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gerry.vandyk(at)eastlink.
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 Posted: Sat Dec 30, 2023 5:00 am Post subject: Re[3]: Tailwind Electrical System Drawing and Power Analysi |
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Thanks for the notes Joe
Replace the 15A E-Bus fuse with a fusible link. It is not good practice to have fuses in series.
Yep, makes good sense.
Locate the E-Bus relay near the battery bus.
I plan to locate the SD-8 regulator between the panel and firewall. The battery and it's bus are behind the passenger seat. My plan is to replace the relay that came in the alternator kit with a double pole relay, and place it beside the regulator. I suppose I could have the switch operate two separate relays, but that seems pretty clunky. Could you please tell me what problem you see with the relay beside the endurance bus rather than the battery bus?
In the event of over voltage, the crowbar module will smoke. Protect it with a 3 amp fuse or circuit breaker.
This confused me for a while till I realized I've got the breaker in the wrong position. I need to have the breaker in the switch wire, not the alternator feed line back to the battery bus. I'll correct this. B&C's wiring drawing is calling for a 2 amp breaker.
The 2A fuse in the battery contactor coil circuit is a good idea. It will protect against reversed battery polarity. (It happens)
It'll be a long wire making its way from the contactor, up between the seats, through the tunnel with the flap linkages, then up to the panel, so fusing it is a no-brainer. ;^)
Consider using a Hall Effect sensor instead of a shunt, if compatible with your Dynon.
Yes, the EMS-220 from Dynon is compatible with hall effect sensors. The engine sensor kit came with the shunt so I'll use it till I find a need to change it. Don't get me wrong, I like hall effect sensors, but I'm too cheap to set aside something that works and buy something different. ;^)
The starter contactor diode is wired wrong. Connect the banded end to the "S" terminal.
Connect the other end of the diode to the other end of the contactor coil (ground).
I'm a little red-faced on this one. When I added it, I first had it wired as you say, then a quick glance at the battery contactor made me think it goes on those two contacts on the side. So I changed it. Doh!!! I'll put it back right. Of course it needs to be across the coil.
Thanks again Joe, I'll get these corrections made.
Gerry
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Sat Dec 30, 2023 9:16 am Post subject: Re: Re[3]: Tailwind Electrical System Drawing and Power Ana |
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| Quote: | | Could you please tell me what problem you see with the relay beside the endurance bus rather than the battery bus? |
The pilot should have the ability to shut off all electrical power as close to the source(s) as possible.
This is especially important in the event of smoke in the cockpit or an imminent forced landing.
Avoid installing always-hot wires any distance from the battery, especially near the engine.
A NTSB accident inspector once commented that fires are unlikely if the battery is thrown clear of the wreckage.
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