22
Operators Manual
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Duty Cycle
The term duty cycle indicates the percentage
welding time available at the rated output
current, for each 10 min period over 4 hours.
The Weldmatic 200i is rated 200 Amps,
15% duty cycle. The Weldmatic 250i is rated
250 Amps, 20% duty cycle. If the machine
is operated at a reduced welding current, a
higher duty cycle is available. The diagram
below illustrates the appropriate duty cycle
rating for the range of welding currents
available from the 200i and 250i, and so
allows the maximum welding time per 10
minute period to be determined.
The power source is protected by in built
over temperature protection devices. These
will operate if the machine is operated in
excess of its current and duty cycle rating. If
this occurs, the fan will continue to run, but
the machine will not deliver welding current
until the unit has cooled sufficiently.
Fig 11
Duty Cycle Rating
200 220 240 260
Maximum welding time
per 10 min
