Today's Message Index:
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1. 08:05 AM - Re: Re: Tailwind Electrical System Drawing and Power Analysis (Gerry van Dyk)
2. 09:19 AM - Re: Tailwind Electrical System Drawing and Power Analysis (user9253)
3. 09:58 AM - Re: Re: Tailwind Electrical System Drawing and Power Analysis (Gerry van Dyk)
4. 09:58 AM - Re: Re: Tailwind Electrical System Drawing and Power Analysis (Gerry van Dyk)
Message 1
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| Subject: | Re: Tailwind Electrical System Drawing and Power |
Analysis
Hello again all
Well, with the most recent comments from Joe and Peter, here's what I
believe may become the final configuration.
I will stipulate, I recognize this is a whole lot more system than the
airplane needs to fly, however I believe it will be required to have the
'VFR Only" limitation removed from my flight limitations. And as
pointed out by a fellow Canadian in a DM, the panel has been built with
the "visual field" requirements in the Canadian regs. Specifically
backup nav instruments have to be within 12" of pilots centerline, and
there must be an independent direction instrument. I'll have a basic
whiskey compass up on the dashboard, though I might have gotten away
with the dual ADAHRS units.
As I was revising the drawing this morning I had one of those forehead
slap moments. I thought I was being clever using a dpdt relay to run
both the aux alt and the e-bus. In fact, if the OV relay tripped, it
would have taken both items down leaving me with a dark panel. Joe's
suggestion of locating the e-bus relay near the battery forced a
separate relay, which now means when the OV crowbar takes down the aux
alt relay, the e-bus will now remain powered by the battery.
I'll still welcome any additional comments pointing out deficiencies,
however I think we might just have this dialed in now.
I hope I can pay the help forward that I've received here. Thanks to
everyone.
Cheers
Gerry
Message 2
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| Subject: | Re: Tailwind Electrical System Drawing and Power Analysis |
> however I think we might just have this dialed in now.
Not quite. :-)
The 15A circuit breaker below the overvoltage module is WAY to big. The
crowbar over-Voltage module might smoke before that circuit breaker pops.
The relay coil will draw much less than one amp. So the circuit breaker could
be rated at 1A, 3 amps maximum. Or maybe even use a 5 amp fuse.
.
The E-Bus relay will not work with positive connected to both ends of the relay
coil.
Connect terminal 5 of the E-Bus on-off switch to ground instead of to that 2A fuse.
.
Assuming that the E-Bus relay is located within 6 inches of the battery
bus, then connect them together with a fusible link. Eliminate the fusible
link on the right side of the relay. Doing that will eliminate one splice.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=512999#512999
Message 3
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| Subject: | Re: Tailwind Electrical System Drawing and Power |
Analysis
Thanks again Joe. I had already marked up the backup OV breaker to 5
amps, but you're quite right, on the much smaller alternator 1 or 2 amps
would be about right. It's a 5A breaker on the 60 amp alt.
On the E-bus relay, another of those 'facepalm' moments. I'm showing my
mechanical engineering side, and not thinking through electrical flow
properly. Gotta get better at that. ;^)
I had the thought of connecting the E-bus relay with the fuseable link,
but hadn't drawn it that way. the battery, b-bus and contactor are all
screwed down to one plate behind the seats, I'll bolt the relay there as
well. I'll set up a loop of fuselink to connect the relay, and we
should be good.
Thanks again, you're help is absolutely invaluable.
Gerry
------ Original Message ------
>From "user9253" <fransew@gmail.com>
To aeroelectric-list@matronics.com
Date 2023-12-31 10:18:45 AM
Subject AeroElectric-List: Re: Tailwind Electrical System Drawing and
Power Analysis
>
>
>> however I think we might just have this dialed in now.
>
>Not quite. :-)
>The 15A circuit breaker below the overvoltage module is WAY to big. The
>crowbar over-Voltage module might smoke before that circuit breaker pops.
>The relay coil will draw much less than one amp. So the circuit breaker could
>be rated at 1A, 3 amps maximum. Or maybe even use a 5 amp fuse.
>.
>The E-Bus relay will not work with positive connected to both ends of the relay
coil.
>Connect terminal 5 of the E-Bus on-off switch to ground instead of to that 2A
fuse.
>.
>Assuming that the E-Bus relay is located within 6 inches of the battery
>bus, then connect them together with a fusible link. Eliminate the fusible
>link on the right side of the relay. Doing that will eliminate one splice.
>
>--------
>Joe Gores
>
>
>Read this topic online here:
>
>http://forums.matronics.com/viewtopic.php?p=512999#512999
>
>
Message 4
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| Subject: | Re: Tailwind Electrical System Drawing and Power |
Analysis
Thanks again Joe. I had already marked up the backup OV breaker to 5
amps, but you're quite right, on the much smaller alternator 1 or 2 amps
would be about right. It's a 5A breaker on the 60 amp alt.
On the E-bus relay, another of those 'facepalm' moments. I'm showing my
mechanical engineering side, and not thinking through electrical flow
properly. Gotta get better at that. ;^)
I had the thought of connecting the E-bus relay with the fuseable link,
but hadn't drawn it that way. the battery, b-bus and contactor are all
screwed down to one plate behind the seats, I'll bolt the relay there as
well. I'll set up a loop of fuselink to connect the relay, and we
should be good.
Thanks again, you're help is absolutely invaluable.
Gerry
------ Original Message ------
>From "user9253" <fransew@gmail.com>
To aeroelectric-list@matronics.com
Date 2023-12-31 10:18:45 AM
Subject AeroElectric-List: Re: Tailwind Electrical System Drawing and
Power Analysis
>
>
>> however I think we might just have this dialed in now.
>
>Not quite. :-)
>The 15A circuit breaker below the overvoltage module is WAY to big. The
>crowbar over-Voltage module might smoke before that circuit breaker pops.
>The relay coil will draw much less than one amp. So the circuit breaker could
>be rated at 1A, 3 amps maximum. Or maybe even use a 5 amp fuse.
>.
>The E-Bus relay will not work with positive connected to both ends of the relay
coil.
>Connect terminal 5 of the E-Bus on-off switch to ground instead of to that 2A
fuse.
>.
>Assuming that the E-Bus relay is located within 6 inches of the battery
>bus, then connect them together with a fusible link. Eliminate the fusible
>link on the right side of the relay. Doing that will eliminate one splice.
>
>--------
>Joe Gores
>
>
>Read this topic online here:
>
>http://forums.matronics.com/viewtopic.php?p=512999#512999
>
>
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