User Responsibility; Duty Cycle; Specifications - Thermal Arc Fabricator 281 Service Manual

FABRICATOR 281

2.07 User Responsibility

This equipment will perform as per the information
contained herein when installed, operated, maintained
and repaired in accordance with the instructions
provided. This equipment must be checked periodically.
Defective equipment (including welding leads) should
not be used. Parts that are broken, missing, plainly
worn, distorted or contaminated, should be replaced
immediately. Should such repairs or replacements
become necessary, it is recommended that such repairs
be carried out by appropriately qualified persons
approved by Thermal Arc Advice in this regard can be
obtained by contacting Thermal Arc.
This equipment or any of its parts should not be
altered from standard specification without prior
written approval of Thermal Arc. The purchaser of
this equipment shall have the sole responsibility for
any malfunction which results from improper use or
unauthorized modification from standard specification,
faulty maintenance, damage or improper repair by
anyone other than appropriately qualified persons
approved by Thermal Arc.
Control Circuit Supply
Wire Motor Supply
Wire Speed Range
Wire Diameter
Mild Steel:
Stainless Steel:
Aluminum:
Flux Cored:
Wire Spool Size Capacity
INTRODUCTION

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 50% duty cycle, 250 amperes at 28 volts. This means
that it has been designed and built to provide the rated
amperage (250A) at the rated load voltage (28V), for
5.0 minutes out of every 10 minute period (50% of 10
minutes is 5.0 minutes). During the other 5.0 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

Gun Catalog Number 43340
Gun Type
Gun Cable Length
Wire Drive Specifications
.023" .030"
(0.6mm) (0.8mm)
Y Y
Y Y
Y
Y
44 lb, 33 lb, 10 lb, 8" and 12" wire spool sizes.
Table 2-3: Wire Drive Specifications
-4
MIG Gun Specifications
TWECO Weldskill 300 Amp
15 ft (4.5m)
Table 2-2: MIG Gun Specifications
30VA @ 32VAC
216VA @ 36VAC
80 to 800 ipm
(2 to 20 m/min)
.035" .045"
(0.9mm) (1.2mm)
Y Y
Y Y
Y Y
Y Y
1/16"
(1.6mm)
Y
Y
Manual No. 0-4880B