S
PECIFICATION
P
RODUCT
S
PECIFICATION
AND
C
ONFIGURATION
C
HAPTER
2
16
2.1.4
Rated duty cycle
This section explains the rated duty cycle of the welding power source.
CAUTION
• 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
：
(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.)
Welding power
source
Welding
process
Rated output Rated duty cycle
WB-P402L
DC
400 A
60%
<Operation cycle at duty cycle of 60 %>
DC PULSE
400 A
50%
DC TIG
400 A
60%
MMA
300 A
80%
WB-P502L
DC
500 A
60%
DC PULSE
400 A
80%
DC TIG
400 A
100%
MMA
490 A
60%
•
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.
Energized
Stop
6 minutes
4 minutes
10 minutes
