The screw size of the input terminal is as follows:
PCR1000LE: M4
PCR2000LE: M5
PCR3000LE, PCR4000LE and PCR6000LE (single-phase): M8
PCR6000LE (three-phase) and PCR9000LE: M5
For the details on how to connect the power cord, read the user’s manual – chapter of Checking the Package Contents and Connecting the Power Cord.