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nuckolls.bob(at)aeroelect
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 Posted: Thu Dec 12, 2019 4:31 am Post subject: Flap relay (!!!CORRECTION!!!) |
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At 12:49 PM 12/11/2019, you wrote:
Does anyone have experience with the Aircraft Extras relay board? I am considering two flap switches on my panel (Zenith STOL 750), one for pilot and one for instructor, which would require a relay deck to interface to the flap motor. The motor has a full-stall draw of 4A, so it is way beyond the 1A rating of the Ray Allen relay deck. The Aircraft Extras unit is rated at 10A so that should not be a problem, but I was wondering if they have a good track record for reliability, ease of installation, etc.
Buy a couple of these:
https://tinyurl.com/u2yld6d
wire them like this:
Corrected bad link from previous posting . . .
http://www.aeroelectric.com/PPS/Flight/Flaps/Flaps%208.pdf
Inexpensive, works good, lasts a long time
Bob . . .
Bob . . .
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roughleg(at)gmail.com
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| Posted: Thu Dec 12, 2019 7:54 am Post subject: Flap relay (!!!CORRECTION!!!) |
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Thanks for the revised drawing Bob. I hadn't thought of diodes, but that makes sense for the flap motor. Do you think diodes would be necessary for a (much smaller) RAC trim motor?
As it happens, the relay you linked to on eBay is now back in stock...
On Thu, Dec 12, 2019 at 6:21 AM Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
| Quote: | At 12:49 PM 12/11/2019, you wrote:
Does anyone have experience with the Aircraft Extras relay board? I am considering two flap switches on my panel (Zenith STOL 750), one for pilot and one for instructor, which would require a relay deck to interface to the flap motor. The motor has a full-stall draw of 4A, so it is way beyond the 1A rating of the Ray Allen relay deck. The Aircraft Extras unit is rated at 10A so that should not be a problem, but I was wondering if they have a good track record for reliability, ease of installation, etc.
Buy a couple of these:
https://tinyurl.com/u2yld6d
wire them like this:
Corrected bad link from previous posting . . .
http://www.aeroelectric.com/PPS/Flight/Flaps/Flaps%208.pdf
Inexpensive, works good, lasts a long time
Bob . . .
Bob . . .
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nuckolls.bob(at)aeroelect
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| Posted: Thu Dec 12, 2019 8:14 am Post subject: Flap relay (!!!CORRECTION!!!) |
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At 09:52 AM 12/12/2019, you wrote:
| Quote: | Thanks for the revised drawing Bob. I hadn't thought of diodes, but that makes sense for the flap motor. Do you think diodes would be necessary for a (much smaller) RAC trim motor?
As it happens, the relay you linked to on eBay is now back in stock... |
The diodes have nothing to do with the motor . . .
the diodes clamp off inductive de-energizing spikes
from the relay coils.
Check out this library of articles on the topic:
https://tinyurl.com/rw2juw8
Bob . . .
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