Most escalators use single-speed AC motors as the main engine, sprocket and chain drive, and the rated speed of the steps is mostly 0.5m/s. This kind of escalator still runs at rated speed even when there are no passengers, and has the disadvantages of high energy consumption, severe mechanical wear, and low service life. Before someone steps on the escalator, the elevator should run at a high speed and steadily. When there is no one, the escalator runs at a low speed. The system requires the inverter to start and run smoothly, with good acceleration performance, large starting torque, and strong overload capacity. At the same time, it should have the ability to automatically switch the control system to industrial frequency operation when the inverter speed regulation system fails to ensure the normal implementation of the escalator transportation function .

In the open loop vector control mode, it has the characteristics of large low-frequency starting torque and fast response speed. When starting at 0.5Hz, its output torque can reach 150% of the rated torque, which can fully meet the technological requirements of the elevator; the soft start function of the inverter It can eliminate the current impact when the motor starts; the inverter is a capacitive load, which can effectively improve the power factor of the motor and reduce reactive power loss; the inverter has a variety of electronic protection devices such as overcurrent, overvoltage, overload, and overheating, and has Abundant fault alarm output functions can effectively ensure the normal operation of the entire system; when there is no passenger flow, the elevator running speed is very low, and the mechanical wear is greatly reduced; the start, stop and speed conversion process of the frequency conversion drive system is smooth and comfortable, and it is more comfortable it is good. There are two working modes of "manual" and "automatic". When the inverter fails, it can still continue to run in manual mode.