---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 02/03/18: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 06:46:05 AM PST US Subject: AeroElectric-List: Alarm chirp with power on/off From: "hmanvel" 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 ________________________________ Message 2 _____________________________________ Time: 05:12:54 PM PST US Subject: AeroElectric-List: Relay Question: Adding control relay to SD-8 circuit From: "Airdog77" 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 ________________________________ Message 3 _____________________________________ Time: 05:15:20 PM PST US Subject: AeroElectric-List: Re: Starter Contactor location on a Long-EZ From: "Airdog77" 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 ________________________________ Message 4 _____________________________________ Time: 07:25:44 PM PST US Subject: AeroElectric-List: Re: Relay Question: Adding control relay to SD-8 circuit From: "user9253" 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 _____________________________________ Time: 08:59:13 PM PST US Subject: AeroElectric-List: Re: Relay Question: Adding control relay to SD-8 circuit From: "Airdog77" 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.