switch off the motor

You must turn off the switch when anything goes wrong with the motor.

如果电动机有什么毛病时，你必须关掉开关。

You must turn off the switch when things goes wrong with the motor.

假若电念头有什么毛病时，你必需关掉开关。

When the arm runs to the upper and lower two limit position, respectively press the lower limit switch, cut off the main control circuit, variable amplitude motor parking, to limit the role.

当臂杆运行到上下两个极限位置时，分别压下限位开关，切断主控电路，变幅电机停车，达到限位的作用。