The use of elevator inverter

    VVVF elevator inverter lift electronic control system includes the main controller, inverter and other hosts. MicroMaster440 series inverter is developed by Siemens Multifunctional inverter. It's rated power ranges from 0.12Kw to 75Kw (constant torque), using a modular design, compact structure, having a plurality of freely defined input and output points, to meet a variety of customer requirements. The inverters are microprocessor controlled and uses advanced technology with modern insulated gate bipolar transistor (IGBT) as the power output devices. Therefore, they have a high reliability and functional diversity. A pulse width modulation switching frequency is optional, which can reduce the operating noise of the motor. Full and complete protection for the inverter and the motor provides a good protection.

Control System Components

    Electric control system uses a table 15kw motor, an inverter 15kw MicroMaster440 units as the main driver. Inverter braking unit and braking resistor feedback when releasing the brake run mechanical energy. System is simple and reliable, more traditional control method saves installation space, and improve reliability. Smooth motor starting current impact is small. Mechanical shock is also greatly reduced, increased operating life. Inverter control via terminals through digital input terminals (DIN) ON/OFF1 command and given a fixed frequency reference. Through three relay output signals to the feedback current inverter operation status, received by the encoder template rotary encoder signals. Inverter using closed-loop vector control.

Operating principle and functions

    Elevator inverters are used in applications where higher-end transmission applications must use closed-loop vector control to achieve good control effect. Vector control is a theory first proposed by Siemens and the practical realization of the project first phase asynchronous motor control, has reached the level of DC motor control. It simulates the DC motor control torque of the motor current is divided into two directions, respectively, and the excitation control can be used for high-precision speed control, torque control. In order to avoid starting to slip, and to overcome the startup guide shoes and static friction between the rails is a good start to achieve comfort, you need to start the process, open the front brake that is applied to a very small additional speed setpoint to inverter, the brake open the motor is in apparent motion non-moving state to strictly follow the speed given curve, to ensure comfort.