OTC DP-400 - General Notice of Operation; Rated Duty Cycle Explanation; Use Limitations

No. P10355
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3. GENERAL NOTICE OF OPERATION
3.1 Rated Duty Cycle
CAUTION
 
Use this welding power source at or under the rated duty cycle. Exceeding the rated duty
cycle limitation may result in damage to the welding machine.
xThe rated duty cycle of the welding power source is the following:
400A 50% (for pulse mode)
400A 60% (for DC mode)
xThe duty cycle of 60% means the way the machine is rested for 4 minutes after 6
minutes of continuous welding at the rated current.
Operation cycle of 60% duty cycle
xFailure to observe duty cycle limitations may cause an excess of the tolerance of the
temperature inside the welding machine. This may contribute to premature welding
machine failure or product damage.
xThe figure shown right indicates the relation
between welding current and duty cycle. Use
the welding machine within its usable range,
following the duty cycle for the welding current.
xThe duty cycle of the welding power source is
also limited by the duty cycles of accessories
combined with such as welding torches. Use
the welding machine within the lowest rated
duty cycle of the accessories.
3.2 Applicable Welding Process and Wire Diameter
Refer to Section 10.1.1, “Setting of Welding Mode” for details of applicable welding method and
wire diameter.
3.3 Limitation of use
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Do not use this welding power source for pipe thawing.
6 min.
4 min.
10 min.
ON
OFF
100
50
0
100
%
(270A or less)
DUTY CYCLE
WELDING CURRENT (A)
(%)
100 200 300
60
%
82
%
DP-400
Usable range
350
(Rated)
50
%
400
(PULSE MODE)
100
50
0
100
%
(310A or less)
DUTY CYCLE
WELDING CURRENT (A)
(%)
100 200 300
60
%
DP-400
Usable range
(Rated)
400
(DC MODE)