SYSTEM AND METHOD FOR CONTROLLING OPERATION OF A HYDRAULIC SYSTEM OF A MINING MACHINE

摘要

The invention pertains to a method for controlling operation of a hydraulic system of a mining machine (100). Said hydraulic system comprises an electric motor configuration (230, 231, 232), a variable displacement pump configuration (240) configured to power at least one hydraulic consumer unit (CU1-CU6). The method comprises the steps of: - obtaining (s410) a desired operational displacement value (D1) relating to said variable displacement pump configuration (240); - determining (s420) a prevailing operational displacement value (Dcont) of said variable displacement pump configuration (240); - comparing (s430) said desired operational displacement value (D1) and said prevailing operational displacement value (Dcont); and - controlling operation (s440) of said electric motor configuration (230, 231, 232) by the basis of a result of said comparison, wherein controlling operation comprises 15 controlling a motor speed (RPM) of said electric motor configuration (230, 231, 232) so that said motor speed (RPM) is minimized while meeting a current power demand of said at least one hydraulic consumer unit (CU1-CU6). The invention also relates to a computer program product comprising program code (P) for a computer (210; 220) for implementing a method according to the invention. The invention also relates to a system for controlling operation of a hydraulic system of a mining machine and a mining machine (100) being equipped with said system.