Today's Message Index:
----------------------
1. 02:51 AM - switches (bob noffs)
2. 06:21 AM - Re: switches (Charlie England)
3. 06:26 AM - Re: switches (Roger)
4. 06:45 AM - Re: switches (Justin Jones)
5. 03:30 PM - Re: switches (Robert L. Nuckolls, III)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
i have 2 ecu's and 2 elec fuel pumps. my engine needs one of each to
run.the system also never wants 2 of either running at the same time. i
think there may be times when i want the master on but no power to either.
i plan to use on-off-on switches. is there any reason i am not thinking of
[wouldn't take much!] that i would want on-on switches instead?
thanks again.
bob noffs
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|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=
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
i have 2 ecu's and 2 elec fuel pumps. my engine needs one of each to run.th
e system also never wants 2 of either running at the same time. i think the
re may be times when i want the master on but no power to either. i plan to
use on-off-on switches. is there any reason i am not thinking of [wouldn't
take much!] that i would want on-on switches instead?
=C2-thanks again.
=C2-bob noffs
Just remember, as has been discussed many times on this forum, switches ar
e prone to failure!! DO NOT use one switch to select between two critical
devices, such as ECU=99s.
I used 4 ea. SPST switches, 1 for each of the 2 ECU=99s and 1 for ea
ch of the 2 fuel pumps. This method does not keep you from turning on both
ECU=99s or pumps, but my system does not care if they are all on. T
hese switches are powered from the battery bus so therefore are always powe
red even when the master is off.
Roger
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
I have the same setup that you do and I used a lever-lock on-off switch for e
ach component. No accidental switch actuation in turbulence. You must pull o
ut on the switch to turn it off.
If your system is an EFII system, it comes with an on-on ecu select switch a
lready wired into the harness.
I have an independent power switch for each ecu, fuel pump, and coil pack. T
his allows me to have the master on without any of the efii system powered.
Justin
> On Apr 2, 2016, at 06:24, Roger <rnjcurtis@charter.net> wrote:
>
>
> i have 2 ecu's and 2 elec fuel pumps. my engine needs one of each to run.t
he system also never wants 2 of either running at the same time. i think the
re may be times when i want the master on but no power to either. i plan to u
se on-off-on switches. is there any reason i am not thinking of [wouldn't ta
ke much!] that i would want on-on switches instead?
> thanks again.
> bob noffs
>
> Just remember, as has been discussed many times on this forum, s
witches are prone to failure!! DO NOT use one switch to select between two c
ritical devices, such as ECU=99s.
>
> I used 4 ea. SPST switches, 1 for each of the 2 ECU=99s a
nd 1 for each of the 2 fuel pumps. This method does not keep you from turni
ng on both ECU=99s or pumps, but my system does not care if they are a
ll on. These switches are powered from the battery bus so therefore are alw
ays powered even when the master is off.
>
> Roger
>
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
At 04:49 AM 4/2/2016, you wrote:
>i have 2 ecu's and 2 elec fuel pumps. my engine needs one of each to
>run.the system also never wants 2 of either running at the same
>time. i think there may be times when i want the master on but no
>power to either. i plan to use on-off-on switches. is there any
>reason i am not thinking of [wouldn't take much!] that i would want
>on-on switches instead?
Electrically dependent engine support is best
brought off the battery bus with EACH device
having its own, separate switch and circuit
protection.
Place 'paired' switches side-by-side so that
their proper positioning is obvious.
When you say "never" at the same time . . . what's
the hazard? Does the engine simply 'change voice',
stumble, or stop dead? THIS IS SOMETHING YOU NEED
TO KNOW. It affects your plan-b architecture and
contributes to your comfortable, competent operation
of the machine. When ever you read/hear 'never', ask
and understand the consequences.
As others have noted, interlocking paired systems
as a hedge against 'accidental' switch positioning
does not yield the best FEMA and probability for
success in all foreseeable failures. In 45 years
of slinging wire in systems on ultra-lights to Hawker
4000, I have used only ONE compliment of lever-lock
and covered switches on 4 installations . . .
Emacs!
This was done on a system that blew the A## end of the airplane off
and threw out a parachute that made the airplane very difficult to fly
while offering a way to recover an un-flyable airplane.
In this case, lever-locks and covers had nothing to do with
prevention of accidental motion and everything to do with
encouraging focused attention on the action for the purpose
of mitigating an exceedingly stressful flight condition.
I humbly suggest that if anyone is worried about 'accidental'
positioning of controls in a GA aircraft, then your knowledge of
and confidence in the operation of the airplane needs some
attention. Here's a sad example of poor attention
to understanding that got some folks killed and cost a lot
of dollars better expended elsewhere . . .
http://tinyurl.com/nrm5k2r
The two guys up front in this airplane were not an
'accident looking for a place to happen' they were simply
unqualified to be in an airplane they did not understand.
They drove right into that crash . . .
It's a matter of mind set that focuses first on crafting
an elegant system with a confident outcome for a failure
mode effects analysis as the 'cake' . . . followed up with your
understanding of how it all works as the 'frosting'.
If you understand your machine there will be no 'accidents'
in the cockpit.
Further, statistics show that should you ever find yourself
with a very silent engine up front the overwhelming predominance
of root causes are empty fuel tanks . . .
Bob . . .
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|