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On my plane, I used an audio mixer with a DPDT toggle to bypass. Other options are a relay, or second set of comm jacks. Paige |
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Yes, the big diode can handle that. Neat thing about the GTR 200 is in one of the setup screens it'll show you how manny amps it's drawing, 3.5A is the most I've seen from it. Now with the GDU/GAD/GEA on the Emer bus and without the avionics bus on, yes It could be close to 10A. In normal operation though, the avionics bus voltage will be slightly higher (due to the schotty diode on the Emer bus) and with the internal diodes on the G3X components they should use the higher voltage input, leaving the Emer bus to just power the GTR 200. Jon |
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I personally don't like the systems where you have to turn one mag off to get the starter to work, I don't think I'd remeber to do that under duress. |
25 ohm resistor
Don't understand the purpose of the 25 ohm resistor? Even if it is a 2.5 ohm resistor, it doesn't make sense. Under high current draw, it will get hot (if it is 2.5) and if it is 25, then it will limit the battery charging as mentioned before.
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Also, the only current going through the resistor is for charging the aux battery. The bus current only "sees" one diode and goes straight to the emer bus. Jon |
The aux battery charging current depends on the battery voltage. If the battery voltage is say 10 volts, then 14.5V minus 10V = 4.5 volts dropped across the resistor. 4.5V x 4.5V divided by 2.5 ohms = 8 watts that the resistor needs to dissipate. The battery voltage would have to be less than 3.3 volts before the wattage rating of the 50 watt resistor would be exceeded. No worry about the resistor getting hot.
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Don't understand why the emergency battery would be much different voltage than the main battery since it would be charging all the time (when engine running) like the main battery. The main battery doesn't use a current limiting resistor so why should the backup? I would take out the one diode and resistor on the emergency battery ... don't think it is needed. With that said, it won't hurt anything to leave it in either.
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What are the pyro devices?
Dave |
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Using a current limiting resistor on small backup batteries isn't new. You can search the archives. I believe Brantel, Walt, and perhaps Ironflight have used similar systems. Paige |
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