nuckolls.bob(at)aeroelect
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 Posted: Fri Dec 29, 2023 6:53 am Post subject: PMag power requirements |
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At 09:19 PM 12/28/2023, you wrote:
| Quote: | Hi Bob,
I would answer on Aeroelectric List if I could. I get the postings by email but I can't answer due to longstanding technical issues with the forum. My next try at a resolution will be a postal letter to Matt Dralle.
Re your post 19 at http://forums.matronics.com/viewtopic.php?t=16781981
I'm writing because I believe it is incorrect that the Pmag bus power feeder is "about 0.04A". I have no idea where you got that number. This feeder is EI power for starting and in case of Pmag internal |
You are correct. Emag specs and installation sheets are not
satisfyingly clear on their electrical requirements.
Had to dig around in some older EMag literature
to come up with the attached illustration:
That 0.04A number was for bus supply loads
under normal operation above 1800 rpm or
so on a PMag. Obviously, should the internal alternator
fail (exceedingly unlikely) demands from
ship's bus will be on the order of 0.3 to 0.7A
depending on rpm.
NOTE: the attached figure is exemplar data
captured from EMagair literature from
some years back.
This thread illustrates an oft ignored
hazard for not having manufacturer's
published data. I've not spoken with
the guys for some years. I'll call them
tomorrow to renew acquaintance. I'm
planning on a trip to Ft. Worth in March . . .
will plan on visiting them.
I'll suggest some updating of their
electrical performance data would be
helpful.
In the mean time, I'll update my suggestion
to utilize a "Polyswitch" . . . a solid
state, self-resetting fault limiter.
https://tinyurl.com/yu2tjncu
I've used these in numerous applications over
the years. These are NOT a universal replacement
for fuses/breakers/limiters BUT in this case
I think it will fill the bill. I've added
some to an order from Digikey. I want to
do a bit of bench testing. I'll have some
to 'donate to the cause'.
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
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