3BDH000364R0002 PM783FB0 According to a large number of studies and experiments, the maximum acceleration acceptable to human beings is am≤1.5m/s2, and the rate of change of acceleration ρm≤3m/s3, and the ideal running curve of the lift can be classified into triangular, trapezoidal, and sinusoidal according to the acceleration, because it is more difficult to realise the sinusoidal acceleration curve and the maximum acceleration and the rate of change of acceleration at the turning point of the triangular curve are greater than that of trapezoidal curve, i.e., +ρm jumps to -ρm or from -ρm jumps to +ρm. Due to the difficulty in realising the sine wave acceleration curve, the maximum acceleration of the triangle curve and the acceleration change rate at the turning point of the starting and braking section are greater than that of the trapezoidal curve, i.e. the acceleration change rate of +ρm jumping to -ρm or from -ρm jumping to +ρm, so it is seldom adopted, and because the trapezoidal curve is easy to realise and there are frequent indicators of the change rate of the good acceleration, so it is widely adopted.

3BDH000364R0002 PM783FB0 is specially designed for the requirements of flexible speed regulation, control and high-precision levelling of the lift and other requirements of the lift special frequency converter, which can be equipped with general three-phase asynchronous motor, and has intelligent software, standard interface, menu prompts, input lift curves and other key parameters and other functions. It has the functions of convenient and quick debugging, automatic single and multi-layer function and automatic optimisation of deceleration curve, the speed control system composed of it has less creeping time and short levelling distance, no matter it is a double-winding motor or a single-winding motor can be applied, and its maximum design speed can reach 4m/s. Its unique computer monitoring software can choose serial interface to realise the non-contact control of the input/output signals. The inverter can be used to control the elevator system without contact.

3BDH000364R0002 PM783FB0 The lift system composed of frequency converter, when the frequency converter receives the call ladder direction signal from the controller, the frequency converter starts the motor according to the set speed and acceleration value, reaches the maximal speed and then runs at a constant speed, and when it reaches the deceleration point of the destination floor, the controller sends out the cut-off high-speed signal, and the frequency converter reduces the maximal speed to the crawling speed at the set deceleration speed. In the process of deceleration, the frequency converter can automatically calculate the distance between the deceleration point and the levelling point, and calculate the optimization curve, so that it can run according to the optimization curve, so that the low-speed crawling time is shortened to 0.3s, and in the process of levelling the lift, the frequency converter adjusts the levelling accuracy by adjusting the levelling speed or the braking slope.