Strange ... because the main goal of Chademo CanBus protocol is to restrict the voltage of the station (390v from 0-84% and 394v from 84-94% for the Soul EV).
So, when you use the 600v DC supply ... the Chademo PWM command restrict the output at the builder level.
And so when you plug an eBus 600v to 500v DC Chademo ... it don't like that.
(but chademo don't allow to open the power wire because of the invalid voltage mesure).EDIT :
see the LOGS in the vidéo = voltage restrict to 394v.
the 2 wire from the side of the fan is for this, i think ... to command the voltage of the supply by PWM in the Chademo Control Box.
Cool to see that we have a DC supply that it can have a wide range of voltage setting ... not usual at high current (90-450v like i see in the config file on the right).