Hi sir:
Assuming that Gto 52 is 1 color, test the following:
1) test the main fuses E3, if are o.k, open, or loose, or dirty.
2) look if the 3 phases are in the input and output of Fuses?
3) Reset the overload A2, and tight the wires, look for corroded, or dirty, oil, and see if the contacts are o.k, clean it or replaces, look if there 3 phases are in the input and output.
4) if everything is o.k look is contactor Y is coming and then D ??? Look if the contactor D2 is closed for to activate the contactor D Y (start)
5) If is o.k see if there 3 phases are in the main terminals of main motor: 380Vca, or 220Vca, or 400Vca, whatever voltages that you use in his country.
Let me know