (as I learned later) that this leads to a
complication when trying to reset the EC2 mixture correction table back to
default of zeros. With the injector disable switches off, it is
equivalent to having the cold start switch on; which – at least on my 20B
controller – results in some legacy default correction table.
FWIW,
Al
-----Original
Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf
Of Bill Bradburry
Sent: Thursday, October 19, 2006 7:53 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Powering fuel injectors
I
am using Z-19 from the Aeroelectric Connection as a guide for wiring
my
plane. I would like to power the injectors from the battery buss.
Looking
at Z-19, do I need to install a complete switch and diode system
for
the injectors like is done for the fuel pump and ECU, or can I tie
on
to the fuel pump OR the ECU system after either the switch (add a
separate
diode) or after one of the diodes?
There
will be the two DPDT switches to disable the primary and secondary
injectors
after this connection.
My
panel is becoming somewhat switch festooned and I would like to keep
more
switches to a minimum.
How
have you guys accomplished this?
Thanks.
Bill
B
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