50 Powermax125 Service Manual 808070
3 – Basic System Operations
Understanding duty-cycle limitations
The duty cycle is a percentage of time out of 10 minutes that a plasma arc will remain on when operating at an ambient
temperature of 40° C (104° F). For example, if the system runs for 6 minutes before overheating and cools off enough to
produce an arc in less than 4 minutes, it has a 60% duty cycle.
If 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 cannot resume cutting until the temperature fault icon disappears and the fault LED goes off.
The fan may run during normal operation of the system.
With a Powermax125:
At 125 A (480/600 V CSA, 400 V CE, 380 V CCC), the arc can remain on for 10 minutes out of 10 minutes without
causing the unit to overheat (100% duty cycle).
If you are operating the power supply using a lower-rated power plug or service, turn
down the current (amperage setting). See Decrease output current for lower-rated power
plugs on page 33.
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