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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, MD
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
than a brief period (ex, when flaps/gear are coming up on a go
around), my 7.5amp circuit breaker "FIELD" for the main alternator
pops. Of course, the alternator output then ceases.
An added observation: In addition to the HYDRALIC ON lamp
illuminating during pump action, the alternator's WARNING LIGHT
always flashes during (and only during) hydralic pump running
(regardless of whether the CB will pop).
Of course, with hydralic pump on, it uses some 40 amps (as seen on
the JPI ammeter). If this is sustained any more than briefly, the
Field CB pops. The 50 amp Hydralic CB does not pop (annd is
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 >
alternator output. Does this mean the Voltage Regulator for the
alternator is failing me when the hydralic pump demands exceed
capacity of voltage regulator to do its job? Should I replace the
voltage regulator?
Third...or does this mean that I have some sort of current misdirect,
when output demands (ie,hydralic pump) exceed supply (alternator
output), such the current must come from the battery to make up the
difference, and it does it through the FIELD circuit
(inappropriately), exceeding 7.5 amp CB tolerance? Of course, the
battery is directly hooked up to the BUSS, and the hydralic pump can
be run without engine or alternator tuning, directly from the BUSS.
A short somewhere?
Who among us understands alternators and can tell me where to look
(more than what I've done)?
Jeff L
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