[ARC5] A pair of questions

[Bob Camp]

Hi

One very simple question:

Are you going to turn everything on with one switch? Put another way, do
all the dynamotors spin up at the same time? Anything you can do to spread
out the starting process will have a big impact on the surge current.

Bob

> On Nov 14, 2017, at 10:44 AM, Craig <cvcantwell at verizon.net> wrote:
> 
> 
> 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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