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cjhukill(at)cox.net
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 Posted: Sun Apr 25, 2010 7:27 am Post subject: diode to relay |
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I am wiring my RV10 with an avionics bus relay. I will activate the relay by switching the ground. I want to power the "activate power" lead with both the main bus and the avionics bus, as to allow a back door to the main bus thru the avionics bus, via the alternate ebus feed in the event of a failed master relay, in-flight. I need to know the rating and source for the diodes on the activate power leads. The small 50amp Bosch relay only draws .1 amp to close.
Chris Hukill
[quote][b]
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nuckolls.bob(at)aeroelect
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| Posted: Sun Apr 25, 2010 3:51 pm Post subject: diode to relay |
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At 10:20 AM 4/25/2010, you wrote:
| Quote: | | I am wiring my RV10 with an avionics bus relay. I will activate the relay by switching the ground. I want to power the "activate power" lead with both the main bus and the avionics bus, as to allow a back door to the main bus thru the avionics bus, via the alternate ebus feed in the event of a failed master relay, in-flight. I need to know the rating and source for the diodes on the activate power leads. The small 50amp Bosch relay only draws .1 amp to close. |
The coil spike suppression diodes are
the least critical application you'll need
to address. Any current rating at any voltage
you can find is electrically adequate to
the task. However, 1N400x or 1N540x series
devices are suggested as MECHANICALLY robust
and relatively easy to find. Take your pick
of these Radio Shack parts.
http://aeroelectric.com/Pictures/Misc/RS_Diodes.jpg
Bob . . . [quote][b]
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user9253
Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan
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| Posted: Mon Apr 26, 2010 4:27 am Post subject: Re: diode to relay |
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If I understand correctly, you want the option of being able to power the main bus through the avionics bus alternate feed. The avionics bus circuit would have to be able to handle the current requirements of both the Main and avionics bus circuits. If the avionics bus switch were inadvertently left on during engine start, part of the starting current would go through the avionics bus circuit, possibly overloading it.
Your plan is doable, as long as you are aware of the limitations.
Other options to accomplish your goal include using two master contactors in parallel or using a relay in parallel with the master contactor.
Joe
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Joe Gores |
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