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MikeDunlop
Joined: 02 Jan 2012
Posts: 15
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 Posted: Wed Jul 16, 2014 1:12 pm Post subject: Z-13/8 and SD-8 |
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A little clarification required on the Z-13/8 schematic. I'm building this into a Long-Ez and have the SD-8 with all the bits from B&C.
The Z-13/8 schematic shows something that is marked as W10 that appears to be between the Dynamo and the Regulator! This does NOT appear on the schematic from B&C.
Any info on this would be appreciated.
Regards
MikeD (UK)
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johnbright
Joined: 14 Dec 2011
Posts: 165
Location: Newport News, VA
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| Posted: Sun Jan 01, 2017 10:26 pm Post subject: Re: Z-13/8 and SD-8 |
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See Note 25 as well as Z-25.
Makes the SD-8 work with no battery.
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user9253
Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan
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| Posted: Mon Jan 02, 2017 6:00 am Post subject: Re: Z-13/8 and SD-8 |
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It would be interesting to read about why the two diodes and resistor work and why the SD-8 will not work without them (unless a battery is connected).
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Joe Gores |
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nuckolls.bob(at)aeroelect
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| Posted: Tue Jan 03, 2017 10:27 am Post subject: Z-13/8 and SD-8 |
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At 08:00 AM 1/2/2017, you wrote:
| Quote: | --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>
It would be interesting to read about why the two diodes and resistor work and why the SD-8 will not work without them (unless a battery is connected).
--------
Joe Gores
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Here's a close approximation of the Ducati product used by Rotax. This
illustrates the general architecture of most rectifier/regulators over
the past 20 years or so . . .
[img]cid:.0[/img]
If you noodle through fuctionality of the circuit, you find a bridge
rectifier consisting of two diodes with cathodes tied to the output
terminal(s) . . . two silicon rectifiers with anodes connected to
ground. Control electronics for the SCRs gets power through the
"C" terminal.
With no source of power at "C" and "B" . . . the control electronics
are dark. With no control electronics, the SCRs are dormant. The
AC output from a rotating dynamo is unavailable for use.
[img]cid:.1[/img]
Adding a battery . . . even a badly discharged battery of under 10 volts
will wake up the control electronics which in turn flogs the SCRs into
action and the Dynamo/R-R system wakes up.
Adding a couple of diodes external to the R-R along with a
current limiting resistor creates the equivalent 'leaky SCRs'
where rectification through the R-R is never zero. Small but
never zero.
In the absence of a load on the usual capacitor across the
R-R output terminals, this small energy source will charge the
capacitor to a voltage that will wake-up the control electronics
and bring the system on line.
This works only if there are no loads on the system's output
that over-taxes the weak, wake-up source.
Bob . . . 
This email has been checked for viruses by Avast antivirus software.
www.avast.com
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johnbright
Joined: 14 Dec 2011
Posts: 165
Location: Newport News, VA
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| Posted: Tue Jan 03, 2017 9:02 pm Post subject: Re: Z-13/8 and SD-8 |
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To what voltage should the SD-8's PMR1C-14 regulator be set for Z-13/8?
I see for Z-12 the SD-60 and SD-20 (to use their old names) regulators are set at 14.2 and 13 volts respectively.
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user9253
Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan
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| Posted: Wed Jan 04, 2017 8:42 am Post subject: Re: Z-13/8 and SD-8 |
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Bob, thanks for that explanation.
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Joe Gores |
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