Resistance current value should less than the maximum current of the
ac drives dedicated brake unit, there is no other clear corresponding relationship for the
brake resistor selection with ac drives, the resistance value is chose according to brake torque primarily, and the power is chose through resistance value and utilization rate. But there is a principle that can't be violated: ensure the current flow on brake resistor must less than the allowed maximum current of the brake unit, that is R > 800/Ic, 800 means the maximum DC voltage of variable speed drive's dc control part, Ic means the maximum current of the
brake unit.
