---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 07/18/11: 11 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:27 AM - Re: Over Voltage Protection for Internal Regulated Alternators (Bubblehead) 2. 05:49 AM - TXDR & Nav/Com light sensors (Stuart Hutchison) 3. 01:06 PM - Flap control using (a) relay(s) (pmnewlon) 4. 01:50 PM - Re: Flap control using (a) relay(s) (Larry Mac Donald) 5. 02:03 PM - Re: Flap control using (a) relay(s) (B Tomm) 6. 02:13 PM - Re: Flap control using (a) relay(s) (ROGER & JEAN CURTIS) 7. 02:16 PM - Re: Flap control using (a) relay(s) (pmnewlon) 8. 04:11 PM - Re: Flap control using (a) relay(s) (Robert L. Nuckolls, III) 9. 04:14 PM - Re: Re: Over Voltage Protection for Internal Regulated Alternators (Robert L. Nuckolls, III) 10. 04:15 PM - Re: TXDR & Nav/Com light sensors (Robert L. Nuckolls, III) 11. 08:43 PM - Drawing Z-13/20 (Paul Zimmer) ________________________________ Message 1 _____________________________________ Time: 05:27:20 AM PST US Subject: AeroElectric-List: Re: Over Voltage Protection for Internal Regulated Alternators From: "Bubblehead" I agree and understand the ANL has nothing to do with OV protection. Where would I find information on going "inside the alternator and modify it in the same manner that Plane-Power does so that you have EXTERNAL control of the field supply conductor while retaining use of the internal regulator. " -------- John Keller, TX RV-8 N247TD Read this topic online here: http://forums.matronics.com/viewtopic.php?p=346876#346876 ________________________________ Message 2 _____________________________________ Time: 05:49:57 AM PST US From: "Stuart Hutchison" Subject: AeroElectric-List: TXDR & Nav/Com light sensors G'day Bob, We have a KT76C transponder, a KX-165 and a KX155 radio in our Club Piper Archer - all with gas discharge displays. At night they're all unreadable, but display just fine in daylight or if a torch is aimed at the light sensor (I assume an SPD like a camera light sensor). Before we head out to potentially get ripped off buying new circuit boards or refurbished units etc, do you know if this is a common problem and should it be a relatively easy fix? Cheers, Stu ________________________________ Message 3 _____________________________________ Time: 01:06:16 PM PST US Subject: AeroElectric-List: Flap control using (a) relay(s) From: "pmnewlon" I have two rows of SPST switches on the lower left of my instrument panel. I failed to allow enough room for the DPDT flap switch and now either have to relocate it or figure out some way to operate the flaps with the SPST (ON)OFF(ON) switch I purchased for the job. I've looked at Newark Elec for some kind of relay to do the job, but I can only think of how to do it using two SPST relays such as the B/C 704-1 - one for 'UP' the other for 'DOWN'. I would appreciate any thoughts on how to gracefully recover from my design error. Thanks! Phil Read this topic online here: http://forums.matronics.com/viewtopic.php?p=346914#346914 ________________________________ Message 4 _____________________________________ Time: 01:50:18 PM PST US Subject: Re: AeroElectric-List: Flap control using (a) relay(s) From: Larry Mac Donald Phil, You could do that job with what is called a "Latching relay" Larry On Jul 18, 2011, at 4:02 PM, pmnewlon wrote: > > I have two rows of SPST switches on the lower left of my instrument panel. I failed to allow enough room for the DPDT flap switch and now either have to relocate it or figure out some way to operate the flaps with the SPST (ON)OFF(ON) switch I purchased for the job. I've looked at Newark Elec for some kind of relay to do the job, but I can only think of how to do it using two SPST relays such as the B/C 704-1 - one for 'UP' the other for 'DOWN'. I would appreciate any thoughts on how to gracefully recover from my design error. > > Thanks! > > Phil > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=346914#346914 > > > > > > > > > > > ____________________________________________________________ Penny Stock Jumping 3000% Sign up to the #1 voted penny stock newsletter for free today! http://thirdpartyoffers.juno.com/TGL3141/4e249b905b34d8a5c4st06vuc ________________________________ Message 5 _____________________________________ Time: 02:03:14 PM PST US From: "B Tomm" Subject: RE: AeroElectric-List: Flap control using (a) relay(s) You could add a flap controller such as what Vans sells. Has few nice features. Bevan -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of pmnewlon Sent: Monday, July 18, 2011 1:03 PM Subject: AeroElectric-List: Flap control using (a) relay(s) I have two rows of SPST switches on the lower left of my instrument panel. I failed to allow enough room for the DPDT flap switch and now either have to relocate it or figure out some way to operate the flaps with the SPST (ON)OFF(ON) switch I purchased for the job. I've looked at Newark Elec for some kind of relay to do the job, but I can only think of how to do it using two SPST relays such as the B/C 704-1 - one for 'UP' the other for 'DOWN'. I would appreciate any thoughts on how to gracefully recover from my design error. Thanks! Phil Read this topic online here: http://forums.matronics.com/viewtopic.php?p=346914#346914 ________________________________ Message 6 _____________________________________ Time: 02:13:12 PM PST US From: "ROGER & JEAN CURTIS" Subject: RE: AeroElectric-List: Flap control using (a) relay(s) I have two rows of SPST switches on the lower left of my instrument panel. I failed to allow enough room for the DPDT flap switch and now either have to relocate it or figure out some way to operate the flaps with the SPST (ON)OFF(ON) switch I purchased for the job. I've looked at Newark Elec for some kind of relay to do the job, but I can only think of how to do it using two SPST relays such as the B/C 704-1 - one for 'UP' the other for 'DOWN'. I would appreciate any thoughts on how to gracefully recover from my design error. Thanks! Phil A simple way is to use two dpst automotive relays, one wired for flaps up and the other for flaps down, then simply control them with your installed spdt switch. Roger ________________________________ Message 7 _____________________________________ Time: 02:16:32 PM PST US Subject: AeroElectric-List: Re: Flap control using (a) relay(s) From: "pmnewlon" Hmmmm, from what I read of the description of one such relay on the newark site, a latching relay stays in the last position until power is applied in the other direction. I would need a '3 position' relay - up, no power, down. "Magnetic Latching relays require one pulse of coil power to move their contacts in one direction, and another, redirected pulse to move them back. Repeated pulses from the same input have no effect. Magnetic Latching relays are useful in applications where interrupted power should not be able to transition the contacts." Read this topic online here: http://forums.matronics.com/viewtopic.php?p=346927#346927 ________________________________ Message 8 _____________________________________ Time: 04:11:09 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Flap control using (a) relay(s) At 03:02 PM 7/18/2011, you wrote: > >I have two rows of SPST switches on the lower left of my instrument >panel. I failed to allow enough room for the DPDT flap switch and >now either have to relocate it or figure out some way to operate the >flaps with the SPST (ON)OFF(ON) switch I purchased for the >job. I've looked at Newark Elec for some kind of relay to do the >job, but I can only think of how to do it using two SPST relays such >as the B/C 704-1 - one for 'UP' the other for 'DOWN'. I would >appreciate any thoughts on how to gracefully recover from my design error. Using the pair of relays as shown in http://www.aeroelectric.com/PPS/Flight/Flaps/Flaps_3.pdf is about a graceful as it gets. With both relays de-energized, their relaxed contacts put a dead short on the motor bringing it to a fast halt. The relays are inexpensive . . . Emacs! This model comes with it's own mounting bracket. http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=255-2729-ND Bob . . . ________________________________ Message 9 _____________________________________ Time: 04:14:19 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Over Voltage Protection for Internal Regulated Alternators At 07:23 AM 7/18/2011, you wrote: > >I agree and understand the ANL has nothing to do with OV protection. > >Where would I find information on going "inside the alternator and >modify it in the same manner that Plane-Power does so that you have >EXTERNAL control of the field supply conductor while retaining use >of the internal regulator. " Hmmmm . . . there was a set of instructions unique to a particular series of ND alternators that spoke to removing the built-in regulator and converting it to external (a-la B&C L-series). But I've not seen anything that shows how to leave it in. It's something an alternator repair shop might be able to help you with. Bob . . . ________________________________ Message 10 ____________________________________ Time: 04:15:42 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: TXDR & Nav/Com light sensors At 07:47 AM 7/18/2011, you wrote: >G'day Bob, > >We have a KT76C transponder, a KX-165 and a KX155 radio in our Club >Piper Archer - all with gas discharge displays. > >At night they're all unreadable, but display just fine in daylight >or if a torch is aimed at the light sensor (I assume an SPD like a >camera light sensor). > >Before we head out to potentially get ripped off buying new circuit >boards or refurbished units etc, do you know if this is a common >problem and should it be a relatively easy fix? > I'm sorry, I've not had any experience or insight from others as to how you might deal with this issue. Suggest you post it to the list. Somebody might have more knowledge than I. Bob . . . ________________________________ Message 11 ____________________________________ Time: 08:43:44 PM PST US From: "Paul Zimmer" Subject: AeroElectric-List: Drawing Z-13/20 Forget my question (if you haven't done so already) regarding why Z-13/20 went away with Revision 12 of AEC. I found my answer. I'm getting this Matronics Email-Serve thing figured out (i.e. search - Duh!). You must have the patience of Job, being asked the same question over and over. That said, I did an analysis of Z-12, and it is quite similar to Z-13/20 with a few notable exceptions. I have a couple of questions and observations regarding Z-12. The field for both alternators is fed from the main bus. If the Aux alternator field was fed from the E-Bus, it would provide battery current should the Battery Contactor Fail (however unlikely), with no apparent downside to the overall design, other than the E-Bus alternate feed would need to be switched on. Am I reading this right, or is there more to it? This brings up a more basic question. What is the intended normal operating position of the E-Bus Alternate Feed Switch? It would seem that it could be operated in the "On" position (enabled to provide battery power "when" the battery contactor fails) or Off position (requiring it to be turned on "when" the contactor fails). The Z-12 design powers both the main and E-Bus from both alternators. Does this assume the pilot will shed load (if necessary) from the main bus necessary to stay below the output of the backup alternator in order to save the battery, until those devices are required for approach and landing? Bob, I'm sure you know that when we ask these questions, it's because (hopefully) we are thinking, which is a good thing. I'm sure you're beyond taking challenges/questioning of your designs personally. I for one really appreciate you taking the time to answer questions and being here to educate. 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