[ARC5] A pair of questions

Craig cvcantwell at verizon.net
Tue Nov 14 10:44:19 EST 2017


Hey guys, I'm basing my load information off what I can find in the 
various manuals that I have, and giving myself some padding. The SCR-274 
book shows something around 15 amps for the configuration my airplane 
had. When you delve into the SCR-269 books, the info get really screwy. 
One book lists the input power as only .5 amps @ 24VDC, but when you 
look at the schematics, it has internal fuses of 20 or 35 amps for the 
inverters, depending on which one gets installed, if I'm understanding 
the drawings correctly. It also has another call out for either a 2 amp 
or 5 amp fuse for power in the same section of the book. What else is 
weird, is that the marker beacon receiver gets it's power from the -269 
and it draws about .5 amps itself.

Here is a quick run down on what has to be powered:
BC-696 Transmitter
BC-458 Transmitter
BC-453 Receiver
BC-454 Receiver
BC-455 Receiver
BC-456 Modulator
RC-43 Marker Beacon
RC-36 Interphone
SCR-269 Compass system

There are a total of 5 dynamotors and 1 inverter that power all this 
equipment. There are  (3) DM-32's, (1) DM-33, (1) PE-86 and (1) PE-89 or 
PE-109. There is one more big inverter that provides more 115/400cy and 
some 26/400cy power for other things onboard, but that isn't included, 
as it's a huge power hog (250 watts per phase). It's probably why each 
engine run a 100 amp generator.

I probably need to dig out the microfilm and chase down the wiring 
diagrams for the power panels, as they have breakers and fuses that 
range from 1 amp to 100 amps, all accessible from the cockpit, and I 
can't tell from what I have on the desk here, what goes with what circuit.

Craig


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