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  #11  
Old 08-10-2018, 10:43 PM
PNLBLDR PNLBLDR is offline
 
Join Date: Aug 2014
Location: Minnesota
Posts: 14
Default Acc block

Hi Justin,

Why not run your fuse block off the main vpx lug, and not out of a power pin? Just bypass the VPX entirely for the items on fuses..
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  #12  
Old 08-11-2018, 07:33 AM
AviatorJ AviatorJ is offline
 
Join Date: Feb 2015
Location: Oklahoma City
Posts: 669
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Quote:
Originally Posted by OGee View Post
Looking for comments regarding my IBBS - VPX wiring diagram. Will it work? Is there a better way? Thanks.

https://drive.google.com/file/d/19kc...ew?usp=sharing
I struggled with the want/need to hang the GPS and/or a Comm off the IBBS. In the end I went with the standard TCW drawing showing just the PFD/MFD/ADAHRS/EIS hanging off it, keeping it under the 10 amp fuse size of the battery.

Quote:
Originally Posted by PNLBLDR View Post
Hi Justin,

Why not run your fuse block off the main vpx lug, and not out of a power pin? Just bypass the VPX entirely for the items on fuses..
Hey Nick. I have a 60 amp ANL between the contactor and the VPX. So my concern would be blowing that out if I hang too much stuff off the power lug. My solution was to basically remove my two USB chargers from the accessory block and bumping it down to 5a. Here's the latest planner-

http://planner.verticalpower.com/printable/share/2722

I am however going to hang some stuff off the input side of the ANL such as the AC compressor, AC evaporator, airhorn and maybe the USB Chargers. I also am going to go ahead and put two shunts in since the harness you guys made already has those leads. Don't want them going to waste, so that will give me a better picture along with the VPX of power being used.
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RV-10 Quickbuild 'Avionics and Interior'
http://operationrv10.blogspot.com/
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  #13  
Old 08-11-2018, 08:25 AM
OGee OGee is offline
 
Join Date: Jul 2012
Location: Lakeway, TX
Posts: 16
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Quote:
Originally Posted by PNLBLDR View Post
Hi Justin,

Why not run your fuse block off the main vpx lug, and not out of a power pin? Just bypass the VPX entirely for the items on fuses..
Want an on/off avionics switch. By running through the VPX I can configure all avionics (excepting main power for the MFD) to a switch. The power pins for the IBBS will be part of the configuration. Seems I have a bit more flexibility through the VPX.
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OldGuy
N58TX RV-8 QB
Avionivs
Prior, 1955 C-170B.
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  #14  
Old 08-13-2018, 08:31 AM
OGee OGee is offline
 
Join Date: Jul 2012
Location: Lakeway, TX
Posts: 16
Default IBBS Voltage to VPX

Running pin 2 (Batt Info) from IBBS to J2 pin 12 (Aux Batt Volt) on the VPX. IBBS says to in stall a 100k Ohm resistor. VPX says to install a 1k Ohm resistor. Has anyone done this? If so, which resistor did you use?
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N58TX RV-8 QB
Avionivs
Prior, 1955 C-170B.
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  #15  
Old 08-13-2018, 09:40 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 1,661
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Quote:
Originally Posted by OGee View Post
Want an on/off avionics switch. By running through the VPX I can configure all avionics (excepting main power for the MFD) to a switch. The power pins for the IBBS will be part of the configuration. Seems I have a bit more flexibility through the VPX.
Does this mean you have the VPX and an Avionics Master switch in series? If so, does this translate to two potential single point failure components in series?

I never design in an Avionics Master switch and perhaps I just donít understand VPX. If so, sorry for my stupid question.

Carl
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  #16  
Old 08-13-2018, 09:57 AM
OGee OGee is offline
 
Join Date: Jul 2012
Location: Lakeway, TX
Posts: 16
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Quote:
Originally Posted by Carl Froehlich View Post
Does this mean you have the VPX and an Avionics Master switch in series? If so, does this translate to two potential single point failure components in series?

I never design in an Avionics Master switch and perhaps I just donít understand VPX. If so, sorry for my stupid question.

Carl
VPX actually does the component switching.
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N58TX RV-8 QB
Avionivs
Prior, 1955 C-170B.
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  #17  
Old 08-13-2018, 11:21 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
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Quote:
Originally Posted by OGee View Post
VPX actually does the component switching.
So if either the physical avionics switch connected to the VPX, or the VPX itself failed you still have avionics?
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  #18  
Old 08-13-2018, 12:59 PM
AviatorJ AviatorJ is offline
 
Join Date: Feb 2015
Location: Oklahoma City
Posts: 669
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Quote:
Originally Posted by Carl Froehlich View Post
So if either the physical avionics switch connected to the VPX, or the VPX itself failed you still have avionics?
Can't speak for 'OldGuy', but in my case I would have to flip the back up battery switch to power my two G3X screens, EIS and ADAHRS... now if all that takes a dive then I have my G5.
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RV-10 Quickbuild 'Avionics and Interior'
http://operationrv10.blogspot.com/
Donated for 2018
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  #19  
Old 08-15-2018, 08:47 AM
OGee OGee is offline
 
Join Date: Jul 2012
Location: Lakeway, TX
Posts: 16
Default IBBS VPX

Quote:
Originally Posted by Carl Froehlich View Post
So if either the physical avionics switch connected to the VPX, or the VPX itself failed you still have avionics?
Yes. Hereís the rationale: After engine start I flip the Avionics/IBBS Enable switch (DPDT). I then check the IBBS voltage on the MFD to verify the IBBS is fully charged. Letís assume the IBBS is fully charged and I am flying. At this point if the IBBS Enable switch has a disconnect it will disable the IBBS. However, the avionics connected to the IBBS continue to function since the IBBS is not the source of power. It is a pass-through portal for the power, the actual source for which is the VPX. Now if the VPX does a Lewinsky the IBBS will sense the voltage drop (under 11 volts) and provide power to the connected devices. So, as I see it the only avenue of failure is to have both the IBBS and the VPX go TU, which i consider highly unlikely?
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