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Chapter 3 Transportation and
Installation
This chapter explains the necessary equipment, installation environment and transportation method for installing the
welding power source.
3.1 Required Equipment
This section explains the necessary power supply equipment for installing the welding power source and equipment for
preventing lack of oxygen and dust hazard during welding.
3.1.1
Welding power source equipment
For installing the welding power source, power source equipment and protective device that meet the following ratings
are required.
3.1.1.1
Use of the engine generator and auxiliary power
When using an engine generator for the welding power source, pay attention to the following.
• Set the output voltage of the engine generator to the voltage range between 400 and 420 V at no-load
welding operation.
Setting to an extremely high output voltage may result in damage to the welding power source.
• Use an engine generator with a damper winding that has a capacity of more than twice the rated input
(kVA) 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
power source. If the engine generator does not have sufficient capacity, sudden current change such as arc start will
occur and this may result in an abnormal decrease in output current or arc loss.
• When the welding power source is used in a humid environment such as construction
site, or location with highly conducting material such as steel plate or on steel structure,
install a leakage breaker.
Otherwise, electric shock due to leakage of electricity may occur.
• Be sure to install a switch with fuse or a circuit breaker to the input side of each welding
power source.
Otherwise, electric shock and fire due to overcurrent or damage to the welding power
source may occur.
Equipment
Rating
Three phase
Single phase
Welding power source
equipment
Supply voltage
208/230/460 V ± 10%
Installed capacity
21 kVA or more
14 kVA or more
Protective device
Switch with fuse
Switch capacity
70 A or more for 208/230 V,
50 A or more for 460 V
70 A or more for 208/230 V,
30 A or more for 460 V
Fuse
70 A for 208/230 V,
50 A for 460 V
70 A for 208/230 V,
30 A for 460 V
No-fuse breaker
(or leakage breaker) (*1)
75 A
*1:
High sensitivity type leakage breaker is recommended for installing a leakage breaker.
(Consult the breaker manufacturer for details)
CAUTION
• To prevent the welding power source from being damaged or arc loss, follow the
instructions below.
