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Z101b with Shunts, Shunts as Fuse Link Junctions

 
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nuckolls.bob(at)aeroelect
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PostPosted: Fri Mar 11, 2022 10:50 am    Post subject: Z101b with Shunts, Shunts as Fuse Link Junctions Reply with quote

At 12:34 PM 3/11/2022, you wrote:
Quote:
Z101b has a very nice implementation of a single Hall Effect sensor for both alternator B-leads. The trouble I have is that I don't have an ammeter that can use a Hall Effect sensor.

I can see a few options. One is to install two shunts and use a DPDT switch to select which one presents on the ammeter.Â

That's how walter beech did it

Quote:
If I go this route, is it kosher to integrate the alternator B-lead fuse link at the shunt? For example, for the main alternator, can I run an 8g wire from the alternator to one end of the shunt, then on the other end of the shunt, run a 4" piece of 12g wire to the starter contactor? The same strategy would work for the standby alternator, with slightly different numbers and attach points.

Another option is to seek out a stand-alone ammeter that senses with a Hall Effect Sensor. But that is likely to be more expensive and more work to integrate at this stage. Is there such a thing?

Probably, but yeah not for price of a big-mac and fries.

Consider putting the ammeter in ONLY the stand-by
alternator. You've done a load analysis . . . yes?
Your main alternator is at zero risk for being
over taxed.

The S/B alternator is limited and would benefit
most from in flight knowledge of present loads.
But it's still not a flight critcal item.

Your plan-b load shedding protocols were
all established during load analysis . . . yes?

You can't overload it at vacuum pump drive pad speeds.
If you did tax beyond capability to sustain bus
voltage, you'll see it on the lo volts warning
and even before, observe it on the panel volts
display.

Panel ammeters are about as useful as foxtails on
your '57 Chevy's radio antenna. Looks cool but
adds no utility. Greatest use for ammeters is
ground diagnostics and there are other ways to
get that data.

I included that feature only because the glass-
cockpit guys include in their products. Why?
Cause they can for very little cost . . . and
it's cooler than a foxtail hanging off your
VHF COMM antenna.

If it were my airplane, I'd do the operational
protocols planning, proof them in flight testing
then rely on active notification of low volts.
Ammeters need not apply.


Bob . . .

Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"


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