Tweco 300 TS Arcmaster(Feb2006) - Manual (Page 24)

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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 5
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
temperatur
CAUTION 1
Continually exceeding the duty cycle ratings can cause damage to the welding power
source and will void the manufactures warranty.
NOTE 5
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.