Delta has developed an inverter-driven hydraulic power solution for a client in central China. The solution keeps the strength of the hydraulic power unit while increasing energy efficiency with a fast pressure response. To meet the specific needs of hydraulic power units, the solution adopts and customizes Delta’s Vector Control Drive. Users can read the voltage, current, and power consumption data on the Power Meter DPM Series. They can also easily adjust parameters and monitor system data through the Human Machine Interface DOP-100 Series. 

It is worth noting that the Vector Control Drive, actuating the permanent magnetic motor, can automatically change the rotation speed for different pressures to meet the needs of transient states and the pressure holding process as detected by the sensor. Compared to variable pumps, this feature provides higher stability and better energy efficiency. The solution brings the following benefits for the client:
Advanced multi-stage PID control automatically adjusts motor rotation speed: The Vector Control Drive has a built-in PLC to perform multi-stage PID control in response to the constantly changing pressure level. This feature of high controllability can not only provide fast pressure response, but it can also slow down the motor’s rotation speed during the pressure holding process.
Production costs reduced by avoiding unnecessary energy waste: The Vector Control Drive can automatically control the motor rotation speed to operate at a lower speed when the condition allows for minimizing energy consumption. Reducing the unnecessary high-speed operation of the motor minimizes temperature rises and extends motor lifespan.
Built-in PLC reduces solution costs: The built-in PLC of the Vector Control Drive saves the costs of adopting an external PLC.

This solution provides the advantages of hydraulic power units while overcoming the challenges of pressure response. By controlling the motor rotation speed, the Vector Control Drive can perform fast pressure response with high stability to allow higher energy efficiency. By avoiding unnecessary high-speed operation, the lifespan of the power unit can be extended. Overall, the solution allows a significant increase in machine performance with reduced costs.