Some time ago I mention that a motor ampere was still being display when I let up the acceleration while coasting down hill at a higher rpm than it took to drive up the hill.
After coasting down the hill and when the motor rpm drop, than the motor ampere went away. Got home, and started to charge the battery. When the AH meter read 100% SOC, I turn off the charger right away, normally I may turn it off about a minute later when it read 100% SOC. But when I turn off the charger right when it reads 100% SOC, the charger voltage indicators will still read the charger voltage about 218 to 225 volts for a 180 volt pack. According to Café Electric, the battery pack voltages becomes less voltage than the charger voltage right at the time you turn off the charger power at 100% SOC. The charger voltage, being at a higher voltage, charges the PFC capacitor bank at the peak charger voltage. When the capacitors discharges below the battery pack voltage, then the voltage displays then drop to the battery pack voltage. One time, when I turn off the charger AC input power and lifted a battery link, a spark resulted between the link and the battery post. So for maximum safety, I install a contactor between the DC output of the charger and the battery. This stop the battery current feed back to the charger capacitors. This is what is exactly what happens with the Z1K motor controller. This controller has a capacitor bank in it, that maintains the voltage of the battery pack even after you let up on the accelerator peddle. As I coast down hill, the rpm circuit to the tachometer (which is program to AMP ON TACH mode) reads the motor ampere starting at 100 amps drop to 0 amps as the RPM of the motor drops. At this time, the battery ampere reads O amps the external motor amp meter reads O amperes. Only the AMP on TACH reads this ampere. Roland -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20131125/ca3ea4ef/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)
