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In other words, in the event of an in-flight alternator failure, is the GAD27's conditioned power output appropriate for keeping critical electronics at +12V for an extended duration or is it only suitable for momentary low-voltage conditions? |
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The conditioned power output from the GAD 27 is only suitable for brief low-voltage conditions such as seen when starting the engine. It is not a replacement for any required backup battery. Most customers will use one or the other, but not both. Thanks, Steve |
Perfect. That really helps!
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Using both GAD 27 & IBBS
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Just an idea for your consideration. |
Dave,
I?m curious, with no backup power pin on the GTN, how did you connect the GTN to the IBBS? Did you use TCW?s wiring and utilize the passthru? |
No, I want the TCW IBBS to be a truly separate source (i.e. if the pass thru fails, the avionics will still receive power from the normal electrical system.) I isolated the 2 different power supplies by installing a diode in each source lead just ahead of the power input to the GTN 650. I used relatively large SR1045-TP Schottky 45V 10A R6 diodes from DigiKey (P/N SR1045-TPMSCT-ND). I did the same for one other supply, I think it was the GTR 200R radio (don't have my wiring diagrams in front of me to confirm).
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Thx for the info Dave. Besides the PFD 460, GSU 25, and GEA24.....I'm contemplating placing my GTN 625 and GAD 29 on the IBBS as well. But I also want the IBBS to be a separate system. I'm not sure how to do the diode thing for secondary power...do you mind sharing what you did in case I go that route?
I also like having only those three key items on the IBBS as it would surely power those items for maybe 2 hours |
Ed,
If you will send me your email address via Private Message on this board, I will email you a page from my wiring diagrams that shows where to place the diodes for isolation between the 2 power systems. Think of a diode like a check valve - current will only flow through the diode in one direction. The diode blocks power back-flow should one of the 2 power circuits become shorted to ground or go off-line. |
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Ray Allen Position Sensor
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The GEA 24 will provide 5V to each Ray Allen unit individually. There are drawings for this specific interface on page 30-6 of the AL revision of the G3X Touch Installation Manual. Thanks, Justin |
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