On Sun Nov 10 15:05:24 PST 2019 [email protected] said: >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?
In this case, the leakage is from the Pack +/- to the output -12v connection. The pack circuit is open mid-pack, so there is NO voltage on the supply HV inputs. When the ma meter is going through a 1K resistor between either side of the pack, and 12v Gnd, I get a solid 0.34 ma that holds steady. This is from about the 32v point on either the + or - side of the pack. Current polarity is the opposite between the sides. So, the only conduction path is through the power supply from either HV input to the -12v side of the output. If I do NOT open the pack, so the DC-DC are powered, AND check at higher voltage point in the pack, the leakage current goes up significantly. There is no "ground", as one of these power supplies is a potted plastic box, with no input ground lead, and the other is a metal box that is sitting on a chunk of plastic with no connection from it's case to the metal of the truck. -- Bobcats and Cougars, oh my! http://john.casadelgato.com/Pets _______________________________________________ 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)
