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  #1  
Old 09-28-2015, 02:34 AM
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High_Flyer High_Flyer is offline
 
Join Date: Sep 2010
Location: Saint-Jorioz, France.
Posts: 199
Default Current limiter and VP-X

Good morning,
I'm starting my electrical system (RV-7).
I'm installing a VP-X (plus a full Dynon panel).
I have seen that some builders are installing a current limiter on the firewall between the alternator and the VP-X. I can't see (or I missed it) anything in the VP-X manual about this.
I would have thought that the VP-X could handle all electrical malfunctions, including over-current.
It would be nice to have a few opinions on this.
Thank you.
Alain (in France).
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RV7 (F-PRVZ), Tip Up, Aerosport IO-375, Dynon Skyview, VP-X, Day VFR.

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  #2  
Old 09-28-2015, 05:30 AM
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Sylvainsting Sylvainsting is offline
 
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Location: In the center of France
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Default The same

I am in the same case. I would like to build a simple system, so if it is aredundant information...

Sylvain
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RV7 QB (F-PSED), Tip Up, Aerosport IO-375, James Cowl, WW 200RV, Dynon Skyview, VP-X sport, Day VFR,

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  #3  
Old 09-28-2015, 07:42 AM
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Default

The current limiter (a big fuse) isolates the alternator B lead from the battery in the event the B-lead is shorted (insulation cut, broken ring terminal, etc). Battery cable current does not pass through the VPX or a standard main bus; neither can serve the function of a B-lead current limiter.
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  #4  
Old 09-28-2015, 07:45 AM
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airmel airmel is offline
 
Join Date: Oct 2006
Location: SC
Posts: 156
Default See pages 26-27

Try pages 26-27 of the VP-X manual. There is an "ANL" fuse which is a current limiter for the alternator. It shows it going to the switched side of the battery contactor which is also wired to the power input of the VP-X. This protects the B-lead wiring. (The item not needed when using the VP-X is a shunt as the VP-X will provide this information without the need for a shunt.)
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  #5  
Old 09-28-2015, 10:52 AM
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High_Flyer High_Flyer is offline
 
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Location: Saint-Jorioz, France.
Posts: 199
Default Thanks

Yes I now see it on pages 26-27 of the VP-X manual.
Thank you very much.
Alain.
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Location: France
RV7 (F-PRVZ), Tip Up, Aerosport IO-375, Dynon Skyview, VP-X, Day VFR.

Flying since June 2017.
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