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From: "Greg Goodrich" <greg@afshhi.com>
Subject: RE: [LML] Re: Alternator & Hydralic Pump Question (LIVP): Field CB
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Noel, can you share your Mechanic and consultant I have the same =
problem,
greg goodrich LIVP N456A 843-247 7236

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of =
Noel
Quinones
Sent: Sunday, December 31, 2006 8:27 PM
To: lml
Subject: [LML] Re: Alternator & Hydralic Pump Question (LIVP): Field CB


Jeff:

Please write to my mechanic in TALAHASSE and my CONSULTANT in Merrit =
Island.

I went through similar issues and both of them they worked and talked
extensively about it.

Noel
LIVP N9070R

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of
Jeffrey Liegner, M
Sent: Sunday, December 31, 2006 12:25 PM
To: lml
Subject: [LML] Alternator & Hydralic Pump Question (LIVP): Field CB

Lancair IVP.  TSIO550E.  Standard 65amp primary alternator.  Buss A.


Alternator with Hydralic Pump Problem:

Sometimes when my hydralic pump (gear, flaps) is running for more=20
than a brief period (ex, when flaps/gear are coming up on a go=20
around), my 7.5amp circuit breaker "FIELD" for the main alternator=20
pops.  Of course, the alternator output then ceases.

An added observation: In addition to the HYDRALIC ON lamp=20
illuminating during pump action, the alternator's WARNING LIGHT=20
always flashes during (and only during) hydralic pump running=20
(regardless of whether the CB will pop).

Of course, with hydralic pump on, it uses some 40 amps (as seen on=20
the JPI ammeter).  If this is sustained any more than briefly, the=20
Field CB pops.  The 50 amp Hydralic CB does not pop (annd is=20
perfectly happy).

QUESTIONS:

FIrst...is 7.5 amp field CB correct?  I thought it was, but maybe not?

Second, warning light should come on when battery voltage >=20
alternator output.  Does this mean the Voltage Regulator for the=20
alternator is failing me when the hydralic pump demands exceed=20
capacity of voltage regulator to do its job?  Should I replace the=20
voltage regulator?

Third...or does this mean that I have some sort of current misdirect,=20
when output demands (ie,hydralic pump) exceed supply (alternator=20
output), such the current must come from the battery to make up the=20
difference, and it does it through the FIELD circuit=20
(inappropriately), exceeding 7.5 amp CB tolerance?  Of course, the=20
battery is directly hooked up to the BUSS, and the hydralic pump can=20
be run without engine or alternator tuning, directly from the BUSS.=20
A short somewhere?

Who among us understands alternators and can tell me where to look=20
(more than what I've done)?

Jeff L

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