2.4 Duty cycle and Over-heat
The letter “X” stands for Duty
Cycle,=which is defined as the portion of
the time a welding machine can weld
continuously with its rated output current
within a certain time cycle (10 minutes).
The relation between the duty cycle
“X” and the output welding current “I” is
shown as the right figure.
If the welding machine is overheating,
the IGBT over-heat protection sensing will
send a signal to the welding machine
control unit to cut the output welding
current OFF and light the over-heat pilot
lamp on the front panel. In that case,
the machine should not be welding for
10-15
minutes
to
cool
down
with the fan running. When operating
the machine again, the welding output
current or the duty cycle should be
reduced.
ADVANCEMULTI205P
100%
60%
19
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