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Secondary alternator connection VPX-Pro

 
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bsiu(at)simpex.com
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PostPosted: Sat Sep 01, 2012 9:39 am    Post subject: Secondary alternator connection VPX-Pro Reply with quote

Hi all,

I have a philosophy question regarding circuit layout using the VPX Pro... I couldn’t find the answer through the archive search, so here’s my first post.

First, some background information:
I am at the planning stage of my electrical system. I am using a single battery (PC680), Primary Alternator (B&C L60) and Secondary Alternator (B&C SD-Cool. Per the VPX manual, it is recommended to connect both alternators to the SWITCHED side of the battery contactor. In addition, both alternators should be connected to a SPDT (on-off-on) switch (VXP 5.20 p.35 Alternator switch). In the event of a Pri Alt failure (e.g. OV), the VPX can sense that and turn off the power to the alternator and notification will show up on the EFIS. At that point, I can flip the switch to the Sec. alt. and continue to provide limited power for the essential bus as planned. Certainly a workable approach and it is a very nice power control system by the way.

On the other hand, per Nuckolls books Fig. 17-4, it is suggested that the SD-8 should be hooked directly to the battery (the UNSWITCHED side of the battery contactor) + adding a diode to the main bus to prevent the back flow of power to the main bus. Nuckolls’ approach is very nicely explained in his book. This will prevent a single point failure (i.e. the battery contactor or the VPX itself). But then you always hear others said, follow the manufacturer’s instructions…

I would like to hear your thoughts, comments, philosophies, ideas especially those who has installed similar power configuration as I have using the VPX. Thanks!

Bernie
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nuckolls.bob(at)aeroelect
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PostPosted: Sat Sep 01, 2012 1:26 pm    Post subject: Secondary alternator connection VPX-Pro Reply with quote

Quote:
But then you always hear others said, follow
the manufacturer’s instructions…


The architecture described in Z-13/8 is a three-layer system
that offers (1) Main alternator + Battery (2) Aux alternator +
battery with planned load shedding and (3) Battery only with
load shedding.

The system described in the VPX manual is more like Figure
Z-12 wherein you are offered (1A) Main alternator + Battery,
(1B) Aux alternator + Battery and (2) Battery only. Load shedding
is handled with a different control and management philosophy
which I presume is described in the system documentation.

Yes, if you are concerned about some feature that suggests
deviation from the manufacturer's recommendations, you really
need to take that up with the folks who did the system
architecture. But let us know how those conversations drive
your final decision.

Bob . . .


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