a control device for use with a plastics processing machine , e . g . an injection molding machine , includes a housing which is constructed for protection against ingress of water in compliance with the ip code and accommodates a heat source such as a cpu unit or a display unit . a cooling system is provided for dissipating heat generated by the heat source and includes a pump for pumping a coolant , at least one cooling element arranged inside the housing , a cooler provided outside the housing , and a coolant circuit for circulation of the coolant . the coolant circuit fluidly connects hereby the pump , the cooling element and the cooler with one another .