Today's Message Index:
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1. 07:51 AM - Re: Re: Alternator Disconnect Z17 vs Z20... (Steve Stearns)
2. 07:57 AM - Re: Re: Alternator Disconnect Z17 vs Z20... (Steve Stearns)
3. 08:19 AM - Re: Re: Alternator Disconnect Z17 vs Z20... (Robert L. Nuckolls, III)
4. 09:12 AM - Re: Alternator Disconnect Z17 vs Z20... (user9253)
5. 01:21 PM - reset time for crowbar (Ken Ryan)
6. 06:15 PM - Re: reset time for crowbar (Robert L. Nuckolls, III)
Message 1
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Subject: | Re: Alternator Disconnect Z17 vs Z20... |
Bob N. asked:
"Are you planning to use one of these two rectifier/regulators
or some other product? 170 watts of output probably translate
to about 14A maximum available output from the r/r . . . do
you plan electric start? Have you conducted a load
analysis of all planned accessories to determine
that you have enough engine driven power to support
the load?"
Steve replies:
The 264 870 regulator is listed in the engine manual (all I have is hard
copy) and on line from rotax suppliers. I don't have a spec sheet on it
but given the pictures (big module with a heat sink) it's more than a diode
bridge. The engine manual says it doesn't require any load to be in
regulation. Our configuration will have electric start and it looks like
it needs a good bit of juice per the manual (16AH min battery 10mm2 wire,
which looks to me like 2AWG. Engine up front, battery in back so 20' of
heavy cable. <sigh>. The load analysis shows there is plenty of juice
(Dynon D60, low-power transponder, radio and engine monitor, LED tip lights
and only one halogen on the tail).
There are clearly (at least) two version of the 503 (as older one removed
has one spark plug per cylinder and the newer one installed has two). If I
run across a link for the manuals I have I'll forward them to you.
New sanity-check question:
The rotax documentation specifies a 16A fuse between the regulator and ship
loads (including battery). I'm assuming the location of this fuse is
determined by the same factors as an ANL on an alternator equipped ship
and, as such, I've put the fuse next to the battery in back, not up front
with the regulator. Is there anything about a PM dynamo/regulator
combination that would drive putting the fuse up near the regulator? (I
still would want something in back near the battery...)
Thanks for your help,
Steve.
Message 2
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Subject: | Re: Alternator Disconnect Z17 vs Z20... |
P.S. Bob N., It looks like you have the same engine manual as I. Check
http://www.aeroelectric.com/Mfgr_Data/Rotax/Rotax_503_Electrical.pdf page
18-5.
Steve.
Message 3
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Subject: | Re: Alternator Disconnect Z17 vs Z20... |
>Thanks for your help,
Good data dump! Need to run a mini-van load
of grandkids to ICT but will pray over your
posting a bit this evening.
Bob . . .
Message 4
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Subject: | Re: Alternator Disconnect Z17 vs Z20... |
Perihelion Design sells lightweight copper-clad cable. http://www.periheliondesign.com/fatwires.htm
> Is there anything about a PM dynamo/regulator combination that would drive putting
the fuse up near the regulator?
Alternators and dynamos are self current limiting. A dynamo rated at 13 amps will
not put out much more than that even if the output is shorted. So there is
no need to put a fuse near the dynamo or regulator. A fuse is needed near the
battery to protect the wires from excessive battery current if a wire is ever
shorted to ground.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=435710#435710
Message 5
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Subject: | reset time for crowbar |
How long does it take for the crowbar OVP device to reset, once the over
voltage condition has been removed?
Message 6
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Subject: | Re: reset time for crowbar |
At 15:18 2014-12-14, you wrote:
>How long does it take for the crowbar OVP device to reset, once the
>over voltage condition has been removed?
Power to activate an ov trip comes through the
field supply circuit breaker. As soon as the
crowbar 'trips' . . . voltage to the field
drops to about 1.5v until the breaker opens
10-20 milliseconds later whereupon the
field voltage falls to zero.
The crowbar module 'latches' ON for
as long as any substantial amount of current flows
through it. So as soon as the breaker opens, the
SCR current goes to zero, the crowbar module is
then 'unlatched' or officially 'reset' depending on
which term you prefer.
Bob . . .
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