Duty Cycle - Thermal Arc Fabricator 211i Operating Manual

INTRODUCTION

2.08 Duty Cycle

The rated duty cycle of a Welding Power Source, is a statement of the time it may be operated at its rated welding
current output without exceeding the temperature limits of the insulation of the component parts. To explain the
10 minute duty cycle period the following example is used. Suppose a Welding Power Source is designed to oper-
ate at a 20% duty cycle, 210 amperes at 24.5 volts. This means that it has been designed and built to provide the
rated amperage (210A) for 2 minutes, i.e. arc welding time, out of every 10 minute period (20% of 10 minutes is
2 minutes). During the other 8 minutes of the 10 minute period the Welding Power Source must idle and allowed
to cool. The thermal cut out will operate if the duty cycle is exceeded.
100
90
80
70
60
50
40
SAFE OPERATING REGION
30
20
10
0
0 10 20
100
90
80
70
60
50
40
SAFE OPERATING REGION
30
20
10
0
0 10
Manual 0-5225
(MIG, TIG & STICK)
30 40 50 60 70 80
Welding Current (AMPS)
Figure 2-2: Fabricator 211i Duty Cycle on 230VAC
STICK
(MIG, TIG & STICK)
20 30 40 50 60
Welding Current (AMPS)
Figure 2-3: Fabricator 211i Duty Cycle on 110VAC
FABRICATOR 211i
90 100 110 120 130 140 150 160 170 180 190 200 210 220
70 80 90 100 110 120 130 140 150
2-3
FABRICATOR 211i
STICK / TIG
MIG
Art # A-10935
FABRICATOR 211i
TIG
MIG
Art # A-10936
INTRODUCTION