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本系统采用廉价变频装置代替了高价变频器，提高了可靠性；用简单的比较法进行恒压液压调节，调试快，不用传统的PID调节器。
The system uses low-cost inverter instead of expensive inverter, improved reliability; with a simple comparison of constant pressure hydraulic adjustment, debugging faster, without the traditional PID regulator.