Today's Message Index:
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1. 06:46 AM - Alarm chirp with power on/off (hmanvel)
2. 05:12 PM - Relay Question: Adding control relay to SD-8 circuit (Airdog77)
3. 05:15 PM - Re: Starter Contactor location on a Long-EZ (Airdog77)
4. 07:25 PM - Re: Relay Question: Adding control relay to SD-8 circuit (user9253)
5. 08:59 PM - Re: Relay Question: Adding control relay to SD-8 circuit (Airdog77)
Message 1
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Subject: | Alarm chirp with power on/off |
I have been a stalker for many years and have not had a need to post a question
until now. My Rutan Defiant EAB has a simple master alarm circuit that uses
3 microswitches, throttle, canopy, and nosegear. If anything is in the wrong
position (canopy open with throttle, gear up with throttle back) an obnoxious
108 db alarm buzzes. Here's my problem; lately when I turn on the master, I hear
the alarm chirp very briefly. And again when I turn off the master. I have
checked all wiring connections, grounds etc. and cannot find anything wrong.
Any thoughts on where to look next? Could a failing microswitch somehow cause
this?
--------
Harry Manvel
Defiant N2HM
PTK / Pontiac, MI
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=477792#477792
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Subject: | Relay Question: Adding control relay to SD-8 circuit |
Bob, et al.
Another question for the gang. I have the B&C SD-8 alternator wired into my Z-13/8
architecture pretty much how shown in the AEC diagram.
My question is regarding a control relay that I would like to add into the SD-8
circuit to essentially facilitate an "IF-THEN" statement... so that IF the AUX
ALT off/on switch for the SD-8 is flipped to "ON" THEN the coil of this added
relay is powered up and another circuit elsewhere is broken.
My thought was to simply extend the wire that would normally go to ground from
the AUX ALT off/on switch to one side of this control relay's coil, then to ground
from the other side of this control relay's coil. This circuit would be
easiest by far in my wiring scheme, but although it will work, I'm not sure if
it's the best way to do this. In essence I would have power>>relay coil>>switch>>relay
coil>>ground.
Am I violating any (more ;)) rules by doing this?
Regards,
Wade
--------
Airdog
Wade Parton
Building Long-EZ N916WP
www.longezpush.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=477797#477797
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Subject: | Re: Starter Contactor location on a Long-EZ |
Thanks Bob!
--------
Airdog
Wade Parton
Building Long-EZ N916WP
www.longezpush.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=477798#477798
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Subject: | Re: Relay Question: Adding control relay to SD-8 circuit |
It is not clear if your plan will break a rule or not without seeing a schematic
of the circuit. There is a saying that applies. If it is not installed, it
can not fail.
There are couple of ways to break an unrelated circuit when you operate a switch.
One way is to use a DPDT switch. One half of the switch makes a circuit
and the other half of the switch breaks a different circuit. The same thing
can be accomplished using a DPDT relay to control the aux alternator and the new
intended circuit. There is no need to use two relays.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=477802#477802
Message 5
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Subject: | Re: Relay Question: Adding control relay to SD-8 circuit |
Joe,
Thanks for your response.
I attached a diagram of the SD-8 installed in the Z-13/8 with my proposed control
relay added.
I understand using a different switch, I strongly considered it, but in this situation
I would greatly prefer not to for a variety of reasons: I don't want to
add another wire run if I can avoid it. Moreover, I'm in a Long-EZ, which adds
a number of different challenges to this endeavor, including INCREDIBLE tight
tolerances on my panel where this switch is located. Plus, my SD-8 is in
the very back of the aircraft, my switch is on the panel, and my control relay
needs to be in the very nose of the aircraft.
This is also why I didn't simply want to bump up the current SD-8's S704-1 relay
to a DPDT relay. So I have evaluated and scrutinized this circuit and if I
can do this the way I'm presenting it, it looks to me as if this would be the
cleanest install for my current configuration. There may be an easier way, but
right now I'm looking at extending one wire, moving a ground and adding a relay
to open one circuit when the SD-8 is turned on.
Regards,
Wade
--------
Airdog
Wade Parton
Building Long-EZ N916WP
www.longezpush.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=477803#477803
Attachments:
http://forums.matronics.com//files/sd_8_added_control_relay_222.jpg
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