Did you check that there was no short? Most cases, an isolation fault will be reported when something (like the back of the board holding the fuses) gets wet, which would happen before a dead short that would blow the fuse. Capacitance that causes an inrush can certainly be an issue, though I would be worried about the caps themselves, if it is able to blow a 60A fuse!
Cor van de Water Chief Scientist Proxim Wireless Corporation http://www.proxim.com Email: [email protected] Private: http://www.cvandewater.info Skype: cor_van_de_water Tel: +1 408 383 7626 -----Original Message----- From: EV [mailto:[email protected]] On Behalf Of Al via EV Sent: Sunday, December 21, 2014 8:16 PM To: Electric Vehicle Discussion List Subject: [EVDL] Fuse blew, not sure why. I got stranded because a fuse blew in my battery box that effectively disconnected the DC to my charger. My EV is a US Electricar S10 pickup with 3 phase AC controller. System voltage ~320VDC. I have a contactor in the battery box that supplies pack voltage to the Manzanita PFC40 charger, a 3kW resistance water heater and a Masterflux BLDC A/C compressor controller. Each of the 3 units have their own separate fuse built in. The line is fused before the contactor by an A50QS60 500VDC 60A semiconductor fuse. The fuse never sees more than 30A continuous, usually much less. The only downside to this arraingment is that the charger and BLDC controller always have pack voltage on them when driving or charging. The fuse has been in service for about 2 years. Could the capacitor inrush current of the charger and BLDC controller, every time the contactor energizes to drive or charge, have caused the fuse to gradually fail? Wouldn't the "local" lower value fuses have blown first? I don't think the Manzanita chargers have a lot of capacitance on the output and the BLDC controller has a few fairly small electrolytics on the input. What say the group? Thanks, Al _______________________________________________ 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) _______________________________________________ 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)
