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To: flyrotary@lancaironline.net
Date: Tue, 24 May 2005 08:07:04 -0400
Subject: Re: [FlyRotary] Re: Amps consumed data
Message-ID: <20050524.080705.3320.1.JBKER@juno.com>
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From: WALTER B KERR <jbker@juno.com>


>  Are you saying that you are running an internally regulated, 
> 'one-wire' 
> alternator & you were measuring current, not voltage? If so, the 
> current 
> measurement dropping to zero when you break the B-lead doesn't mean 
> the 
> alternator isn't 'putting out.' There won't be any current flowing 
> because the circuit is no longer complete, but the alternator can 
> still 
> be producing voltage potential at the B-lead terminal. The only way 
> to 
> tell is to have a volt meter hooked directly to the B-lead terminal 
> when 
> you open the B-lead. Same idea as an electrical outlet in your 
> house: 
> 120 VAC al the time but no current until you plug something in & 
> turn it on.
> 
> The aeroelectric list hand-wringing about 'load dump' should only be 
> 
> relevant if you lose the connection to the *battery*. If the 
> regulator 
> fails & allows unregulated output from the alternator then the 
> B-lead 
> overvoltage disconnect relay described in the 'Connection' is what 
> prevents the high voltage from damaging the a/c electronics. By the 
> time 
> you get to this point, 'load dump' is meaningless because the result 
> of 
> load dump (overvoltage) has already happened & preventing load dump 
> is 
> no longer an issue.
> 
> We'll talk when you get here on Friday.
> 
> Charlie
> 
---------------------------------
Maybe I misled you. There are 2 wires hooked to the alternator. Only one
wire of the 3 on the plug, but the heavy wire going to the battery is
where I measured current. Are you saying I should measure the voltage on
the small connector wire?

I'm sure you can straighten me out this week end when we're are talking.

Thanks
Bernie