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6. NECESSARY POWER SOURCE EQUIPMENT
6.1 Welding Power Source Equipment (for commercial use)
WARNING
٨
When the welding machine is used in a humid environment such as a construction site, on a
steel plate, or on a steel structure, install a leakage breaker.
CAUTION
٨
Be sure to install a switch with fuse or a circuit breaker (for motor) to the input sides of each
welding machine.
Capacity of Necessary Power Source Utility
AC-TIG
DC-TIG
STICK
Power supply voltage
400 V, three phase
Tolerance range of fluctuation of power
supply voltage
400V±15%
Installed capacity
12.5kVA or more
11.9kVA or more
13.2kVA or more
Capacity of switch/circuit breaker
50 A
50 A
50 A
6.2 Precautions for Use of the Engine Generator
CAUTION
٨
Use the auxiliary power of engine welder with an improved voltage waveform. Some engine
welders have poor electricity, which may cause product damage. Contact an engine welder
manufacturer for improvement of voltage waveform.
To prevent the welding power source from being damaged because of engine generator, follow the
instructions below.
٨
Set the output voltage of the engine generator to the voltage range between 400 and 420V at
no-load welding operation. Setting to extremely high output voltage may result in product damage.
٨
Use an engine generator with a damper winding that has a capacity of more than twice that of the
rated input of the welding power source. Generally, the recovery time of the engine generator’s
voltage for load change is slower than that of the commercial input power source, and if the engine
generator does not have sufficient capacity, sudden current change such as arc start will occur.
This may cause abnormal decrease in output current or arc loss. Ask an engine generator
manufacturer for a damper winding.
٨
Do not combine more than two welding machines with a single engine generator. The effect of
each welding machine may cause easy loss of arc.