operation
4-6 powermax
45
Operator Manual
Check the indicator LEDs
Verify that the green power ON LED on the front of the power supply is illuminated, that the gas pressure LED shows a
green bar in the center of the gauge, and that none of the other LEDs are illuminated or blinking. If the temperature,
torch cap sensor, or fault LEDs are illuminated or blinking, or if the power ON LED blinks, correct the fault condition
before continuing. See Basic troubleshooting in the Maintenance and Repair section for more information.
Attach the work clamp
The work clamp must be attached to the workpiece while you are cutting.
Note: If you are using the Powermax45 with a cutting table, you can ground it through the table instead of using
the work clamp. See your table manufacturer’s instructions for more information.
• Ensure that the work clamp and the workpiece make good metal-to-metal contact.
• For the best cut quality, attach the work clamp as close as possible to the area being cut.
• Donot attach the work clamp to the portion of the workpiece to be cut away.
When the power ON LED is illuminated, none of the other LEDs are illuminated or blinking, the gas pressure LED
indicates pressure is in the correct range, the amperage knob is set, and the work clamp is attached, the system is ready
for use.
Understand duty-cycle limitations
The duty cycle is the amount of time, in minutes, that a plasma arc can remain on within a 10-minute period when
operating at an ambient temperature of 40°C (104°F). With a Powermax45:
• At 45A, the arc can remain on for 5minutes out of 10minutes without causing the unit to overheat (50%duty
cycle).
• At 41A, the arc can remain on for 6minutes out of 10 (60%).
• At 32A, the arc can remain on for 10minutes out of 10 (100%).
If the power supply overheats because the duty cycle is exceeded, the temperature LED will illuminate, the arc will shut
off, and the cooling fan will continue to run. To resume cutting, wait for the temperature LED to extinguish.
The next section explains how to operate the hand torch. To use the machine torch, see How to use the machine torch
on page 4-12.
Work clamp
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