Elevator control cabinet installed in the traction machine next to the elevator is the electrical equipment and signal control center. In the early control cabinet, there were contactors, relays, capacitors, resistors, signal relays, power transformers and rectifiers, etc. With the development of computers and electronic technologies, elevator control cabinets became smaller and smaller and their functions became more and more powerful. The current control cabinet is generally composed of plc and inverter; however, there are some elevators with computer board control. PLC is actually a computer, mainly used for industrial field control. In some special circumstances, PLC performance more stable than the computer board. The level of modern elevators depends mainly on the advanced nature of the control cabinet.It reflects the size of the elevator function, the level of reliability and advanced level of intelligence.

The main functions of the control cabinet are: operation control and drive control.

Operation control

1.The call signal input and output processes and answers the call signal and starts the operation.

2.By communicating with passengers via registered signals, when the car arrives on a floor, car and direction of travel information is provided via visual signals of ringing and direction of arrival.

Drive control

1.According to the command information of operation control, it controls the car's start, acceleration (acceleration, speed), running, deceleration (deceleration), leveling, parking and automatic re-leveling.

2.Make sure the car is safe and reliable.

Control cabinet settings

1.General to enhance the height of the elevator below the average speed of the control cabinet of a ladder. It encompasses all the control and drive components.

2.Large lifting height, high-speed elevators, machine room elevators because of the hoisting machine power supply voltage is high, it is divided into signal control and drive control cabinet.

3.Group control ladder group dispatching has a special group dispatching dispatcher, there is no special group dispatching dispatcher, such as OTIS production without a special group control cabinet.