220-240 is standard, I'd say 230 falls about dead-center!

The instructions should have a normal operating range listed, and 240 should be in there....

 

Assuming nothing weird has happened in the last few months, it should take a NEMA 6-50R receptacle at the wall for it to plug into.

Unless you've got some really wonky voltage at your house or shop, it should operate fine on 220-240V.

 

240V is a 'system' or distribution voltage. 220V & 230V are what equipment are rated for.

That's how its done because some voltage drop is unavoidable, and thus, being designed around the lesser voltage, ensures optimal performance in normal installations.

The 240V you measure at the receptacle is without a load. While laying a heavy bead, you can be sure it dips a little.

EDIT: 120/208V 3Ø is an exception. Equipment that is compatible will be explicitly marked 200V or 208V. While a 220-230V rated machine will most likely run, it will be short on torque, exhibit high current draw, and ultimately - a reduced lifespan.

 

Also most (really all) rated equitment is designed to run +-10% of spec due to all the uncontrollable variables. Granted, like said above, it's not supposed to run in that 10% area, but it can.