{Collins} 30S-1 230V wiring

I have been following the info on 230V connections to the 30S-1 and just
what is the right way to connect the 30S-1 to the 230V mains.  My 30S-1
came from the factory with the 230V AC cord included and connected at the
factory.  There are only 3 wires- white, black, green.  Why do you need a
4-wire connection when almost every other 230V appliance only uses 3
wires.  Help! I am confused.

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