Today's Message Index:
----------------------
1. 04:53 AM - Re: Revmaster with EFIS (William)
2. 06:46 AM - RG-58 Coax at Aircraft Spruce (William Morelli)
3. 07:02 AM - Re: Revmaster with EFIS (user9253)
4. 11:44 AM - Re: Revmaster with EFIS (William)
5. 12:38 PM - Re: Revmaster with EFIS (user9253)
6. 05:03 PM - Re: Re: Revmaster with EFIS (John Morgensen)
7. 06:04 PM - Re: Re: Revmaster with EFIS ()
8. 07:04 PM - Re: Revmaster with EFIS (user9253)
9. 08:22 PM - 3PDT switch swap for relay? (Airdog77)
10. 08:54 PM - Re: 3PDT switch swap for relay? (Charlie England)
11. 09:16 PM - Re: 3PDT switch swap for relay? (Airdog77)
12. 10:35 PM - Re: 3PDT switch swap for relay? (Airdog77)
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| Subject: | Re: Revmaster with EFIS |
Here's an updated diagram.
It was stated that I don't need the O.V. protection.
Is that correct?
Thanks
Bill
Thatcher CX-5
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| Subject: | RG-58 Coax at Aircraft Spruce |
Aircraft Spruce offers two types of RG-58
One is PVC jacketed and the other says Non PVC.
They do not specify what the non PVC material is !!!!
Bill
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| Subject: | Re: Revmaster with EFIS |
I do not know how I missed it on your first schematic, but there are no switches
to control the alternator relays. Without switches, the relays serve no useful
purpose. The alternator output could be wired directly to the main power
bus. However, I recommend relays with control switches so that the pilot can
choose which alternator to use and so that the pilot can shut off all sources
of power in case of smoke in the cockpit.
There are pros and cons to over-voltage protection. I think that the majority
of small aircraft do not have it. It is one more thing that can fail. And
it has failed on rare occasions. On the other hand, voltage regulators can also
fail and cause the alternator to put too much voltage, which can destroy electrical
equipment. Avionics used to be made to operate at a certain voltage,
either 12 volts or 24 volts. But many modern avionics can operate anywhere from
10 up to 30 volts. In that case, over-voltage is not likely to damage them.
So, is over-voltage protection needed? No. But is it desirable? It is up
to the designer to decide. Van's Aircraft has not included over-voltage protection
in their RV-12. And there are over 500 of them flying and another 500
under construction.
I would reduce the size of the starter contactor coil fuse to 3 amps or 5 at
the most. My RV-12 has a 2 amp fuse for that coil circuit.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=466628#466628
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| Subject: | Re: Revmaster with EFIS |
Attempt #3
I put the switches on the relays and removed the warning lights.
Do the switched need to be 1A or just straight toggle?
Changed the starter to 3A.
The review is greatly appreciated.
On 2/25/2017 7:49 AM, William wrote:
> Here's an updated diagram.
>
> It was stated that I don't need the O.V. protection.
>
> Is that correct?
> Thanks
>
> Bill
> Thatcher CX-5
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| Subject: | Re: Revmaster with EFIS |
I do not see the alternator switches unless they are combination circuit breaker-switches.
The relay coils need diodes across them with the arrow (banded end) pointing towards
positive, just like on contactor coils. Diodes will protect switch contacts
from arcing.
Not sure what you mean by, "Do the switched need to be 1A or just straight toggle?"
Since you have decided not to install over-voltage protection, fuses can be used
instead of circuit breakers for a lot less money. Depending on the type of
relay, 1 amp should be adequate. But 3 amp could also be used.
VansAircraft sells fuses that glow (3 amp and above) when blown (provided that
the load has not opened). 3 amp part number: ES-00203
http://www.vansaircraft.com/public/parts.txt
Depending on the size of the starter motor and the distance from the battery, cable
smaller than 4 AWG might adequate. Ask Revmaster or someone with a similar
engine. If you have not purchased the capacitors yet, you might consider 35
volt instead of 25 volt.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=466638#466638
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| Subject: | Re: Revmaster with EFIS |
What happens to your Revmaster's ignition system during an over-voltage
event? Is it electrically dependent?
john
On 2/25/2017 5:49 AM, William wrote:
> Here's an updated diagram.
>
> It was stated that I don't need the O.V. protection.
>
> Is that correct?
>
> Thanks
>
> Bill
> Thatcher CX-5
Message 7
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| Subject: | Re: Revmaster with EFIS |
Joe (or anyone else),
Do you know what kind of fuse block Vans use on the RV-12? I like the
look of that, rather than CBs, and suspect it's cheaper. I looked
through the parts list, but came up empty - likely isn't called what I
think it is...
Jim Parker
-------- Original Message --------
Subject: AeroElectric-List: Re: Revmaster with EFIS
From: "user9253" <fransew@gmail.com>
I do not see the alternator switches unless they are combination circuit
breaker-switches.
The relay coils need diodes across them with the arrow (banded end)
pointing towards positive, just like on contactor coils. Diodes will
protect switch contacts from arcing.
Not sure what you mean by, "Do the switched need to be 1A or just
straight toggle?"
Since you have decided not to install over-voltage protection, fuses can
be used instead of circuit breakers for a lot less money. Depending on
the type of relay, 1 amp should be adequate. But 3 amp could also be
used.
VansAircraft sells fuses that glow (3 amp and above) when blown
(provided that the load has not opened). 3 amp part number: ES-00203
http://www.vansaircraft.com/public/parts.txt
Depending on the size of the starter motor and the distance from the
battery, cable smaller than 4 AWG might adequate. Ask Revmaster or
someone with a similar engine. If you have not purchased the capacitors
yet, you might consider 35 volt instead of 25 volt.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=466638#466638
Message 8
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| Subject: | Re: Revmaster with EFIS |
Van's has changed the design over time. The latest version is the
AV-50001 SWITCH & FUSE MODULE
Since it is a unique proprietary design, it is probably expensive.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=466655#466655
Message 9
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| Subject: | 3PDT switch swap for relay? |
Hi All,
I'm hoping to get some help in swapping out a 3PDT switch with a 3PDT relay.
Here's the background: I'm building a Long-EZ and there is a promising new electrical
scheme to drive the electrical nose gear actuator in canards. This new
wiring calls for replacing the old SPST (1-1, ON-OFF-ON) Nose Gear Up/Down switch
with a 3PDT ON-OFF-ON switch.
The problem for me is that I already have my current nose gear switch nicely configured
and installed in my throttle handle, and I really, really don't want
to swap it out. So, I was thinking I could swap out the newly required 3PDT switch
with a 3PDT relay.
However, with this being the gear switch, in my mind there's a problem in doing
this since there's that pesky "-OFF-" position on the switch, that to my knowledge
doesn't translate over to a "middle position" between N.O. and N.C. on a
relay. As you probably know, on canards we don't simply use a binary, all-the-way
up or down gear position (only for TO/landing ops), but use the gear switch
to position the nose in a myriad of heights off the ground when parked. Thus
I need to be able to hit the nose gear up/down position, have it run down
for a few seconds and then move the switch to the "OFF" position to stop the gear
from moving any forward.
I've attached a diagram to show what I'm talking about. Any help would be greatly
appreciated.
Thanks!
Wade
--------
Airdog
Wade Parton
Building Long-EZ 916WP
www.longezpush.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=466656#466656
Attachments:
http://forums.matronics.com//files/3pdtswitch_to_relay_swap_123.jpg
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| Subject: | Re: 3PDT switch swap for relay? |
On 2/25/2017 10:19 PM, Airdog77 wrote:
>
> Hi All,
>
> I'm hoping to get some help in swapping out a 3PDT switch with a 3PDT relay.
>
> Here's the background: I'm building a Long-EZ and there is a promising new electrical
scheme to drive the electrical nose gear actuator in canards. This new
wiring calls for replacing the old SPST (1-1, ON-OFF-ON) Nose Gear Up/Down
switch with a 3PDT ON-OFF-ON switch.
>
> The problem for me is that I already have my current nose gear switch nicely
configured and installed in my throttle handle, and I really, really don't want
to swap it out. So, I was thinking I could swap out the newly required 3PDT
switch with a 3PDT relay.
>
> However, with this being the gear switch, in my mind there's a problem in doing
this since there's that pesky "-OFF-" position on the switch, that to my knowledge
doesn't translate over to a "middle position" between N.O. and N.C. on
a relay. As you probably know, on canards we don't simply use a binary, all-the-way
up or down gear position (only for TO/landing ops), but use the gear switch
to position the nose in a myriad of heights off the ground when parked.
Thus I need to be able to hit the nose gear up/down position, have it run down
for a few seconds and then move the switch to the "OFF" position to stop the
gear from moving any forward.
>
> I've attached a diagram to show what I'm talking about. Any help would be greatly
appreciated.
>
> Thanks!
> Wade
>
> --------
> Airdog
> Wade Parton
> Building Long-EZ 916WP
> www.longezpush.com
>
How about 2 separate 3 pole relays? Both off with switch in center, one
or the other active with switch up or down.
Message 11
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| Subject: | Re: 3PDT switch swap for relay? |
Ok, I think I see how that would work to solve the center "off" dilemma. Now,
would it be more advisable to use two 3PST relays? Or does it matter at all?
Thanks!
Wade
--------
Airdog
Wade Parton
Building Long-EZ 916WP
www.longezpush.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=466658#466658
Message 12
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| Subject: | Re: 3PDT switch swap for relay? |
I'm pretty sure I got it! Thanks CE, you definitely got me thinking in the right
direction.
Because the new required 3PDT switch had 2 poles in one direction and one in the
other I was able to pare down the two 3PDT relays into a DPDT and an SPDT relay
set.
Attached is a diagram showing the implementation of these relays to allow me to
continue to use my SPST (1-1) ON-OFF-ON landing gear up/down switch as per my
original design.
Excellent.... thanks for the help!
Wade
--------
Airdog
Wade Parton
Building Long-EZ 916WP
www.longezpush.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=466659#466659
Attachments:
http://forums.matronics.com//files/3pdtswitch_to_relay_swapped_128.jpg
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