The oil pump test bench is used as an important equipment for the school pump. The speed regulation requirements for the frequency converter are also strict: the frequency converter has a high torque output in the speed regulation process, the operation speed is stable, and the speed change of the motor is small when the load is suddenly increased. This requires the inverter to automatically detect changes in the motor during the speed regulation process, adjust the torque output for torque compensation and speed compensation, reduce the motor speed change, and ensure a higher torque output due to the test pump. When the load changes rapidly, and the inertia of the equipment is large, this requires higher requirements for the frequency converter: strong overload capacity and good braking performance.

Easy to control the frequency changer control characteristic: The easy to control the frequency changer is uses the VVC non-inductive electric current vector control, the VVC technology is above all, the electric current measurement method and the electrical machinery model have been improved. The current is decomposed into excitation and torque components, and the actual motor load can be calculated better and faster. Compensation for rapid load changes is now possible. High torque and precise speed control are also available at low speeds and even at rest. This kind of control can guarantee good torque control characteristics, and can guarantee smooth transition and strong torque protection during current limit operation. Main features of VVC control: Even at low speeds, accurate speed control is achieved; rapid response from the received signal to full torque output; good compensation for load kick; reliable out-of-step torque protection from normal operation mode to current in the magnetic field It can also be realized when weakened; the motor data has a strong adaptability when it changes.

Easy-to-control inverter has dynamic torque compensation and slip compensation. Torque dynamic compensation function: not only make the EC3000 series inverter output 180% torque at low speed 1HZ, ensuring good low frequency operation characteristics, but also can dynamically adjust the torque output to increase the torque response at constant speed, compared with ordinary inverter Voltage compensation is performed only during acceleration, and torque response performance is significantly improved. Slip compensation: When the motor load is heavy, the slip will be larger. By setting the motor no-load current, slip gain, and compensation time, the motor slip can be reduced and the motor speed can be increased to meet the requirements of the control system.

The oil pump test bed is mainly composed of several parts, such as motor drive device, fuel oil circuit and adjusting device, computer measuring and controlling device and measuring device. According to the requirements of the test bench and the characteristics of the easy-to-control inverter (EC3000), the main setting parameters are as follows:

A02=3 or 5 3 represents external terminal operation, frequency FV terminal is given; 5 represents external terminal operation, frequency is given by communication

A07=380V input voltage

A09=380V rated voltage

A10=133HZ highest frequency

A11=380V maximum voltage

C12=1.1 Torque compensation

C15=0.5 Slip gain

C17=1.0S slip compensation delay

After the test, the effect of the easy-to-control converter applied on the oil pump test bench can be comparable to that of imported frequency converters. Easy to control inverter 18.5 KW (including 18.5 KW) below, built-in braking unit, according to the requirements of the braking situation, with external braking Resistor. For other parameter settings, refer to the instruction manual of EC3000 Universal Vector Converter.