Today's Message Index:
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1. 06:21 AM - Re: LR3 regulator Amperage indications (Bill Schertz)
2. 06:35 AM - Re: LR3 regulator Amperage indications (Robert L. Nuckolls, III)
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Subject: | Re: LR3 regulator Amperage indications |
Bob,
The heavy lead from the Alternator feeds through a hall effect sensor that
is supplied by and read by a Blue mountain EFIS to supply a 0-5 volt signal
that is calibrated for amperage.
The Voltage readings are on the main bus, and also the e-bus (Reads a few
tenths lower because of diode) and they are nice and stable.
Bill Schertz
KIS Cruiser #4045
N343BS
----- Original Message -----
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Sent: Friday, April 24, 2009 5:16 PM
Subject: Re: AeroElectric-List: LR3 regulator Amperage indications
> <nuckolls.bob@aeroelectric.com>
>
> At 03:57 PM 4/24/2009, you wrote:
>><wschertz@comcast.net>
>>
>>Bob,
>>Does the LR3 regulate the voltage by switching the current on/off? or by
>>smoothly varying the field circuit. I have a data recorder taking samples
>>every 5 seconds, and the current jumps up and down, while the voltage is
>>quite steady. Is this normal?
>
> Where are you measuring current and voltage? The LR series
> regulators are linear devices i.e. smoothly variable DC output
> voltage. But without knowing exactly where you are sampling
> voltage and current, I'm unable to deduce the significance
> of your observations.
>
>
> Bob . . .
>
> ----------------------------------------)
> ( . . . a long habit of not thinking )
> ( a thing wrong, gives it a superficial )
> ( appearance of being right . . . )
> ( )
> ( -Thomas Paine 1776- )
> ----------------------------------------
>
>
>
Message 2
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Subject: | Re: LR3 regulator Amperage indications |
At 08:17 AM 4/25/2009, you wrote:
>
>Bob,
>The heavy lead from the Alternator feeds through a hall effect
>sensor that is supplied by and read by a Blue mountain EFIS to
>supply a 0-5 volt signal that is calibrated for amperage.
>
>The Voltage readings are on the main bus, and also the e-bus (Reads
>a few tenths lower because of diode) and they are nice and stable.
>Bill Schertz
>KIS Cruiser #4045
>N343BS
Okay, how much do the current readings "wiggle". Remember
that a 3-phase rectified AC output alternators has about 5%
pk-pk ripple on it. Further, there are diode switching
transients that can expand the total pk-pk level of noise
to 10% or so of bus voltage. Depending on the roll-off in
frequency response of your data acquisition system, you may
be sampling the effects of this noise.
Try putting a 1000 ohm resistor in series with your sample
sense line an a 10 mF capacitor across the line on the
line away from the sense point. This will roll off your
frequency response to about 100 Hz. See if this doesn't
settle the readings considerably.
The fact that your bus voltage is stable suggests that
the phenomenon you're observing is a product of measurement
technique and not a suggestion of poor system performance.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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