Well, my system floats from the frame, but lightobject responded: : The power of the JLD404 is isolated and the ground of the : power negative has no common to the Input ground. You do : NOT want to common ground the power and the INPUT ground. : Otherwise, the amp meter won't work and that is the pretty of the : JLD404 with isolated Ground
So I guess it's off to ebay for an isolating power supply. I haven't seen one yet that can handle 48V and output 12V, so it looks like I'll have to put it downstream from my buck converter. On Thu, May 15, 2014 at 1:34 PM, Rick Beebe <r...@beebe.org> wrote: > Jack's concern was that the meter might make a connection between frame > ground and the high voltage pack so he put the DC-DC in for isolation. I > did have that problem on the analog volt meter I used to have in the > truck so I put one in as well. However I don't have any evidence to > suggest it's really necessary for this meter. I haven't found any > continuity between the 12v power and high voltage connections on the > meter. But the DC-DC was only a couple bucks so it was cheap insurance. > > --Rick > > On 05/14/2014 08:17 PM, Michael K Johnson wrote: >> Thank you! That's perfect! All you are really doing is programming >> mV/A with a max of 75mV, so that makes sense. >> >> The EVTV diagram says "Isolated 12v to 12v DC-DC Converter". I didn't >> see anywhere else that the negative power terminal on the JLD404AH >> cannot be tied to the COM terminal. And all my 12V regulated supplies >> are common negative. I don't have a separate 12V house battery in the >> lawn tractor. Are you using an isolated dc-dc converter in your truck? >> >> >> On Wed, May 14, 2014 at 9:10 AM, Rick Beebe via EV <ev@lists.evdl.org> wrote: >>> I have one in my truck and it works great. It wants a 75mV shunt but I >>> have a 50mV/500A. You just lie the meter--I.e. I said it was connected >>> to a 75mV/750A shunt. >>> >>> The manual is available here: >>> http://www.lightobject.info/viewtopic.php?f=14&t=1074 >>> >>> Jack Rickard of EVTV has written a plain english one here: >>> http://media3.evtv.me/JLD404AH.pdf. >>> >>> --Rick _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
