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dsvs(at)ca.rr.com
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 Posted: Mon Mar 03, 2008 8:18 pm Post subject: New EMAG and PMAG Wiring question |
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Bob, I just looked at the new?? fig 13-8 and I have a few questions. The
Pmag wiring shown would require you to turn off the main bus to test the
PMAG self power. Is this your intention? Would another method such as
using the Emag method shown with the addition of a switch between the bat
bus and the S700 2 10 switch also work. If so do you see any problems with
this set up? Thanks. Don
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nuckolls.bob(at)cox.net
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| Posted: Mon Mar 03, 2008 8:44 pm Post subject: New EMAG and PMAG Wiring question |
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At 08:13 PM 3/3/2008 -0800, you wrote:
| Quote: |
Bob, I just looked at the new?? fig 13-8 and I have a few questions. The
Pmag wiring shown would require you to turn off the main bus to test the
PMAG self power.
|
Yup. You don't need to test it every flight.
| Quote: | Is this your intention?
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Yes. This is Emagair's recommendation.
| Quote: | Would another method such as
using the Emag method shown with the addition of a switch between the bat
bus and the S700 2 10 switch also work. If so do you see any problems with
this set up? Thanks. Don
|
No . . . except it complicates the system by adding
a function that is seldom needed and easily accommodated
by killing the main bus . . . like you COULD test the alternate
feed switch at every pre-flight during an ignition test.
Depends on how often you believe it's useful.
The design goal was to accommodate needed functionality
with a minimum of parts count and pilot workload.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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dsvs(at)ca.rr.com
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| Posted: Mon Mar 03, 2008 9:03 pm Post subject: New EMAG and PMAG Wiring question |
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Thanks Bob. I forgot to mention that I have 2 PMAGS and like the idea of
running them from the always hot battery bus.
--
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nuckolls.bob(at)cox.net
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| Posted: Tue Mar 04, 2008 6:10 am Post subject: New EMAG and PMAG Wiring question |
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At 09:00 PM 3/3/2008 -0800, you wrote:
| Quote: |
Thanks Bob. I forgot to mention that I have 2 PMAGS and like the idea of
running them from the always hot battery bus.
|
It's your airplane. I'm only echoing a design philosophy
that's recommended by the manufacturer supported by
a elegant assemblage of simple-ideas. You'll need to
do something different with respect to the switching.
Bob . . .
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mprather(at)spro.net
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| Posted: Tue Mar 04, 2008 9:13 am Post subject: New EMAG and PMAG Wiring question |
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This idea may have been hashed/rehashed enough, but I can't resist putting
in my two cents..
Bob has said (and others have agreed) that it makes sense to design system
architecture to comfortably deal with single failures gracefully. The
odds of having multiple component failures on a single flight is
comfortably unlikely, given good component selection and best practices
installation/implementation methods. This is how to have low cost fault
tolerance.
In my opinion, the P-mags are best powered from the main bus. Their
operation on internal power can be checked regularly (once per flying
day?). If an in-flight situation develops that warrants shutting down the
main bus (electrical fire, main alternator failure, etc.), I think you
can be confident that both p-mags will continue to function on internal
power. No sweat. This is one of the beauties of the P-mags - they allow
for more easy fault tolerance. I believe this is part of the rationale of
the recommended wiring configuration.
You say, "you like the idea of running them (the P-mags) from the always
hot battery bus." Can you explain why you like the idea of this?
Regards,
Matt-
| Quote: |
<nuckolls.bob(at)cox.net>
At 09:00 PM 3/3/2008 -0800, you wrote:
>
>
>Thanks Bob. I forgot to mention that I have 2 PMAGS and like the idea of
>running them from the always hot battery bus.
It's your airplane. I'm only echoing a design philosophy
that's recommended by the manufacturer supported by
a elegant assemblage of simple-ideas. You'll need to
do something different with respect to the switching.
Bob . . .
|
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dsvs(at)ca.rr.com
Guest
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| Posted: Tue Mar 04, 2008 12:43 pm Post subject: New EMAG and PMAG Wiring question |
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Matt and Bob. Thanks for the replies. I guess this was just a left over idea from Bob's original design. Both of my PMAGs will be powered from the main bus. Don
---- Matt Prather <mprather(at)spro.net> wrote:
| Quote: |
This idea may have been hashed/rehashed enough, but I can't resist putting
in my two cents..
Bob has said (and others have agreed) that it makes sense to design system
architecture to comfortably deal with single failures gracefully. The
odds of having multiple component failures on a single flight is
comfortably unlikely, given good component selection and best practices
installation/implementation methods. This is how to have low cost fault
tolerance.
In my opinion, the P-mags are best powered from the main bus. Their
operation on internal power can be checked regularly (once per flying
day?). If an in-flight situation develops that warrants shutting down the
main bus (electrical fire, main alternator failure, etc.), I think you
can be confident that both p-mags will continue to function on internal
power. No sweat. This is one of the beauties of the P-mags - they allow
for more easy fault tolerance. I believe this is part of the rationale of
the recommended wiring configuration.
You say, "you like the idea of running them (the P-mags) from the always
hot battery bus." Can you explain why you like the idea of this?
Regards,
Matt-
>
> <nuckolls.bob(at)cox.net>
>
> At 09:00 PM 3/3/2008 -0800, you wrote:
>
>>
>>
>>Thanks Bob. I forgot to mention that I have 2 PMAGS and like the idea of
>>running them from the always hot battery bus.
>
> It's your airplane. I'm only echoing a design philosophy
> that's recommended by the manufacturer supported by
> a elegant assemblage of simple-ideas. You'll need to
> do something different with respect to the switching.
>
> Bob . . .
>
>
>
>
>
>
|
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ssamps(at)gmail.com
Guest
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| Posted: Tue Mar 04, 2008 11:57 pm Post subject: New EMAG and PMAG Wiring question |
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Don _ I have wired my 2 p-mags as follows. Both are connected via a fuse to the main bus. I have then used two 2-50 switches, one for each mag.
- in the bottom position with the master on, the P-mag was powered, but the P-lead off.
- in the middle position (and this is the normal flying position) the power and P-lead is on.
- in the top, momentary position, the power is cut. (To test the self generation.) The P-lead remains on.
Operating this way the P-mag would see power once the master is on. It would only loose power from the battery when the engine is running and you switch to the self generation test. P-mag condone that.
So to test say the RH mag before takeoff, you turn the LH mag's plugs off, by pushing the switch down from the middle position. It remains powered but the p-lead is off. You then lift the RH switch. It should keep running if it is self generating.
It is very close to the e-mag wiring but permits just two switches.
It makes sense to me. Steve.
[quote][b]
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