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klehman(at)albedo.net
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 Posted: Sat Mar 22, 2008 5:28 am Post subject: Plane Power Alternator Failure (brand new) |
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gmcjetpilot(at)yahoo.com wrote:
| Quote: | Gentlemen all, you are gussing.
Call PP & send it back. Get the real reason. PP does modify the
regulator & therefore he's the source of creditable facts. I can say
a stock ND should not get hot with BAT/ALT on, but I stand to
be corrected. I never tried it. However............
For a regular internally regulated ND alternator, if it uses more than
50 millivolts, with the engine shut down you have voltage regulator or
diode issue. Internally regulated alternators do not have a FIELD
WIRE of course.
>From: Ken <klehman(at)albedo.net <mailto:klehman(at)albedo.net>>
>Subject: Re: Plane Power Alternator Failure (brand
new)
>Would not surprise me Vern. My wee ND IR alternator draws a couple of
>amps and heats up quite noticeably with the engine off and the IGN
>terminal (and B+ lead) connected to the battery. Fortunately the OV
>relay lets me disconnect it by opening the alternator control switch.
>Ken
Ken is it possible you are reading more than the alternator? Master
contactor?
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No
It was purchased new about 5 years ago and it always did this. Of course
in a car the Ign terminal would not be powered with the key in the off
or accessory position. Newer models might sense rotation before they
power the field. But apparently this 40 amp unit that often is found on
small industrial equipment is not that sophisticated.
Ken
ps. I assume you meant to type 50 milliamps above. I've never seen
anything near that high (yet) but standby parasitic current "leakage" is
getting ridiculous on cars these days.
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gmcjetpilot
Joined: 04 Nov 2006
Posts: 170
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| Posted: Sun Mar 23, 2008 12:28 am Post subject: Plane Power Alternator Failure (brand new) |
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Yes I meant 50 milliamps and you are right with all the
memory keep alive, the parasitic drain is high. I travel
and have to sometimes disconnect the battery. I have
one of those battery disconnect terminals. It's an old car
1990 but it still has a computer, so I lose the codes and
fuel injection mapping. But its better than jumping the
the thing.
I have some small industrial ND's, new genuine
NipponDenso. I'll test it on mine. Interesting.
You are right, in a car the IGN is not ON unless the
driver puts the IGN switch to the IGN position.
Even the industrial alternators have a "soft start"
function. The internal VR sense voltage from several
places internally from the rotor, stator, rectifier and
externally, b-lead, ign and even a remote voltage sense
in some models. It does not see RPM, but it sees that
EMF from the rotation. With internal timers it ramps the
voltage regulator on. So it probably tickles the field a little
to get things going, but the ON drain should through the
IGN lead is always small . I guess 50 milliamps, but it
may be switching the B-lead drain on. The field voltage
comes from the b-lead not the IGN lead. The IGN as
you know is just an WAKE / SLEEP signal.
I wounder if its a leaky rectifier diode?
I'll test this. I never checked this. I want to understand
how the internal VR works. I wonder what an external
VR does being on for a long time before spinning it?
>From: Ken <klehman(at)albedo.net>
| Quote: | Subject: Re: Re: Plane Power Alternator Failure (brand new)
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| Quote: | No It was purchased new about 5 years ago and it always did this.
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>ps. I assume you meant to type 50 milliamps above. I've never seen
| Quote: | anything near that high (yet) but standby parasitic current "leakage"
>is getting ridiculous on cars these days.
|
Be a better friend, newshound, and [quote][b]
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