Every machine is equipped with protect travel switch in order to increase safety coefficient for repairing and maintenance. It also has thermal overload relays to protect the motor.
每台机器均配有保护行程开关，为维修、保养增加一份安全系数。且装有热过载继电器，保护电机。
2
So the overload control of MGW in Soft-Switch researched in this paper is a kind of feedback model for service traffic control mechanism which is composed by MGW and MGC together.