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Operation
Performance Data Plate and Duty-Cycle
On the machine, there is a plate that includes all the operating specifications for your new unit. The serial number
of the product is also found on this plate.
The duty-cycle rating of a machine defines how long the operator can weld and how long the machine must rest
and be cooled. Duty-cycle is expressed as a percentage of 10 minutes and represents the maximum welding time
allowed. The balance of the 10-minute cycle is required for cooling.
For example, a machine has a duty-cycle rating of 30% at the rated output of 90A. This means with that machine,
you can weld at 90A output for three (3) minutes out of ten (10) with the remaining seven (7) minutes required for
cooling. The duty-cycle of your new machine can be found on the data plate affixed to the machine. It looks like the
diagram below. Referring to the sample below, the "X" row lists duty-cycle percentages while the "I
amp draw corresponding to the duty-cycle. Various duty-cycles at other amperages are listed on your data plate.
The data plate also shows the rated input amperage (I
and input amperage) for both 15 and 20A breakers. Be sure to pay close attention to the breaker on the circuit the
machine is plugged into and follow the appropriate ratings. User settings on the machine may need to be reduced
or limited to avoid exceeding the rated input amperage. Failure to do so could result in frequent breaker trips or
electrical hazards.
20
Forney Industries
2057 Vermont Drive, Fort Collins, CO 80525
Flex
30 Plasma ST
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