Duty Cycle; Specifications - Thermal Arc Fabricator 251 Operating Manual

2.08 Duty Cycle

The rated duty cycle of a welding Power Supply is the operating time it may be used at its rated output current without
exceeding the temperature limits of the insulation of the component parts. To explain the ten minute duty cycle period
the following example is used. Suppose a welding Power Supply is designed to operate at 60% duty cycle, 250
amperes at 26.5 volts. This means that it has been designed and built to provide the rated amperage (250A) at the
rated load voltage (26.5V), for 6.0 minutes out of every 10 minute period (60% of 10 minutes is 6.0 minutes). During
the other 4.0 minutes of the 10 minute period the Power Supply must idle and be allowed to cool. The thermal cutout
will operate if the duty cycle is exceeded.

2.09 Specifications

Control Circuit Supply
Wire Drive Motor Supply
Wire Speed Range
Wire Diameter
Mild Steel:
Stainless Steel:
Aluminum:
Flux Cored:
Wire Spool Size Capacity
April 28, 2006
MIG Gun Specifications
Gun Catalog Number 43340
Gun Type TWECO Weldskill 300 Amp
Gun Cable Length 15 ft (4.5m)
Table 2-2: MIG Gun Specifications
Wire Drive Specifications
.023"
(0.6mm)
Y
Y
44 lb, 33 lb, 10 lb, 8" and 12" wire spool sizes.
Table 2-3: Wire Drive Specifications
30VA @ 24VAC
180VA @ 14 to 46VDC
80 to 800 ipm
(2 to 20 m/min)
.030" .035"
(0.8mm) (0.9mm)
Y Y
Y Y
Y Y
Y Y
FABRICATOR 251
.045"
(1.2mm)
Y
Y
Y
Y
2-3