---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Tue 01/26/21: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:53 AM - Re: Re: bench power (Jeff Luckey) 2. 01:53 PM - Re: Re: bench power (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 08:53:20 AM PST US From: Jeff Luckey Subject: Re: AeroElectric-List: Re: bench power Hello Bob, "is there something i may be applying power to that may cause harm.." Probably the riskiest thing would be that you have power wires reversed on some gizmo/accessory.=C2- If you put reverse polarity on a device that is not protected for it, you could ruin it, even if it is turned off.=C2- S o be sure to triple check polarity. "...can anything detrimental happen to the charging system if power is appl ied to the field wire ..." No.=C2- The only issue with having power on the field is that it will hea t-up the field inside the alternator and with no rotation there would be li ttle cooling.=C2- I don't know your setup but typically you would=C2-re move power from the regulator by opening=C2-the field breaker. Another thing to consider is keying-up a transmitter without an antenna.=C2 - In the old days you could damage the output stage of the transmitter wi thout an antenna load.=C2- Another Lister with more knowledge about trans mitters might provide more info. -Jeff On Monday, January 25, 2021, 04:12:02 PM PST, bobnoffs wrote: when i use the 'bench power 'source i plan to only power a small part of my panel at a time. a couple amps. my questions are1. is there something i ma y be applying power to that may cause harm the way i plan to do it and 2. c an anything detrimental happen to the charging system if power is applied t o the field wire. sorry if i wasn't clear. i know this is kind of ambiguous as panel wiring varies. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=500422#500422 - S - WIKI - - =C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin. ________________________________ Message 2 _____________________________________ Time: 01:53:37 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: bench power >"...can anything detrimental happen to the charging system if power >is applied to the field wire ..." > >No. The only issue with having power on the field is that it will >heat-up the field inside the alternator and with no rotation there >would be little cooling. I don't know your setup but typically you >would remove power from the regulator by opening the field breaker. or having the OFF/BAT/ALT+BAT switch in OFF or BAT >Another thing to consider is keying-up a transmitter without an antenna. >In the old days you could damage the output stage of the transmitter >without an antenna load. Another Lister with more knowledge about >transmitters might provide more info. That's sorta true in the vacuum tube days . . . but still valid for long intervals of unloaded transmission. Early solid state transmitters were germanium transistors and fragile compared to modern FETS. It wasn't an instantaneous thing but yeah . . . long-winded 'tests' were hard on them. This also pre-dated built-in SWR monitor circuits that reduce or shut off drive to output stage if poorly terminated. There probably hasn't been a VHF Comm transceiver in the last 40 years that doesn't have high SWR protection. Bob . . . Un impeachable logic: George Carlin asked, "If black boxes survive crashes, why don't they make the whole airplane out of that stuff?" ------------------------------------------------------------------------------------- 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.