Operate the Plasma System
Powermax65/85/105 SYNC Operator Manual 810470 83
Prevent overheating
The duty cycle ratings help you to know how to operate a Powermax system without overheating it.
Duty cycle – Percentage of time during a 10-minute interval that a plasma arc can stay on without
causing the plasma power supply to overheat.
For a complete list of duty cycle specifications for all of the plasma power supply
configurations, refer to the following sections:
Powermax65 SYNC: Refer to Powermax65 SYNC on page 24.
Powermax85 SYNC: Refer to Powermax85 SYNC on page 26.
Powermax105 SYNC: Refer to Powermax105 SYNC on page 28.
Table 14 – Duty cycle example for a Powermax65 SYNC
If you cut for more than the recommended duty cycle and the plasma power supply overheats, the
following occurs:
The plasma arc stops.
The temperature fault icon comes on.
The cooling fan inside the plasma power supply continues to operate.
When the plasma power supply overheats, do the following:
Leave the plasma power supply on to let the fan cool the plasma power supply.
Wait for the temperature fault icon to go off before you start to cut again.
Decrease arc stretch
Stretching the plasma arc for long periods
decreases the duty cycle. Whenever possible,
drag the torch on the workpiece. Refer to Start
a cut from the edge of the workpiece on
page 99.
If you operate the plasma power supply on a
lower rated electrical service, stretching the
plasma arc for long periods can cause the
plasma power supply to overheat more quickly
and can cause the circuit breaker to open (trip).
Output current Duty cycle*
Powermax65 SYNC
65 A 50%
46 A 100%
* Assumes ambient operating temperature of 40°C (104°F).
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