2. Wiring diagram of emergency stop button switch with fuse and contactor (simplest case)
III. Wiring diagram when emergency stop button, fuse, contactor and thermal relay are used together.
Four: emergency stop switch, leakage circuit breaker, contactor and thermal relay operation line control.
The basic function of the extended data emergency stop button is to stop in an emergency to avoid mechanical accidents or personal accidents. However, due to the long-term operation of the machine, the line, especially the emergency stop line, may fail and open.
At this time, if the emergency stop button uses normally open contacts, the line fault in the emergency stop part will not be found, and it will be too late to find it when the emergency stop button is used.
When normally closed contacts are used, when the circuit of the emergency stop part fails, the machine stops at most, and the loss is relatively small.