AeroElectric-List Digest Archive

Tue 06/20/17


Total Messages Posted: 9



Today's Message Index:
----------------------
 
     1. 12:32 AM - Re: com dual PWR/GND on two fuses? (Werner Schneider)
     2. 05:51 AM - Re: com dual PWR/GND on two fuses? (user9253)
     3. 06:25 AM - Re: com dual PWR/GND on two fuses? (Robert McCallum)
     4. 07:43 AM - Re: Re: com dual PWR/GND on two fuses? (Werner Schneider)
     5. 08:01 AM - Tosten grip wiring with car-relay for trim (Achille)
     6. 09:14 AM - Re: com dual PWR/GND on two fuses? (Alec Myers)
     7. 01:12 PM - Re: com dual PWR/GND on two fuses? (Charlie England)
     8. 02:02 PM - Re: com dual PWR/GND on two fuses? (Alec Myers)
     9. 07:46 PM - Re: Tosten grip wiring with car-relay for trim (Robert L. Nuckolls, III)
 
 
 


Message 1


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    Time: 12:32:38 AM PST US
    Subject: Re: com dual PWR/GND on two fuses?
    From: Werner Schneider <glastar@gmx.net>
    Ok after reading again through the AeroElectric Connection about wires and fuses I come to following conclusion. According the Icom Manual we use 2x AWG20, together they are fine for a 10A fuse, as I remain with my original SL-30 setup (2 wires with a fuse each) I could go for 7.5A each, considering the power of the unit I might stay with 2x 5 A out of convienence but will first check how much power the Icom draws when transmitting, I bet it will be below 5 :). If I would go for a dual cable crimped into a single fuse, I would rather prefer a 7.5A fuse, so when one wire breaks it will still be adequate, however taking into account the relative short wire a 10A might be fine. Thanks for your ideas. Cheers Werner On 19.06.2017 19:35, Robert McCallum wrote: > > Always bear in mind that the fuses are sized to protect the wire and > what is connected at the other end (in this case your radio) has no > influence on the fuse size used. > > As long as the wires are adequate for the 10 Amps then 10 Amp fuses > are fine and certainly if the existing wiring will supply the new > device's requirements then they may be reused/re-purposed. > > Bob McC > >


    Message 2


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    Time: 05:51:21 AM PST US
    Subject: Re: com dual PWR/GND on two fuses?
    From: "user9253" <fransew@gmail.com>
    Some avionics use two pins for positive power and two pins for negative power. The reason for using two pins is not for redundancy. The reason is that if only one D-Sub pin carried all of the current, it would be overloaded. The problem of using two fuses is that if one fuse blows, then all of the current will flow through one D-Sub pin and overload it. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=470261#470261


    Message 3


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    Time: 06:25:34 AM PST US
    From: Robert McCallum <robert.mccallum2@sympatico.ca>
    Subject: com dual PWR/GND on two fuses?
    Correct. However the assumption must be made that the wire installed is ade quate for the intended task. My point was that if you've installed a 14ga wire yo u protect it with the appropriate fuse for that wire, and not necessarily dow nsize the fuse because the device you're powering draws only 1 amp. Once adequacy of both wire and fuse is established then the fuse size chosen becomes a funct ion of the wire and not the connected load. Respectfully Bob McC > ---------- Original Message ---------- > From: Carlos Trigo <trigo@mail.telepac.pt> > Date: June 19, 2017 at 5:38 PM > > > Hi Bob > > > > You are right that the fuse is there to protect the wire, but the siz e (in > A) of the fuse is a function of the current which is drawn by what is > connected at the other end of the wire, isn=99t it? > > > > Otherwise you could put a 1A fuse to protect a #24 wire with a pitot > heater at the end, and you would never see that heater working when you w anted > it. > > > > With due respect > > Carlos > > > > De: owner-aeroelectric-list-server@matronics.com > [mailto:owner-aeroelectric-list-server@matronics.com] Em nome de Robert > McCallum > Enviada: Monday, June 19, 2017 6:35 PM > Para: aeroelectric-list <aeroelectric-list@matronics.com> > Assunto: Re: AeroElectric-List: com dual PWR/GND on two fuses? > > > > Always bear in mind that the fuses are sized to protect the wire and what > is connected at the other end (in this case your radio) has no influence on > the fuse size used. > > As long as the wires are adequate for the 10 Amps then 10 Amp fuses a re > fine and certainly if the existing wiring will supply the new device's > requirements then they may be reused/re-purposed. > > Bob McC > > > > > > ---------- Original Message ---------- > > From: Werner Schneider <glastar@gmx.net <mailto:glastar@gmx.net > > > > Date: June 16, 2017 at 5:20 PM > > > > > > <glastar@gmx.net <mailto:glastar@gmx.net> > > > > > Hello, > > > > most avionics do have PWR and GND on two pins. My SL30 had even one > > used > > for the NAV part (3A fused) and one for the COM part (5A fused) . > > > > I have to replace it with a new 8.33, but just going for a COM right > > now, that one has as well 2 pins each tied together, PWR onto a 10A > > fuse > > (8W COM). > > > > Is there any disadvantage, if I use the existing cabling with t he 2x > > GND/PWR on extra fuses? Should I use 2x10A fuses (for a 8W com I > > found > > the 10A a bit high). > > > > Thanks for your advice > > > > Cheers W-================== =============== > > > > > > > > > >


    Message 4


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    Time: 07:43:40 AM PST US
    Subject: Re: com dual PWR/GND on two fuses?
    From: Werner Schneider <glastar@gmx.net>
    Thanks Joe for that warning, that is why I fuse for 5A only I still wonder the Icom uses a 10 A fuse for a 8W com and the SL30 was using a 5A for a 12 W COM. I believe the d-subs are rated 5A and if you break one cable it would be the same issue at the pin side. At the end I will see what it draws (the KX-125 I had at the begin on Xmit was drawing 3.8A) and leave another 30% as margin. it is just convenient to leave it as it is. Cheers Werner On 20.06.2017 14:49, user9253 wrote: > > Some avionics use two pins for positive power and two pins for negative power. The reason for using two pins is not for redundancy. The reason is that if only one D-Sub pin carried all of the current, it would be overloaded. The problem of using two fuses is that if one fuse blows, then all of the current will flow through one D-Sub pin and overload it. >


    Message 5


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    Time: 08:01:32 AM PST US
    Subject: Tosten grip wiring with car-relay for trim
    From: "Achille" <mickael.t@live.fr>
    Hello, I want to wire my new grip tosten with my basic 12v electrical actuating as trim (up/down) pulling a spring. I bought a double car relay to do some test to find the good wiring diagram but before that I prefer asking in this forum how can I wire it if anybody know the response ? Before I was a double pole switch, wire by the previous owner. I had a problem with the previous wiring, when i actuated my trim, my compas begin to turn completely. The motor/switch were not close to the compas. I have tested to set the motor very close to the compas to do a test. Without all the wire juste motor and a small battery. And in this case it don't turn ! I don't understand why. I find this documentation to do my wire. Thank you in advance. Mickal Read this topic online here: http://forums.matronics.com/viewtopic.php?p=470273#470273 Attachments: http://forums.matronics.com//files/capture_dcran_2017_06_20__170003_154.png http://forums.matronics.com//files/capture_dcran_2017_06_20__165117_106.png


    Message 6


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    Time: 09:14:28 AM PST US
    From: Alec Myers <alec@alecmyers.com>
    Subject: Re: com dual PWR/GND on two fuses?
    It would be dumb to put a 20A breaker on a 2A load, regardless of what wire y ou used. On Jun 20, 2017, at 09:23, Robert McCallum <robert.mccallum2@sympatico.ca> w rote: Correct. However the assumption must be made that the wire installed is adeq uate for the intended task. My point was that if you've installed a 14ga wir e you protect it with the appropriate fuse for that wire, and not necessaril y downsize the fuse because the device you're powering draws only 1 amp. Onc e adequacy of both wire and fuse is established then the fuse size chosen be comes a function of the wire and not the connected load. Respectfully Bob McC > ---------- Original Message ---------- > From: Carlos Trigo <trigo@mail.telepac.pt> > Date: June 19, 2017 at 5:38 PM > > Hi Bob > > > > You are right that the fuse is there to protect the wire, but the size (in A) of the fuse is a function of the current which is drawn by what is conne cted at the other end of the wire, isn=99t it? > > > > Otherwise you could put a 1A fuse to protect a #24 wire with a pitot heate r at the end, and you would never see that heater working when you wanted it . > > > > With due respect > > Carlos > > > > De: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectri c-list-server@matronics.com] Em nome de Robert McCallum > Enviada: Monday, June 19, 2017 6:35 PM > Para: aeroelectric-list <aeroelectric-list@matronics.com> > Assunto: Re: AeroElectric-List: com dual PWR/GND on two fuses? > > > > Always bear in mind that the fuses are sized to protect the wire and what i s connected at the other end (in this case your radio) has no influence on t he fuse size used. > > As long as the wires are adequate for the 10 Amps then 10 Amp fuses are fi ne and certainly if the existing wiring will supply the new device's require ments then they may be reused/re-purposed. > > Bob McC > > ---------- Original Message ---------- > From: Werner Schneider <glastar@gmx.net> > Date: June 16, 2017 at 5:20 PM > > > > > Hello, > > most avionics do have PWR and GND on two pins. My SL30 had even one used > for the NAV part (3A fused) and one for the COM part (5A fused). > > I have to replace it with a new 8.33, but just going for a COM right > now, that one has as well 2 pins each tied together, PWR onto a 10A fuse > (8W COM). > > Is there any disadvantage, if I use the existing cabling with the 2x > GND/PWR on extra fuses? Should I use 2x10A fuses (for a 8W com I found > the 10A a bit high). > > Thanks for your advice > > Cheers W-====================== =========== > > > > >


    Message 7


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    Time: 01:12:57 PM PST US
    Subject: Re: com dual PWR/GND on two fuses?
    From: Charlie England <ceengland7@gmail.com>
    Unless, of course, you have a limited number of fuse locations, and therefore, multiple non-critical 2A loads on one circuit that has wiring sized to accept a 20A fuse. The fuse protects the wire. (There's a period at the end of that sentence...) :-) On 6/20/2017 11:13 AM, Alec Myers wrote: > It would be dumb to put a 20A breaker on a 2A load, regardless of what > wire you used. > > On Jun 20, 2017, at 09:23, Robert McCallum > <robert.mccallum2@sympatico.ca <mailto:robert.mccallum2@sympatico.ca>> > wrote: > > Correct. However the assumption must be made that the wire installed > is adequate for the intended task. My point was that if you've > installed a 14ga wire you protect it with the appropriate fuse for > that wire, and not necessarily downsize the fuse because the device > you're powering draws only 1 amp. Once adequacy of both wire and fuse > is established then the fuse size chosen becomes a function of the > wire and not the connected load. > > Respectfully > > Bob McC > > >> ---------- Original Message ---------- >> From: Carlos Trigo <trigo@mail.telepac.pt >> <mailto:trigo@mail.telepac.pt>> >> Date: June 19, 2017 at 5:38 PM >> >> Hi Bob >> >> You are right that the fuse is there to protect the wire, but the >> size (in A) of the fuse is a function of the current which is drawn >> by what is connected at the other end of the wire, isnt it? >> >> Otherwise you could put a 1A fuse to protect a #24 wire with a pitot >> heater at the end, and you would never see that heater working when >> you wanted it. >> >> With due respect >> >> Carlos >> >> *De:* owner-aeroelectric-list-server@matronics.com >> <mailto:owner-aeroelectric-list-server@matronics.com> >> [mailto:owner-aeroelectric-list-server@matronics.com] *Em nome de >> *Robert McCallum >> *Enviada:* Monday, June 19, 2017 6:35 PM >> *Para:* aeroelectric-list <aeroelectric-list@matronics.com >> <mailto:aeroelectric-list@matronics.com>> >> *Assunto:* Re: AeroElectric-List: com dual PWR/GND on two fuses? >> >> Always bear in mind that the fuses are sized to protect the wire and >> what is connected at the other end (in this case your radio) has no >> influence on the fuse size used. >> >> As long as the wires are adequate for the 10 Amps then 10 Amp fuses >> are fine and certainly if the existing wiring will supply the new >> device's requirements then they may be reused/re-purposed. >> >> Bob McC >> >> ---------- Original Message ---------- >> From: Werner Schneider <glastar@gmx.net <mailto:glastar@gmx.net>> >> Date: June 16, 2017 at 5:20 PM >> >> >> <glastar@gmx.net <mailto:glastar@gmx.net>> >> >> Hello, >> >> most avionics do have PWR and GND on two pins. My SL30 had even >> one used >> for the NAV part (3A fused) and one for the COM part (5A fused). >> >> I have to replace it with a new 8.33, but just going for a COM right >> now, that one has as well 2 pins each tied together, PWR onto a >> 10A fuse >> (8W COM). >> >> Is there any disadvantage, if I use the existing cabling with the 2x >> GND/PWR on extra fuses? Should I use 2x10A fuses (for a 8W com I >> found >> the 10A a bit high). >> >> Thanks for your advice >> >> Cheers W-================================= >> >> > >> > --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus


    Message 8


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    Time: 02:02:05 PM PST US
    From: Alec Myers <alec@alecmyers.com>
    Subject: Re: com dual PWR/GND on two fuses?
    It's not an absolute requirement that, for the fuse to do its job and protec t the wire, it has exactly to match the listed maximum current capacity of t he wire. A fuse can protect the wire just as well (and some who live on the e dge might say even better) if the fuse is chosen to be appropriate to the lo ad. However you want to punctuate it. On Jun 20, 2017, at 16:15, Charlie England <ceengland7@gmail.com> wrote: Unless, of course, you have a limited number of fuse locations, and therefor e, multiple non-critical 2A loads on one circuit that has wiring sized to ac cept a 20A fuse. The fuse protects the wire. (There's a period at the end of that sentence... ) :-) > On 6/20/2017 11:13 AM, Alec Myers wrote: > It would be dumb to put a 20A breaker on a 2A load, regardless of what wir e you used. > > On Jun 20, 2017, at 09:23, Robert McCallum <robert.mccallum2@sympatico.ca> wrote: > > Correct. However the assumption must be made that the wire installed is ad equate for the intended task. My point was that if you've installed a 14ga w ire you protect it with the appropriate fuse for that wire, and not necessar ily downsize the fuse because the device you're powering draws only 1 amp. O nce adequacy of both wire and fuse is established then the fuse size chosen b ecomes a function of the wire and not the connected load. > Respectfully > Bob McC > >> ---------- Original Message ---------- >> From: Carlos Trigo <trigo@mail.telepac.pt> >> Date: June 19, 2017 at 5:38 PM >> >> Hi Bob >> >> >> >> You are right that the fuse is there to protect the wire, but the size (i n A) of the fuse is a function of the current which is drawn by what is conn ected at the other end of the wire, isn=99t it? >> >> >> >> Otherwise you could put a 1A fuse to protect a #24 wire with a pitot heat er at the end, and you would never see that heater working when you wanted i t. >> >> >> >> With due respect >> >> Carlos >> >> >> >> De: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectr ic-list-server@matronics.com] Em nome de Robert McCallum >> Enviada: Monday, June 19, 2017 6:35 PM >> Para: aeroelectric-list <aeroelectric-list@matronics.com> >> Assunto: Re: AeroElectric-List: com dual PWR/GND on two fuses? >> >> >> >> Always bear in mind that the fuses are sized to protect the wire and what is connected at the other end (in this case your radio) has no influence on the fuse size used. >> >> As long as the wires are adequate for the 10 Amps then 10 Amp fuses are f ine and certainly if the existing wiring will supply the new device's requir ements then they may be reused/re-purposed. >> >> Bob McC >> >> ---------- Original Message ---------- >> From: Werner Schneider <glastar@gmx.net> >> Date: June 16, 2017 at 5:20 PM >> >> t> >> >> Hello, >> >> most avionics do have PWR and GND on two pins. My SL30 had even one used >> for the NAV part (3A fused) and one for the COM part (5A fused). >> >> I have to replace it with a new 8.33, but just going for a COM right >> now, that one has as well 2 pins each tied together, PWR onto a 10A fuse >> (8W COM). >> >> Is there any disadvantage, if I use the existing cabling with the 2x >> GND/PWR on extra fuses? Should I use 2x10A fuses (for a 8W com I found >> the 10A a bit high). >> >> Thanks for your advice >> >> Cheers W-====================== =========== >> >> > >> > > > Virus-free. www.avast.com


    Message 9


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    Time: 07:46:40 PM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Tosten grip wiring with car-relay for trim
    At 10:01 AM 6/20/2017, you wrote: > >Hello, > >I want to wire my new grip tosten with my basic 12v electrical >actuating as trim (up/down) pulling a spring. > >I bought a double car relay to do some test to find the good wiring >diagram but before that I prefer asking in this forum how can I wire >it if anybody know the response ? > >Before I was a double pole switch, wire by the previous owner. > >I had a problem with the previous wiring, when i actuated my trim, >my compas begin to turn completely. The motor/switch were not close >to the compas. > >I have tested to set the motor very close to the compas to do a >test. Without all the wire juste motor and a small battery. And in >this case it don't turn ! I don't understand why. It's difficult to diagnose the underlying physics for your observations without first- hand observation and diagnosis. I can tell you that incidences of wiring interfering with the compass is rare. Suggest you get the new trim system installed using the drawing cited below as guidance. Then see if the compass is still getting trashed . . . it will be easier to figure out why it IS having problems than to figure out why it is NOT having problems. >I find this documentation to do my wire. I think this wiring diagram is what you're needing. http://tinyurl.com/y7mwhg4t Bob . . .




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