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Sequence for bringing alternators on line.

 
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nuckolls.bob(at)aeroelect
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PostPosted: Sat Jul 07, 2018 8:43 am    Post subject: Sequence for bringing alternators on line. Reply with quote

At 12:18 AM 7/7/2018, you wrote:
Quote:
I was out at the aircraft today programming checklists and limits, had the alternator switch in the main position with the engine not running and noticed a 7 amp draw which seemed excessive for what was on. Turned the alternator switch to off and the draw went to 3 amps. Put my hand on the alternator and it was hot to the touch. Alternator is a Lamar with internal regulator. Is it normal for a non-turning alternator to be drawing 4 amps? If so then I think we'll leave it off until after start and turn it off before shutdown.

Battery on, alternator on, engine not running.

Regulator says alternator output is too low and
responds by applying full battery voltage to the
field . . . bus voltage remains low because
the engine is not running.

Field warms up . . . but not dangerously so.

Downside is significant, unnecessary load on
the battery during battery only ground ops.
Using the S700-2-10 master switch helps avoid
this condition.



Bob . . .


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nuckolls.bob(at)aeroelect
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PostPosted: Sun Jul 08, 2018 6:43 am    Post subject: Sequence for bringing alternators on line. Reply with quote

At 01:23 PM 7/7/2018, you wrote:
Quote:
Oh, Sebastien:

Human nature being what it is... There have been MANY a Power Loss issue by pilots starting on Just the Master and Forgetting to turn the Alternator ON.
Really reeks hell on the radio and especially with planes with electrical re-tracts.

If an airplane were fitted with but one
annunciation of electrical system condition,
I'd go for the low voltage warning light.
Like the battery ammeter of old, it's
one device that gives you the most
information about system condition
in a single instrument . . . albeit
a bit tricky to interpret for some
conditions . . . also easy to ignore.

A single, flashing light that operates
below 13.0 volts is the modern and
more attention getting alternative.



Bob . . .


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JOHN TIPTON



Joined: 17 Sep 2006
Posts: 240
Location: Torquay - England

PostPosted: Sun Jul 08, 2018 6:55 am    Post subject: Sequence for bringing alternators on line. Reply with quote

For those of you who have the 'PlanePower' (internally regulated, externally controlled) alternator (likes RVs) have the option of fitting the optional 'Alternator out' light, indicating no alternator output or alternator 'F' lead switch not closed.
John

Sent from my iPad

----x--O--x----
On 8 Jul 2018, at 3:42 pm, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
Quote:
At 01:23 PM 7/7/2018, you wrote:
Quote:
Oh, Sebastien:

Human nature being what it is... There have been MANY a Power Loss issue by pilots starting on Just the Master and Forgetting to turn the Alternator ON.
Really reeks hell on the radio and especially with planes with electrical re-tracts.

If an airplane were fitted with but one
annunciation of electrical system condition,
I'd go for the low voltage warning light.
Like the battery ammeter of old, it's
one device that gives you the most
information about system condition
in a single instrument . . . albeit
a bit tricky to interpret for some
conditions . . . also easy to ignore.

A single, flashing light that operates
below 13.0 volts is the modern and
more attention getting alternative.



Bob . . . =================================== st">http://www.matronics.com/Navigator?AeroElectric-List =================================== cs.com =================================== om =================================== matronics.com/contribution ===================================


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