Connection requirements for electrical power

Use the Hypertherm® input current ratings to determine conductor sizes for power connection and installation instructions.

The Hypertherm ratings are designated HYP on the data plate on the bottom of the plasma power supply. Use the higher HYP input current value for installation purposes. Refer to System specifications on the data plate for a sample data plate.

Notice

MAKE SURE THAT CIRCUITS HAVE PROTECTION

Supply each circuit with appropriately sized time-delay fuses and a line-disconnect switch.

The maximum output voltage changes related to input voltage and the circuit’s amperage. Because the current draw changes during startup, time-delay fuses are recommended. Time-delay fuses are resistant to currents up to 10 times the rated value for short periods of time.

Notice

DO NOT USE PHASE CONVERTERS FOR 3-PHASE POWER

Do not use phase converters to supply 3-phase power to your Powermax plasma power supply.

The warranty from Hypertherm does not include system damage that is a result of unsatisfactory or defective power quality from phase converters or incoming line power.

Use a line-disconnect switch for each plasma power supply so that the operator can stop the incoming power quickly in an emergency.
Put the switch in a location where the operator can get access easily. A licensed electrician must install the power switch according to national and local codes.
The interrupt level of the switch must equal or be more than the continuous rating of the fuses.
The switch must also do the following:
- Isolate the electrical equipment and disconnect all live conductors from the incoming supply voltage when in the OFF position.
- Have one OFF and one ON position that are clearly marked with O (OFF) and I (ON).
- Have an external operating handle that can be locked in the OFF position.
- Contain a power-operated mechanism that operates as an emergency stop.
- Have approved time-delay fuses installed. Refer to Voltage configurations for recommended fuse sizes.