Die-casting machine with a valve diagnosis system

Injection assembly of a die-casting machine, comprising:

• an injection piston controllable in translation to operate on cast molten metal in a mold of the die-casting machine, and a main pressure chamber for containing and pressurizing a fluid for translation of the injection piston;
• a multiplier piston controlled hydraulically to increase a fluid pressure in the main pressure chamber;
• a plurality of valves to manage an advance and a return of the injection piston and of the multiplier piston, wherein the plurality of valves comprises at least one of a proportional feed valve, an injection return drain valve, an injection return valve, a proportional injection drain valve, a multiplier release valve, a multiplier return drain valve, or a proportional main multiplier valve;
• at least one position transducer to provide electronic feedback of operation of the plurality of valves;
• an electronic control operatively connected to the plurality of valves and to the at least one transducer to control the opening and closing of the valves, the electronic control comprising a test management program configured to perform a plurality of diagnostic tests on the plurality of valves, wherein the test management program is configured to perform a test for each valve, in sequence, and to compare parameters detected during the test with a predefined range or with a threshold value;
• and
• a display to display the result of the diagnostic tests.