OPERATOR CONTROLS
20
MANUAL 430429-490
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:
(
) (
)
(
)
cycle
duty
desired
cycle
duty
rated
current
rated
current
2
×
=
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:
(
) ( )
( )
.50
.25
400A
current
2
×
=
( )
0.5
160,000
current
×
=
80,000
current
=
A
8
.
282
current
=
Содержание 400MSTW CC
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