To expand a little on what has gone before, if you have a 220vAC unit there and are in N.A. you will connect each 120v line of the 240v supply. one to L and one to N.
If in N.A. in this case the neutral is not connected.
Other parts of the world one one side of the 240v is neutral unlike N.A. where the centre tap in neutral.
Also check to see if you have a 120v-240v jumper in the supply, if so you may be able to run on 120v.
Common usually refers to the -ve side of the DC supply.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.