question

Hi @Rob Howdle,

The (dis)charge current needs to be at 40A or less before the contactor opens. This is to protect the contactor.

FWIW, there is always a 2 second delay for the contactor to open, which you also need to take into account.

>>Presumably the BMS 500 isn't intelligent enough to command external loads (such as a Quattro/Multi) via VE.Can -> Cerbo -> VE.Bus<<

It depends on how the loads and chargers are controlled, via ATC/ATD or DVCC. For ATC/ATD it is the Lynx Smart BMS in command, for DVCC it is the GX device in command (which receives DCL and CVL from the Lynx Smart BMS).

edit: in case the Multi/Quattro is late in replying the DVCC request, there is a timeout of 20s, which is what you are experiencing.

Hi @Stefanie and thanks for your response,

Loads/chargers will be controlled by DVCC. I am confident that the majority of equipment will shutdown (even if there is a 20 second delay), however, I am also powering a 48V motor used for propulsion. So, it would appear that if the motor was consuming >40A and the Remote On/Off was OPENED, nothing would happen until motor current became <40A. The reason I am investigating this, is that I was potentially looking to use the Rem On/Off as a form of isolation - but it appears it can't be relied on, under certain conditions. I fully understand the need to protect the contactor, but this then removes the option for operator isolation of the system. I will need to look at interlocking the 48V propulsion system with any potential shutdown of the Lynx 500.

Many thanks.

Rob