Tweco 130i Transarc Service Manual - Manual (Page 19)

Manual 0-5282 3-1 AFETY AND INSTALLATION
TRANSARC 130i
3.01 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 operate
at a 25% duty cycle, 130 amperes at 25.2 volts. This means that it has been designed and built to provide the
rated amperage (130A) for 2.5 minutes, i.e. arc welding time, out of every 10 minute period (25% of 10 minutes
is 2.5 minutes). During the other 7.5 minutes of the 10 minute period the Welding Power Source must idle and
be allowed to cool.
A-11732
Figure 3-1: Transarc 130i Duty Cycle
SECTION 3:
SAFETY AND INSTALLATION