P
RODUCT
C
ONFIGURATION
P
RODUCT
S
PECIFICATION
AND
C
ONFIGURATION
C
HAPTER
2
2-4
2.1.4
Rated duty cycle
This section explains the rated duty cycle of the welding power source.
2.2 Product Configuration
This section explains the standard or optional composition of the welding power source and parts to be
prepared by customers.
• Use this welding power source at or under the rated duty cycle.
Exceeding the rated duty cycle may result in deterioration and damage to the welding
power source.
• Periodically blow moisture-free compressed air to clean dust and dirt accumulated on
the transistor and radiation fin of the diode.
If dust and dirt accumulate on the radiation fin, it may not only reduce the duty cycle
but also result in degradation or burnout of the welding power source.
• The rated duty cycle of the welding power source is the
following
：
<Operation cycle at duty cycle of 60 %>
350 A 60 % (for three phase)
250 A 60 % (for single phase)
(Rated duty cycle of 60% means the power source must be
rested for 4 minutes after 6 minutes of continuous welding
at the rated current.)
• Use the welding power source within its usable range by
observing the duty cycle for the welding current.
• Use the welding power source within the lowest rated duty
cycle of combined accessories such as welding torches.
<Relationship between welding current and duty cycle>
Energized
Stop
6 minutes
4 minutes
10 minutes
=
Three phase
?
=
Single phase
?
Welding current (A)
Duty cycle (%)
Welding current (A)
Duty cycle (%)
100
60
50
0
100
200
350
271
Usable range
100
60
50
0
100
250
194
Usable range
