GENERAL INFORMATION
2
1.2 DUTY CYCLE
The duty cycle of a welding power source is the percentage of a
ten minute period that a welding power source can be operated
at a given output without causing overheating and damaging of
the unit. This unit is rated at 40 percent duty cycle when oper-
ated at 400 amperes.
This means the unit can be operated at 400 amperes for four
consecutive minutes, but it must operate at no load for the
remaining six minutes to allow proper cooling. If the welding
amperes decrease, the duty cycle increases. If the welding
amperes are increased beyond rated output, the duty cycle will
decrease.
EXCEEDING DUTY CYCLE RATINGS
will cause the thermal
overload protection circuit to become energized and shut down
output until the unit cools to normal operating temperature.
CONTINUAL EXCEEDING OF DUTY CYCLE RATINGS
can
cause damage to the welding power source.
• Do not exceed indicated duty cycles.
CAUTION
CAUTION
Summary of Contents for 400 GTSW AC/DC
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