极限开关：吊上吊下都有极限开关部件，防止链条超出确保安全。
Limit switch: using limit switch component in designation to protect chain and ensure and security.
固态功率控制器由控制和逻辑部件、固态开关部件和电流感受部件组成。
The SSPC is composed of control and logic device, solid-state switch device and current-sense device.
固态开关部件采用电力MOSFET做软开关，使得电路通断时，不会出现打火花的现象。
The solid state switch device uses power MOSFET as soft switch, so, the spark doesn't appear when the circuit turn on or turn off.
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