Forney 180 ST+ - Operation; Performance Data Plate and Duty-Cycle; Internal Thermal Protection System

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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 welder defines how long the operator can weld and how long the welder 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 welder has a duty-cycle rating of 30% at the rated output of 90A. This means with that machine,
you can weld at 90 A output for three (3) minutes out of 10 with the remaining seven (7) minutes required for
cooling. The duty-cycle of your new welder 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
2
” row lists the
amp output 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
1
) for a given input voltage (U
1
) There are ratings (duty-cycle
and input amperage) for both 15A 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.
(Example Data Plate)
If you exceed the duty-cycle of the welder, the thermal protection system will engage, shutting off all welder output.
After cooling, the thermal protector will automatically reset and the welding functions can resume. This is normal
and automatic behavior of the machine, and does not require any user action. However, you should wait at least
ten minutes after the thermal protector engages before resuming welding. You must do this even if the thermal
protector resets itself before the ten minutes is up or you may experience less than specified duty-cycle performance.
CAUTION: DO NOT REGULARLY EXCEED THE DUTY-CYCLE OR DAMAGE TO THE
WELDER CAN RESULT.
Operation
Internal Thermal Protection
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180 ST+
Forney Industries
2057 Vermont Drive, Fort Collins, CO 80525