1, according to the load torque characteristics of mechanical equipment selected Mitsubishi frequency; in practice often Equipment according to different load torque characteristics, divided into the following three categories: (1) constant torque load (2) constant power load ( 3) fluid load

2, according to the load control mode to select the appropriate characteristics of Mitsubishi inverter; Mitsubishi inverter control mode is divided into: V / f control, including open and closed loop; vector control, including no speed sensor and a speed sensor with the control; directly to torque control; disadvantages in three ways as follows:

(1) V / f open loop control advantages: simple structure, easy adjustment, can be used for general-purpose squirrel-cage induction motor; drawbacks: difficult to guarantee the low-speed torque, torque control can not be used, a small speed range; mainly occasions: Usually fan , pump energy-saving speed inverter or a motor drive with multiple applications.

(2) V / f control loop advantages: simple structure, high speed precision, can be used for universal asynchronous motor; drawbacks: difficult to guarantee the low-speed torque, torque control can not be used, a small speed range, to increase the speed sensor; mainly where: for maintaining the pressure, temperature, flow, PH value and other process applications.

(3) Speed Sensorless Vector Control advantages: does not require a speed sensor, torque response is good, simple structure, a wide range of speed control; disadvantages: the motor parameters need to be set, there must be an automatic test function; using occasions: general industrial equipment, most speed applications.

(4) the control vector with a speed sensor advantages: good performance torque control, the torque response is good, high-speed precision, speed control range; disadvantages: the motor parameters need to be set properly, automatic test function needs to be accurately speed sensor ; use: fine control of the torque and speed of the high dynamic performance applications.

(5) Direct Torque Control advantages: does not require a speed sensor, torque response is good, relatively simple structure, a large speed control range; disadvantages: the motor parameters need to be set, there must be an automatic test function; using occasions: fine control of the torque high dynamic performance applications, such as cranes, elevators, rolling mills and the like.

3, according to the use environment of use of different types of shield mounting structure Mitsubishi inverter; Mitsubishi inverter protective structure to adapt to the environment which it is mounted, it is necessary to consider the environmental factors as temperature, humidity, dust, pH, corrosive gases, and so Mitsubishi inverter whether long-term, stable, safe, reliable operation at stake.