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MANUAL 0-2510
2.06 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.
Continually exceeding the duty cycle ratings can cause damage to the
welding power source.
To calculate duty cycle:
(rated current)
2
x (rated duty cycle)
(desired duty cycle)
current =
i.e. At the 400A rated output current, and 25% rated duty cycle, the
operator wants to work on a 50% duty cycle. The maximum allowable
current draw is:
(400A)
2
x (.25)
(.50)
current =
160,000 x (0.5)
current =
80,000
current =
282.8A
current =
INTRODUCTION
Summary of Contents for Thermal Arc 400GMS CC
Page 16: ...14 MANUAL 0 2510...
