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Z-13/8 some questions

 
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rparigor(at)SUFFOLK.LIB.N
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PostPosted: Tue Jan 31, 2006 10:27 pm    Post subject: Z-13/8 some questions Reply with quote

I am trying to shoehorn my needs into a Z-13/8 and have some questions.

Our Europa has a Rotax 914 and want to use a ND alternator on the vacuum
pad as primary alternator with a LR3C regulator and use the internal
generator as Aux alternator. The battery will be between 12 and 18 amps
located aft of the motor and Main-Bus and E-Bus by 7 feet (~ 14 feet of
wire) run will be using #4 wire.

1) Will the LR3C be happy if I connect the #6 Bus to my Main Bus, or
should it really go closer to the battery?

2) Will the LR3C be happy if I connect the #3 OV sense wire to my Main
Bus, or should it really go closer to the battery?

3) Rotax install manual wants difference between terminal C of the
regulator and the battery to be less than .2V, is this achievable with 12
feet of wire and a max load of 30 amps? What would happen if more than .2V
difference?

4)Rotax Install manual states" never sever connection between terminal C
and +B of regulator e.g. by removal of fuse"

Z-16 which is designed for only use of internal Rotax generator looks like
it disconnects C and +B, Z-13/8 which uses a SD8 as a aux alternator only
makes or breaks the output of SD-8.

When using Rotax internal generator as Aux on Z-13/8 do I want to follow
Z-16 and sever, or follow Z-13/8 and leave C and +B connected and only
make and break output?

5) Rotax install manual recommends a 30 amp slow blow fuse on output of
regulator, is a 16AWG Fuselink as used in Z-16 equivalent to a 30 amp slow
blow fuse?

6) On Z-13/7 E-Bus has a 20 AWG Fuse-link,16AWG wire, switch and 7 amp
fuse:
Z-32 Heavy Duty E-Bus Feed bumps up wire to 14AWG, a 10 amp fuse and a
relay instead of a switch
a) For the 3 additional amp fuse, why did a relay replace switch?
b) Why was Fuse-link dropped?

Thx.
Sincerely
Ron Parigoris


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nuckollsr(at)cox.net
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PostPosted: Thu Feb 02, 2006 6:39 am    Post subject: Z-13/8 some questions Reply with quote

At 06:26 AM 2/1/2006 +0000, you wrote:

Quote:


I am trying to shoehorn my needs into a Z-13/8 and have some questions.

Our Europa has a Rotax 914 and want to use a ND alternator on the vacuum
pad as primary alternator with a LR3C regulator and use the internal
generator as Aux alternator. The battery will be between 12 and 18 amps
located aft of the motor and Main-Bus and E-Bus by 7 feet (~ 14 feet of
wire) run will be using #4 wire.

okay
Quote:
1) Will the LR3C be happy if I connect the #6 Bus to my Main Bus, or
should it really go closer to the battery?

#6 bus? are you talking about the suggested 6-slot fuseholder
as a BATTERY bus? This needs to mount right at the battery
contactor which is right next to the battery.
Quote:
2) Will the LR3C be happy if I connect the #3 OV sense wire to my Main
Bus, or should it really go closer to the battery?

Wire as shown in the diagrams.
Quote:
3) Rotax install manual wants difference between terminal C of the
regulator and the battery to be less than .2V, is this achievable with 12
feet of wire and a max load of 30 amps? What would happen if more than .2V
difference?

I believe "C" is the voltage regulation sense wire. They're
simply noting that voltage drops in ship's wiring can mis-inform
the regulator as to the exact status of votlage at the battery and
main bus. When wired with #4 as you've cited above, voltage
drops will be nominal for all considerations. Wire as shown in
the diagram.
Quote:
4)Rotax Install manual states" never sever connection between terminal C
and +B of regulator e.g. by removal of fuse"

Z-16 which is designed for only use of internal Rotax generator looks like
it disconnects C and +B, Z-13/8 which uses a SD8 as a aux alternator only
makes or breaks the output of SD-8.

The SD-8's regulator doesn't have a voltage sense wire . . .
Quote:
When using Rotax internal generator as Aux on Z-13/8 do I want to follow
Z-16 and sever, or follow Z-13/8 and leave C and +B connected and only
make and break output?

If there was a warning against separating C and +B on the original
version of Z-16 I did years ago, I don't recall it. You can simply
move the 22AWG "C" feed wire from "4" on the switch over to the
(+) terminal of the filter capacitor and treat the Rotax alternator/
regulator combo just like an SD-8.
Quote:
5) Rotax install manual recommends a 30 amp slow blow fuse on output of
regulator, is a 16AWG Fuselink as used in Z-16 equivalent to a 30 amp slow
blow fuse?

Yes.
Quote:
6) On Z-13/7 E-Bus has a 20 AWG Fuse-link,16AWG wire, switch and 7 amp
fuse: Z-32 Heavy Duty E-Bus Feed bumps up wire to 14AWG, a 10 amp fuse and a
relay instead of a switch

Quote:
a) For the 3 additional amp fuse, why did a relay replace switch?

The FAA's "rule of thumb" for protection limit on an always hot
wire in airplanes is 5A breaker. Frankly, I'd be more 'comfortable'
with a 5 or even 7A fuse . . . MUCH faster and less likely to provide a
high-energy fault in a crash. If you upsize the alternate feed from
the battery bus, conventional wisdom suggests a "mini" battery contactor
be co-located with the battery bus.

Quote:
b) Why was Fuse-link dropped?

Overkill . . . extremely low order probability of functioning
in a useful way.

Bob . . .


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