The Delta HES system assists the VFD-VJ series AC motor drive, a servo motor, fixed displacements pump and pressure sensor. The host controller sends pressure and flow commands via an analog signal (0-10V) to the VFD-VJ series and then the VFD-VJ series controls the servo motor, fixed displacement pump and pressure sensor with precise pressure and PID control functions. This system provides fast response and high reduplication accuracy to the machinery and also supports the convergent flow of a multiple pumps connection.