OPERATION
powermax30 Operator Manual 4-11
Duty cycle and overheating
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 104° F (40° C). With a 120 V
input:
• At 30 A, the arc can remain on for 3.5 minutes out of 10 minutes without causing the unit to
overheat (35% duty cycle).
• At 23 A, the arc can remain on for 6 minutes out of 10 (60%).
• At 18 A, the arc can remain on for 10 minutes (100%).
With a 200-240 V input:
• At 30 A, the arc can remain on for 5 minutes out of 10 (50% duty cycle).
• At 24 A, the arc can remain on for 7.5 minutes out of 10 (75%).
• At 21 A, the arc can remain on for 10 minutes (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.
Common cutting faults
The torch does not cut completely through the workpiece. The causes can be:
• The cut speed is too fast.
• The consumables are worn.
• The metal being cut is too thick.
• The work clamp is not attached properly to the workpiece.
The arc sputters and consumables life is shorter than expected. The cause can be:
• Moisture in the gas supply.
PMX30_OM_04.qxp:PMX30_OM_04 10/7/09 12:45 PM Page 4-11
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