---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 10/07/10: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:39 AM - 3300 alternator fuse (bob noffs) 2. 05:38 AM - Re: Plane Power Alt. (Kevin Boddicker) 3. 08:07 AM - Re: Plane Power Alt. (Robert L. Nuckolls, III) 4. 08:24 AM - Re: 3300 alternator fuse (Robert L. Nuckolls, III) 5. 10:51 AM - Re: Z8 Ground Power test switch (jonlaury) 6. 03:01 PM - Re: Z8 Ground Power test switch (user9253) 7. 08:16 PM - Re: Z8 Ground Power test switch (user9253) ________________________________ Message 1 _____________________________________ Time: 04:39:32 AM PST US Subject: AeroElectric-List: 3300 alternator fuse From: bob noffs i recently heard of a jab installation where the regulator shorted out , causing damage to the firewall! shouldn't the connection between the alternator and the regulator be fused ? which wire? i was told the Z schematic doesn't show any such fuses. bob noffs ________________________________ Message 2 _____________________________________ Time: 05:38:48 AM PST US Subject: Re: AeroElectric-List: Plane Power Alt. From: Kevin Boddicker Bob, You are a good teacher! That is exactly what I thought I should do, just looking for verification. Again thanks a million for all you do and the help you offer to everyone. I am certain many others feel the same way. Kevin Boddicker TriQ 200 N7868B 190hrs Luana, IA. On Oct 6, 2010, at 9:59 PM, Robert L. Nuckolls, III wrote: > > Yes, > I am using the basic Z-11, with a B&C over voltage/under voltage module wired to trip a 5A breaker. In case of an OV event the contactor in the B lead would open. Essentially I would have two OV systems. > > Okay, since the PlanePower product is self contained > and features ov protection I recommend you remove the > previously installed system. I.e., install the PP > alternator per manufacturer's instructions. > > > There is one built into my plane as it sits, using the module that I bought from B&C BC207-1/AEC9034-1, > And there is one built into the new plane power alt. I have the module that will open the 5A breaker if there is an OV event with my current ND alt. The module is also used to test an OV event, and indicates low voltage. > Are you saying I should disconnect the OVM I got from B&C and just use the OV protection built into the Plane Power alt. > > The BC207/AEC9034 is a simple OV/LV annunciator and has > no protective features. It was designed for very > small PM alternator/battery systems common to > the 2-cycle powered ultralights. In your case, > the OV warning would NEVER be expected to > operate because the ov protection system would > shut the system down so fast that you'll never > see an OV indication . . . only an LV indication > after the alternator is shut down. > > The OVM from B&C and what ever Plane Power uses. I will attach a pic of the OVM. Hope it gets through. > > That's the legacy crowbar ov protection module > produced first by AEC, then by B&C and now by > both companies. Yes, take that unit out along > with the associated b-lead contactor. > > > Bob . . . > > > > > ________________________________ Message 3 _____________________________________ Time: 08:07:40 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Plane Power Alt. At 07:35 AM 10/7/2010, you wrote: > >Bob, >You are a good teacher! That is exactly what I thought I should do, >just looking for verification. >Again thanks a million for all you do and the help you offer to >everyone. I am certain many others feel the same way. > I'm pleased that you find the service useful! Bob . . . ________________________________ Message 4 _____________________________________ Time: 08:24:01 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 3300 alternator fuse At 06:35 AM 10/7/2010, you wrote: >i recently heard of a jab installation where the regulator shorted >out , causing damage to the firewall! > shouldn't the connection between the alternator and the regulator > be fused ? which wire? > i was told the Z schematic doesn't show any such fuses. This is a mixed bag. Just because something overheats and even catches fire does not necessarily mean that a current overload was involved. I've worked a number of airborne failures that produced severe damage and/or fires that never tripped a breaker. Breakers and fuses are designed to clear the "hard fault" . . . a current flow that is several times greater than the protection rating. The fault clears in milliseconds to perhaps a few seconds. While the currents are high, the duration is short and total energy dumped is relatively small. "Soft faults" are long term, intermittent shorts or sustained arcing scenarios where current flow is not great enough to trip the protection. Nonetheless, LARGE quantities of electrical energy is converted to heat that can erode structural materials and ignite combustibles. It wouldn't hurt to fuse the alternator leads. A 30A in-line fuse in one lead would provide protection against hard rectifier/regulator faults but NOT necessarily prevent the incident you described. Bob . . . ________________________________ Message 5 _____________________________________ Time: 10:51:33 AM PST US Subject: AeroElectric-List: Re: Z8 Ground Power test switch From: "jonlaury" Joe, In the attached, how would you wire the switch so that the contactor coil is not energized when using the momentary half of the switch and yet preserving OV protection for both halves? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=315041#315041 Attachments: http://forums.matronics.com//files/gpj_test_switch_tentative_137.pdf ________________________________ Message 6 _____________________________________ Time: 03:01:41 PM PST US Subject: AeroElectric-List: Re: Z8 Ground Power test switch From: "user9253" John, That is hard to answer without knowing exactly how the switch operates and what you are trying to accomplish. But here is an educated guess based on your first post. Connect switch terminals 2 and 5 together. Connect a lamp between terminal 3 and terminal 4 (or between 3 & 6, depending on when you want the lamp to light). The lamp should be very low wattage or an LED so that current through the lamp is not enough to energize the contactor coil. If the contactor coil is not energized, then you do not need OV protection. If you provide more details about your goals and a data sheet for the switch, then I can confirm or modify my suggestions. Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=315056#315056 ________________________________ Message 7 _____________________________________ Time: 08:16:31 PM PST US Subject: AeroElectric-List: Re: Z8 Ground Power test switch From: "user9253" John, Disregard my previous suggestion. I deleted my bad advice. I am going away for a couple of days and will think about your circuit. Meanwhile, explain exactly how you want the circuit to work. Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=315082#315082 ------------------------------------------------------------------------------------- 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.