John, You do not really have a ground fault, it seems your power supplies have an input circuit that causes a small current to ground, possibly they have a MOV or other protective device on their input or a discharge resistor that takes care of the required removal of voltage from input capacitor when the power supply is unplugged, so you can't be shocked by the prongs of the cord after unplugging?
You may need to open on supply to inspect if you can modify it if you need to remove the leakage. I have been surprised by the ~380v on the Leaf pack when the BMS is still plugged in, if you remove BMS first then the cells are isolated and no electrical stinging happens when working on the cells themselves. Cor. On Sun, Nov 10, 2019, 11:45 AM John Lussmyer via EV <[email protected]> wrote: > I seem to have a ground fault in my truck. > I was working on the BMS, and when my finger touched one of the busbars, I > got a shock. (forearm was leaning on the truck frame.) > To find where it was coming from, I put a 1K resistor in series with my > meter lead, tied the other end to ground, and set the meter to read ma. > Touched the other lead to the pack, about 1/3 from one end - about 1.3 ma. > Turned off the main breaker, which splits the pack into 4 (odd sized) > sections. > No leakage from the middle 2 sections, but about 0.4ma leakage amounts > from either of the 2 "end" sections (about 32v ea). (both still have one > end connected to the truck systems.) > So I start disconnecting truck systems. > Found that the leakage seems to be coming from the 2 small DC-DC > converters (actually, power supplies) that I use to keep the Zilla powered > up, and maintain the 12v battery. Both of these are UL approved isolated > power supplies. > > Now what? I need the DC-DC's, but I really do NOT want a ground fault. > > -- > Worlds only All Electric F-250 truck! > http://john.casadelgato.com/Electric-Vehicles/1995-Ford-F-250 > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > ARCHIVE: http://www.evdl.org/archive/index.html > INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Please discuss EV drag racing at NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20191110/bd37c3b6/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/index.html INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
