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longg(at)pjm.com
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 Posted: Tue Jan 04, 2011 10:57 am Post subject: IR Alternator Voltage |
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Good Afternoon,
I am using a Lamar 80 Amp Internally Regulated Alternator which is
currently charging at 13 volts. That often puts my B & C low voltage
indicator in the blinkety-blinkety state.
Sorry, I don't have the model specifics with me (can get later) but off
the top are there ways to adjust the output of IR type alternators or is
that a factory setting that cannot be changed? Is this an "it depends"
item?
Thanks,
Glenn Long
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nuckolls.bob(at)aeroelect
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| Posted: Tue Jan 04, 2011 1:11 pm Post subject: IR Alternator Voltage |
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At 01:53 PM 1/4/2011, you wrote:
| Quote: |
Good Afternoon,
I am using a Lamar 80 Amp Internally Regulated Alternator which is
currently charging at 13 volts. That often puts my B & C low voltage
indicator in the blinkety-blinkety state.
|
Yup, they'll do that . . .
| Quote: | Sorry, I don't have the model specifics with me (can get later) but off
the top are there ways to adjust the output of IR type alternators or is
that a factory setting that cannot be changed? Is this an "it depends"
item?
|
Probably not. I've never seen an adjustable regulator on
an internally regulated machine. In fact, most external
regulators were not adjustable either.
Before you take a wrench to the airplane, check the
alternator output voltage at the alternator's b-terminal.
The internal regulator senses b-terminal voltage and
there MAY be a difference. You can probably buy a
replacement regulator but depending on the alternator,
it might be lest hassle/expense to trade it in.
Bob . . .
Bob . . .
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eschlanser
Joined: 08 Apr 2010
Posts: 60
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| Posted: Sat Oct 07, 2017 11:34 am Post subject: Re: IR Alternator Voltage |
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| Quote: | Sorry, I don't have the model specifics with me (can get later) but off
the top are there ways to adjust the output of IR type alternators or is
that a factory setting that cannot be changed? Is this an "it depends"
item?
|
| Quote: | Probably not. I've never seen an adjustable regulator on
an internally regulated machine. In fact, most external
regulators were not adjustable either. |
| Quote: | Before you take a wrench to the airplane, check the
alternator output voltage at the alternator's b-terminal.
The internal regulator senses b-terminal voltage and
there MAY be a difference. You can probably buy a
replacement regulator but depending on the alternator,
it might be lest hassle/expense to trade it in.
Bob . . . |
[/quote]
I'm having the same need as the OP. That is, low displayed voltage from my IR alternator. I understand the directions but do not know how to implement them on a running airplane. This may be an electric 101 question. How do I physically check the alternator output voltage at the alternator's b-terminal? I don't have anyone willing to reach in and hold the voltmeter test leads on a running airplane.
Eric
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nuckolls.bob(at)aeroelect
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| Posted: Sat Oct 07, 2017 3:47 pm Post subject: IR Alternator Voltage |
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| Quote: |
I'm having the same need as the OP. That is, low displayed voltage from my IR alternator. I understand the directions but do not know how to implement them on a running airplane. This may be an electric 101 question. How do I physically check the alternator output voltage at the alternator's b-terminal? I don't have anyone willing to reach in and hold the voltmeter test leads on a running airplane.
Eric |
Easy, don't PROBE the points of interest, CLIP them.
I very seldom use 'probes' for any measurement, virtually
all signals of interest need to be sampled while your
hands are fully occupied with other tasks.
[img]cid:7.1.0.9.0.20171007183910.003ce7c0(at)aeroelectric.com.0[/img]
I have several dozen clip leads sets in the various
tool boxes and workbenches. As a general rule, I make
them up with a minimum 36" long. I have a couple of
sets that are 10' long. I once built a special clip
set about 40' long to watch a voltage in the 'hell hole'
of a Beechjet whilst I was fiddling with knobs in
the cockpit.
Built yourself a 10' pair. Clip to points of interest
under the cowl then sit in the cockpit taking voltage
readings ar various rpm and loads. Tape the leads
to under side of cowl to keep prop wash from shaking
the wires so bad that it pulls the clips off . . .
been there, done that.
Bob . . .
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