Hi all, I asked this question in anther thread as part of a larger issue but think it may be best to be a separate topic as I cannot be the only person with this question.
I have a REC Q BMS which I opted not to buy the pre-charge relay for. There is no documentation on how to wire the contactor to the BMS w/o the pre-charge circuit.
The pins on the BMS which the pre-charge relay would connect to are labelled "emitter" and "collector". I know these are legs of a transistor and doing some research, it sounds like the current flows through the collector, gets amplified and sent out the emitter. In this application, do I just feed the collector with +24v from my battery pack and drive the contactor from the emitter output? Will this just act as an open/closed circuit when the BMS wants to open/close the contactor?
Do I need an additional relay in between the contactor and BMS and NOT drive the contactor directly from the output of the emitter?
I wish there was better documentation on this. I'm leaving for a trip on Thursday and this is one of the last pieces of my puzzle. Any help from anyone familiar with the REC BMS products would be appreciated.