Yeah, I've seen this happen, but usually it indicates something got pretty hot. Is your system sized properly, and you should always use belleville washers on high-current carrying terminations. With temperature rise, the bolt/stud can lengthen which will reduce torque and increase resistance. Also, With repeated cycling it can loosen.
NEVER use split washers!!!! https://www.ecmweb.com/content/article/20890080/how-to-use-belleville-washers-correctly On Fri, Dec 16, 2022 at 7:39 AM Tom Jones via EV <ev@lists.evdl.org> wrote: > Thanks Cor, > That reminded me that the only time I have used "Marine grade" heat > shrink was in that box. That tubing does have an adhesive lining. That > must have been what migrated. > Tom > > On 12/15/2022 8:01 PM, Cor van de Water via EV wrote: > > Tom, > > Did you use heatshrink on the cables? > > I know of many types of Heat Shrink that has heat activated glue > > inside to adhere to the cable it is crimped onto, maybe that glue > > migrated to the wire strands? > > Alternatively, maybe the cable insulation expelled something, possibly > > under high temp, which then dried on the connections? > > Cor. > > > > On Thu, Dec 15, 2022 at 2:10 PM Tom Jones via EV <ev@lists.evdl.org> > wrote: > >> I have a conversion that has been on the road since 2009. It has a Zilla > >> 1kLV and a Warp9 for propulsion. The traction pack consists of 44 CALB > >> 180 Ah cells for about 150 volts. > >> > >> The Zilla, hairball, two contactors, breaker and a shunt have been in an > >> aluminum box for all those years. I recently had reason to open the box > >> and check connections and see if there was anything going wrong. The box > >> is not water tight but the contents were dry and generally very clean, > >> there were no signs of any problems. > >> > >> When I took apart some of the high current connections, I found them to > >> be covered with a very sticky clear film. That film was very hard to > >> remove. Acetone and a lot of rubbing did a fair job of cleaning the > >> contacts. But, it was not easy. Only the high current contacts had this > >> problem. Inside the box, no other surface had the sticky film. > >> > >> So, here is my question, does anyone on this list have any idea about > >> how that sticky film developed? Or, has anyone else ever seen this > issue? > >> > >> Tom Jones > >> -------------- next part -------------- > >> An HTML attachment was scrubbed... > >> URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20221215/4513b3eb/attachment.htm > > > >> _______________________________________________ > >> Address messages to ev@lists.evdl.org > >> No other addresses in TO and CC fields > >> HELP: http://www.evdl.org/help/ > >> > > _______________________________________________ > > Address messages to ev@lists.evdl.org > > No other addresses in TO and CC fields > > HELP: http://www.evdl.org/help/ > > > > _______________________________________________ > Address messages to ev@lists.evdl.org > No other addresses in TO and CC fields > HELP: http://www.evdl.org/help/ > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20221216/0d59c74d/attachment.htm> _______________________________________________ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
