3-12 Powermax105 Operator Manual
Understanding 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 Powermax105:
• At 105 A (480-600 V CSA, 400 V CE, 380 V CCC), the arc can remain on for 8 minutes out of 10 minutes
without causing the unit to overheat (80% duty cycle).
• At 94 A (480-600 V CSA, 400 V CE, 380 V CCC), the arc can remain on for 10 minutes out of 10 (100%).
See the Specifications section for a complete list of duty cycle specifications.
If the duty cycle is exceeded, the power supply overheats, the temperature fault icon appears in the status screen,
the arc shuts off, and the cooling fan continues to run. You can not resume cutting until the temperature fault icon
disappears and the fault LED goes off.
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