Tweco 300 S Arcmaster - Manual (Page 23)

ARCMASTER ® 300 S
March 31, 2006 3-5
3.05 Duty Cycle
The duty cycle of a welding power source is the percentage
of a ten (10) minute period that it can be operated at a given
output without causing overheating and damage to the unit.
If the welding amperes decrease, the duty cycle increases. If
the welding amperes are increased beyond the rated output,
the duty cycle will decrease.
!
WARNING
Exceeding the duty cycle ratings will cause the
thermal overload protection circuit to become
energized and shut down the output until the unit
has cooled to normal operating temperature.
CAUTION
Continually exceeding the duty cycle ratings can
cause damage to the welding power source and
will void the manufactures warranty.
NOTE
Due to variations that can occur in manufactured
products, claimed performance, voltages, ratings,
all capacities, measurements, dimensions and
weights quoted are approximate only. Achievable
capacities and ratings in use and operation will
depend upon correct installation, use, applications,
maintenance and service.