Re: 915iS Wiring Questions
Check out PPS from vertical power. I would of incorporated it into my build if it was out when I built. Sorry can’t answer most of your questions, but a few just went down the road your starting and they can chime in. I do know that you can connect the canbus to the 915 ecu, just not sure what sensors you can see as I am also interested. Someone should post a screen shot of what they are getting? Can you see intake temps(manifold temp) EGTs, cht’s?
Re: 915iS Wiring Questions
Quote:
Originally Posted by
Shadowrider
Check out PPS from vertical power. I would of incorporated it into my build if it was out when I built. Sorry can’t answer most of your questions, but a few just went down the road your starting and they can chime in. I do know that you can connect the canbus to the 915 ecu, just not sure what sensors you can see as I am also interested. Someone should post a screen shot of what they are getting? Can you see intake temps(manifold temp) EGTs, cht’s?
I actually had the PPS in my design but removed it. The PPS replaces the high-current relays like the starter and mains and simplifies
alternator wiring but I think that most of that is already provided by the 915iS electronics. The only thing the PPS offered that
was left were shunts and those are cheap to buy. The PPS costs $1700 and since my budget is somewhat blown by deciding on
the 915iS it did not make sense to include it anymore. Since I live close to KF I should probably pay a visit and see how they wire
up the 915iS.
Considering the cost it would be nice if the installation document was more clear.
Victor
Re: 915iS Wiring Questions
I hear you. Wish kitfox would update instructions and make a few videos for clarification. FYI you don’t need a shunt with the VPX. It knows amp draw of everything going out and totals them to give you total amp draw.
Re: 915iS Wiring Questions
Hello Victor
I am in the exact same spot as you. My 7SS is about ready for fuselage cover and I am already planning the next step - avionics.
I also plan a 915is with a VPX. I will be using GRT avionics instead of Garmin. I am not an electrical engineer, but do have some fundamental knowledge of circuitry.
I agree that the 915is install manual leaves a lot to be desired. The sections that I found most useful are 24, 76, and 77, but you likely know that already.
I have been through the VPX manual several times (haven't bought the actual unit yet) and have some ideas about how I want to configure things. The manual is mostly complete, but requires a lot of digging to find what you are looking for.
Perhaps we can chat off line. If you send me a PM with contact info, would like to talk. We can, of course, post our findings here to benefit other forum members.
Thanks
Fred
Re: 915iS Wiring Questions
Yes the install manual sucks. I am swapping out my ULS for the 912 iS now! As to your question on the fuse box....you do not have a field wire on these alternators, they are permanent magnet generators so they max out at rpm, any extra current is shunted to ground. Because they max out I made a large heat sink for the "B" regulator as it puts out around 33 amps and a lot of heat. The "A" regulator is only 16 amps and handles it OK. And yes Rotax has an automatic overvoltage protection on these voltage regulators...once the wires burn thru it usually stops producing current.
Re: 915iS Wiring Questions
Quote:
Originally Posted by
jrd
Yes the install manual sucks. I am swapping out my ULS for the 912 iS now! As to your question on the fuse box....you do not have a field wire on these alternators, they are permanent magnet generators so they max out at rpm, any extra current is shunted to ground. Because they max out I made a large heat sink for the "B" regulator as it puts out around 33 amps and a lot of heat. The "A" regulator is only 16 amps and handles it OK. And yes Rotax has an automatic overvoltage protection on these voltage regulators...once the wires burn thru it usually stops producing current.
Thanks for the info. It would be nice to capture all the stuff we've learned so that others can use it in the future.
Victor