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SD8 Alternator Install - Z-12 vs. Manual

 
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sjhdcl(at)kingston.net
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PostPosted: Sun Feb 19, 2006 3:18 pm    Post subject: SD8 Alternator Install - Z-12 vs. Manual Reply with quote

I comparing the SD8 install manual to Z-12 and I'm a bit confused of why the
wiring difference.

The install manual (Drawing 504-500 from B&C) details the following:
1. Aux Alt field breaker connected to main power bus via 2A breaker
and aux alt switch then on to yellow OV crowbar module wire and onto 20 amp
relay.
2. Install manual shows alt warning light coming off of relay
3. Install manual shows a second power connection via 10A breaker to
main bus
Z-13 details
1. Aux alt field connected breaker connected to 20Amp relay then onto
aux alt switch. Black wire of OV module is connected to relay.
2. Z-13 does not show any aux alt warning light
3. Z-13 shows 16Awg fuselink coming from Battery contactor

There are more differences but can someone recommend which diagram to follow
and the reasoning for the differences.

When does the warning light come on for the aux alt? Some instructions say
the alt light comes on when the aux alt switch is off or it is OV.

I plan on leaving the aux alt switch off all the time. Some have
recommended to leave it on but in this scenario how does one diagnose a
failed main alt if the backup alt has the ability to absorb all of the load?

I'm also running a B&C 60 Amp alt with LR3 reg.

Thanks for some clarification,

Steve
RV7A


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nuckollsr(at)cox.net
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PostPosted: Thu Feb 23, 2006 8:14 am    Post subject: SD8 Alternator Install - Z-12 vs. Manual Reply with quote

At 05:36 PM 2/19/2006 -0500, you wrote:

Quote:

<sjhdcl(at)kingston.net>

I comparing the SD8 install manual to Z-12 and I'm a bit confused of why the
wiring difference.

The install manual (Drawing 504-500 from B&C) details the following:
1. Aux Alt field breaker connected to main power bus via 2A breaker
and aux alt switch then on to yellow OV crowbar module wire and onto 20 amp
relay.
2. Install manual shows alt warning light coming off of relay
3. Install manual shows a second power connection via 10A breaker to
main bus
Z-13 details
1. Aux alt field connected breaker connected to 20Amp relay then onto
aux alt switch. Black wire of OV module is connected to relay.
2. Z-13 does not show any aux alt warning light
3. Z-13 shows 16Awg fuselink coming from Battery contactor

There are more differences but can someone recommend which diagram to follow
and the reasoning for the differences.

First, keep in mind that you're comparing two different architectures.
You're trying to blend the difference between a pickup truck and a
sedan.


Quote:
When does the warning light come on for the aux alt? Some instructions say
the alt light comes on when the aux alt switch is off or it is OV.

I plan on leaving the aux alt switch off all the time. Some have
recommended to leave it on but in this scenario how does one diagnose a
failed main alt if the backup alt has the ability to absorb all of the load?

I'm also running a B&C 60 Amp alt with LR3 reg.

Thanks for some clarification,

Start with tossing out the B&C papers that show you how to
wire up the SD-8 as the only power generating source for
an airplane.

Figure Z-13/8 does not have a warning light for the SD-8
because it's the standby alternator and you don't want
a warning light starring you in the face for 99.9% of your
flight where the SD-8 is never used.

Yes, the SD-8 is left off all times the 60A machine is
running. The LV warning in the LR-3 is to tell you when
you need the SD-8. Under max endurance operations SD-8
only, there are no warnings . . . you already KNOW that
your operating with limited capabilities so you'll have
to watch a voltmeter -OR- install LV warning on the
e-bus but this would be a bit of over kill.

Bob . . .


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sjhdcl(at)kingston.net
Guest





PostPosted: Fri Feb 24, 2006 7:22 am    Post subject: SD8 Alternator Install - Z-12 vs. Manual Reply with quote

I thought the point in having the warning light for the aux alternator is
tell you it is overloaded and
equipment needs to be turned off??

Steve
RV7A

Quote:
Time: 08:14:15 AM PST US
From: "Robert L. Nuckolls, III" <nuckollsr(at)cox.net>
Subject: Re: SD8 Alternator Install - Z-12 vs. Manual


<nuckollsr(at)cox.net>

Quote:

At 05:36 PM 2/19/2006 -0500, you wrote:

>
><sjhdcl(at)kingston.net>
>
>I comparing the SD8 install manual to Z-12 and I'm a bit confused of why
the

Quote:
>wiring difference.
>
>The install manual (Drawing 504-500 from B&C) details the following:
> 1. Aux Alt field breaker connected to main power bus via 2A
breaker

Quote:
>and aux alt switch then on to yellow OV crowbar module wire and onto 20
amp

Quote:
>relay.
> 2. Install manual shows alt warning light coming off of relay
> 3. Install manual shows a second power connection via 10A breaker
to

Quote:
>main bus
>
>
>Z-13 details
> 1. Aux alt field connected breaker connected to 20Amp relay then
onto

Quote:
>aux alt switch. Black wire of OV module is connected to relay.
> 2. Z-13 does not show any aux alt warning light
> 3. Z-13 shows 16Awg fuselink coming from Battery contactor
>
>There are more differences but can someone recommend which diagram to
follow

Quote:
>and the reasoning for the differences.

First, keep in mind that you're comparing two different architectures.
You're trying to blend the difference between a pickup truck and a
sedan.


>When does the warning light come on for the aux alt? Some instructions
say

Quote:
>the alt light comes on when the aux alt switch is off or it is OV.
>
>I plan on leaving the aux alt switch off all the time. Some have
>recommended to leave it on but in this scenario how does one diagnose a
>failed main alt if the backup alt has the ability to absorb all of the
load?

Quote:
>
>I'm also running a B&C 60 Amp alt with LR3 reg.
>
>Thanks for some clarification,

Start with tossing out the B&C papers that show you how to
wire up the SD-8 as the only power generating source for
an airplane.

Figure Z-13/8 does not have a warning light for the SD-8
because it's the standby alternator and you don't want
a warning light starring you in the face for 99.9% of your
flight where the SD-8 is never used.

Yes, the SD-8 is left off all times the 60A machine is
running. The LV warning in the LR-3 is to tell you when
you need the SD-8. Under max endurance operations SD-8
only, there are no warnings . . . you already KNOW that
your operating with limited capabilities so you'll have
to watch a voltmeter -OR- install LV warning on the
e-bus but this would be a bit of over kill.

Bob . . .


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