Hi Sydney, Thanks so much for your videos. I’m a 77 year old guy putting twin Tesla Model 3 motors with LFP battery packs into a 42 foot aluminum catamaran fly bridge boat custom made in 1990 in Australia. I’m having problems with contactors not closing: errors a_071 Transcon not met, a_081 /sw /Ctr close blocked, a_083 sw Ctr close failure. I have connectors attached to all 3 receptacles (Penthouse to Motor, Penthouse to HVAC and Penthouse to ChargePort. I also have all cover bolts tight in place. LFP Battery pack has no front motor receptacle. Do you have a suggestions to resolve the failure? Thanks!!!!
Hey. That sounds like an amazing project! Those errors basically only tell you that it isn't happy (but not why). A_071 is: "A blocking condition does not allow the BMS to transition into the requested state." How is everything hooked up? Are you running both motors and batteries seperately? A couple of ideas - first thing to check if your pyro fuses aren't blown (~$25 from Tesla). Make sure that the penthouse lid is grounded (or the 2 screws either side of the battery logic plug ar grounded). Check your HVIL's (you can see how in my video #12 sorting problems). You will need the motor plugged in to the high voltage so that the system can pre-charge (i.e. if it's not connected to the capacitors in the motor inverter it wont work). A few things to try there.
