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6. NECESSARY POWER SOURCE EQUIPMENT
6.1 Welding Power Source Equipment (commercial power supply)
WARNING
⚫
When the welding machine is
used in s
uch a humid environment as construction site, on the
steel plate, or on steel structure, install a leakage breaker.
CAUTION
⚫
Be sure to install a switch with fuses or a circuit breaker (for motor) to the input sides of
each welding machine.
⚫
Capacity of Necessary Power Source Utility
Specification
CPTX-I 400 2W
CPTX-I 500 2W
Supply voltage
Three-phase 400 V
Three-phase 400 V
Tolerance range of fluctuation
of supply voltage
400 V ±10%
400V ±10%
Installed capacity
23 kVA or more
30 kVA or more
Capacity of switch, electric
leakage breaker
40 A
50 A
6.2 Precautions for Use of the Engine Generator or the auxiliary power of an engine welder
CAUTION
⚫
Use the auxiliary power of an engine welder with an improved voltage waveform when it is
used as power source for welding machine. Some engine welders have poor electricity,
which may cause product damage. Contact an engine welder manufacture for improvement
of voltage waveform.
CAUTION
To prevent the engine generator or auxiliary power from being damaged, follow the instructions
below.
⚫
Set the output voltage of the engine generator to voltage range between 415 and 456V at no-
load welding operation. Setting to an extremely high output voltage may result in product
damage.
⚫
Use the engine generator with a damper winding that has a capacity of more than twice that
of the rated input of the welding machine. 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 result in an abnormal decrease in output current or arc
loss. Ask an engine generator manufacturer for a damper winding.
⚫
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.
⚫
This equipment does not comply with IEC 61000-3-12. If it is connected to a public low
voltage system, it is the responsibility of the installer or user of the equipment to ensure, by
consultation with the distribution network oper, that the equipment may be connected.