Today's Message Index:
----------------------
1. 12:17 AM - Rotary switch tank selection (Bob Verwey)
2. 05:49 AM - Re: O/Vprotection for internally regulated alternator (Finn Lassen)
3. 08:00 AM - Re: slightly off-topic, ATC '32 volt DC' fuse: Why not 120V? (user9253)
4. 07:18 PM - Re: O/Vprotection for internally regulated alternator (Charlie England)
Message 1
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| Subject: | Rotary switch tank selection |
I have three fuel tanks L - R - AUX
I want to use one gauge to display the selected tank's quantity.
On a similar installation I have seen, the one annoying characteristic of
the setup is the fact that there is no damping of the needle movement when
you change tanks, leading to violent swings when switching tanks.
Is there a simple way of eliminating this with some basic components added
to the switching circuit?
Message 2
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| Subject: | Re: O/Vprotection for internally regulated alternator |
I switched to that configuration in my efforts to solve my electrical
glitches.
You put the relay in series with the B+ lead.
The relay coil is powered by a breaker and the crowbar is across the
relay coil. The breaker can be as little as 1 Amp because the circuit
now only powers the relay, instead of the field winding in the alternator.
If the crowbar senses an over-voltage spike it triggers and shorts the
relay coil voltage to ground (making the breaker pop) and the relay opens.
I think Bob has reported as much as 160V output from a runaway
alternator, so the relay contacts should probably be rated for that
voltage as well as the amps the generator can normally deliver.
Finn
On 10/3/2024 11:51 PM, 1rv4 wrote:
>
> Hi
> I seem to remember there was a crowbar type overvoltage protection device for
internaly regulated alternators. It had a relay to disconnect the B-lead. Can
anyone shed some light on this or maybe I had a bad dream?
> Thanks
> Chris
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=513852#513852
>
>
Message 3
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| Subject: | Re: slightly off-topic, ATC '32 volt DC' fuse: Why |
not 120V?
I looked at a couple of glass fuses in my parts drawer. They are rated at 250
volts. I speculate that the voltage rating has to do with the distance between
the terminals. Glass fuses are an inch or more in length. The ATC and ATO
fuse terminals are a fraction of that apart. If the distance between fuse
terminals is not great enough, when the fuse blows, higher voltage can arc across
the terminals. Lawyers might also have something to to with the voltage rating.
:-)
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513855#513855
Message 4
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| Subject: | Re: O/Vprotection for internally regulated alternator |
Attached. Note that Bob later deleted references to using internally
regulated alternators. But some versions of the Z figures using dynamo
style alternators did include the relay & OV module depicted in the
attached document. Also note that recent conversations on this list
indicate that the SCR used in the OV module is no longer available. Bob is
said to be working on an updated OV module.
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On Thu, Oct 3, 2024 at 10:56=AFPM 1rv4 <fconsult@telus.net> wrote:
>
> Hi
> I seem to remember there was a crowbar type overvoltage protection device
> for internaly regulated alternators. It had a relay to disconnect the
> B-lead. Can anyone shed some light on this or maybe I had a bad dream?
> Thanks
> Chris
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=513852#513852
>
>
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