The M3 is spindle enable and requires you to manualy start the spindle. After the spindle is started the auxilury contacts on the starters (contactors) will turn on CR2 which will turn on the lube pump and input to the K5 XDI connector. Once the control sees the input you can hit cycle start and it should continue running the program.
If for some reason the spindle should stop during M3 the program will be halted. M5 should stop the spindle if running.