Inside the charger is a board which stands perpendicular to the main board. On it are two trim pots. One is labeled I for current and the other U for voltage. Be careful as the inside of the charger is live. You must use an insulated screw driver to make the adjustments if the charger is connected to the wall or battery pack. I initially adjusted mine while it was running. I had a fan blowing over the components and had it sitting on an insulated surface. You are at your own risk doing this so make sure you know what you are doing. When charging LiFePO4 cells or any other cells which don't have a self discharge, if it is quiet and you have good hearing you can hear when the charger turns off. When the charging is almost done and the charger is in the "yellow" stage where the fans have shut off you know current is below an amp or two. If you turn the voltage screw one way the charger will start up and the other will cause it to stop (pause really). That is how I determine which way to turn the calibration screw. Naturally I had my volt meter attached across the pack so I could see what was going on. If you have a 120VAC version you can run it through a Kill A Watt meter and watch the wall power to know when it is charging or not. The idle power of an NG1 is about 4W so I would think that an NG3 would be similar.
My charger was originally programmed for 69.3V total. Through experimentation I have found that a "saturation voltage" of 69.1V lets my cells settle just below 3.40V after sitting several hours. IIRC, the theoretical 100% SOC open circuit resting voltage of LiFePO4 cells is 3.38V. I still need to do a full nothing connected resting of the pack to make sure I'm still not over charging my pack but that will have to wait until warmer weather since I want to set it when the pack is around 20°C. HTH, On Mon, Mar 25, 2013 at 5:39 PM, a.swackhammer <[email protected]> wrote: > David, so do you know what that adjustment is? > > > Sent from my Verizon Wireless 4G LTE Smartphone > > -------- Original message -------- > From: David Nelson <[email protected]> > Date: 03/25/2013 4:42 PM (GMT-08:00) > To: Electric Vehicle Discussion List <[email protected]> > Subject: Re: [EVDL] Zivan NG3 rear adjustments > > I have a 20 cell 200Ah pack. Since my older Zivan's can't terminate > charge based on voltage AND current but only taper to nearly 0A I have > found that charging to 3.455V/cell comes out very close to 100%SOC > with a top balanced pack. I am not using any cell level BMS and > haven't seen any drift in the last 15 months. > > On Mon, Mar 25, 2013 at 4:38 PM, <[email protected]> wrote: >> David, What is your pack size, voltage? Al >> >> ----- Original Message ----- >> From: "David Nelson" <[email protected]> >> To: "Electric Vehicle Discussion List" <[email protected]> >> Sent: Monday, March 25, 2013 4:28:08 PM >> Subject: Re: [EVDL] Zivan NG3 rear adjustments >> >> Did you set it the same as your other NG3? Are you sure both are >> programmed the same in the first place? I had my NG3 reprogrammed for >> my LiFePO4 pack and it looks the same as it did before I sent it in so >> just looking at the setting won't necessarily tell you anything about >> another NG3. >> >> On Mon, Mar 25, 2013 at 7:31 AM, <[email protected]> wrote: >>> >>> >>> >>> >>> >>> Good evening, I installed my second Zivan NG3 in parallel this weekend with >>> partial success. While doing the install, I think I managed to change an >>> adjustment on the rear of the original charger. It is in the round hole in >>> the rear of the charger. ( just above temp. probe socket ) I have no idea >>> where this adjustment should be? Can anyone lead me in the direction to >>> know what is this adjustment and how it should be set? I believe I changed >>> this adjustment because the end of the charge was different. It did not go >>> into the float stage as normal. >>> >>> >>> >>> As always, Thanks in advance, Al >>> -------------- next part -------------- >>> An HTML attachment was scrubbed... >>> URL: >>> <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130325/e87d348c/attachment.htm> >>> _______________________________________________ >>> 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) >>> >> >> >> >> -- >> David D. Nelson >> http://evalbum.com/1328 >> http://www.levforum.com >> >> Nokia Lumia 920 Windows Phone 8 >> _______________________________________________ >> 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) >> >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: >> <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130325/a2e7aadf/attachment.htm> >> _______________________________________________ >> 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) >> > > > > -- > David D. Nelson > http://evalbum.com/1328 > http://www.levforum.com > > Nokia Lumia 920 Windows Phone 8 > _______________________________________________ > 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) > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130325/77508148/attachment.htm> > _______________________________________________ > 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) > -- David D. Nelson http://evalbum.com/1328 http://www.levforum.com Nokia Lumia 920 Windows Phone 8 _______________________________________________ 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)
