Simple elevator control circuit

The layout of control components and signaling equipment on each layer is shown in Figure 8-16. This line can be used to
transport goods in factories and warehouses or to transport meals in restaurants. It is simple to operate, safe and reliable. The meanings of the component
codes     in Figure 8-15 and Figure 8-16 are shown in Table 8-10. In the figure, the door switch ISA-4SA is used to ensure that the elevator     can be started when the doors on all floors are closed ; the end limit switches SQi and sQ2 are used to prevent the contact from sticking to the car and causing an accident after the contactor loses power and the car exceeds the end point.