What model contactor are you using with the Curtis 1238?
How do you have the contactor coils wired (please draw it out so we can help you)? Give all pin numbers and descriptions for the Curtis 1238.Thank you for your reply. I've had a little time since my post to think some more and research.
I have an LEV200A5NAA. It says it is a 24V coil, but looking at the manual for the Curtis, the KSI and the coil return is Max(108)V +10V. Maybe the controller can't open the coil anymore after some age/oxidation? It is possible that I had the coil return on the wrong side of the contactor coil. The manual says it should be on the positive side of the contactor however, it was working for a short time for some test runs and then stopped after I let my pack sit for balancing.
On my previous build (where I harvested all my parts), I had a regular relay rated for 240Vac for the KSI. This time around, I was using a SSR DC-DC and tried to use the BMS relay control for charge and discharge with a 12V from the key switch, but I kept getting the error 39 from my controller. It would work when I just grounded my SSR rather than use the sink in the BMS.
So here is a follow up question to my original problem. Which way should the current flow through the contactor? I had it connected going from the battery+ to +A1 to -A2 to B+1238. Then the coil return was connected on the -A2 (coil control) side of the contactor.
I can't remember how it was on my previous build.