Quote:
Originally Posted by avrojockey
So I just finished up the mod to my ND internal regulated supplied by Vans, but I took a slightly different approach...I only accomplished part of the mod (turning the IG terminal into the sole F (field) supply) and left the alternator internally regulated. Here's why I went this route...
- My main concern was OV protection and the ability to positively turn off the field
- I didn't want modifications outside of the alternator...this would allow me to locally source an alternator which would be plug-in-play
- With proper blast cooling I can mitigate failures of the regulator and rectifier.
- The ability to do this with materials I already had...I only needed to purchase a 50 cent diode but I also replaced the brushes for $10 while I had things apart.
- I didn't see the need to have an external regulator, nor have a contactor for the B+ output.
I followed the instructions from AeroConnection here:
http://www.aeroelectric.com/articles...rnator_Mod.pdf
The directions are pretty good and go into explaining why one should make this mod. I only deviated from the directions in that I used my already installed alternator and B&C OV module.
Just reinstalled this afternoon to test, and putting out precisely 14.2V under various loads with positive control from the ALT switch and field breaker. I now feel a little better about dispatching in hard IMC in my all-electric airplane. |
I wrote those instructions 12 years ago after I performed that mod on my own alternator (and then sent to Bob, who published it). That same alternator is still performing well after 800+ hours. One of these days, I'll buy another alternator and do a better job of step-by-step photos.
Cool thing about this mod is you can do it to a spare regulator and brush holder and keep that in the airplane for field repair. You don't even have to remove the alternator from the airplane to change out those parts.
Linear Mode
