I have dual pmags and fuel injection and am using Bob Nuckols Z-13/8 architecture with main bus, E-bus and battery bus. What bus is appropriate for the pmags and why? What bus is appropriate for the fuel boos pump and why?
thanks
thanks
I have dual pmags and fuel injection and am using Bob Nuckols Z-13/8 architecture with main bus, E-bus and battery bus. What bus is appropriate for the pmags and why?
What bus is appropriate for the fuel boost pump and why?
I run the Pmags off the main buss. So only on ship's power once the master is turned on. This allows dedicated circuit breakers on the panel for maintenance purposes and MAYBE a one-time reset in flight if over inhospitable terrain. They don't absolutely need to powered from ship's power when operating in "ALT out" (running on backup ALT) conditions with the Ebuss in use because they are NOT drawing anything from ships power anyway at that point. I didn't want my Ebuss items powered up for engine start shut down so the Pmags are not on the Ebuss.
The boost pump is not a continuous duty item and is high draw. So this would not be on the Ebuss since it would have to be off anyway (for Ebuss ops). Since my Ebuss is off for engine start/shut down, and the fact that boost pump may be required for cold engine starts, the boost pump is on the main buss.
Ground each P-mag to a separate engine case bolt, power them with separate pullable breakers, and provide a way to drop power to each P-mag independently (pullable breakers will do) so you can test the internal generator as a pre-flight check.
I have fuses, but my switches do allow for easy, independent testing of the self powering feature.
Thanks
Some pmags normally run on ships power and some on self power but I don't see what that has to do with which bus is used.
Pmags are self powered above a certain RPM.