The control system schematic shows that the retard blower motor is connected in parallel with the R6 retard grid when B1 contactor picks up the blower motor starts to work cooling the grids down.

• 从控制电路分析制动电阻栅冷却原理分析，电阻栅冷却风机与B1接触器控制电路上的R6电阻并联，当B1接触器闭合后，电阻栅冷却风机开始运转，起到冷却电阻栅的作用；