2.3 Power Supply Installed Capacity and Connection Cables
2-2
HW0480311
HW0480311
4.
If there is a pool or pond between the grounding of the power supply switchboard and
the welding source, the leak current is concentrated in the pool or pond. In such a
case, connect the grounding with a cable to escape the leak current through the cable.
2.3
Power Supply Installed Capacity and Connection
Cables
The following table " Table. 1 Power Supply Installed Capacity and Cables " shows the power
supply installed capacity and connection cables which are required for using the welding
source.
The rated input voltage for the welding source is three-phase, 480V(6N0). The welding
source supports a voltage compensation circuit so that the equipment can operate at a power
voltage within
±
10 % fluctuations of the rated value. All the same, it is recommended to use a
power supply as stable as possible. If fluctuations in power supply voltage exceed
±
10 %,
welding source conditions cannot be guaranteed and problems may occur.
Diameter of the input cable and the fuse capacity must be in compliance with the table " Table.
1 Power Supply Installed Capacity and Cables ". Install a non-fuse breaker (NFB) or a switch
with fuse for each welding source.
The non fuse breaker used should be the same capacity of the fuse indicated in " Table. 1
Power Supply Installed Capacity and Cables ", and the tripping time at 600 % of the rated cur-
rent should be one second or longer (General motor breakers satisfy these requirements). If
breaker capacity is insufficient or primary voltage is too high, the breaker will be tripped when
the welding source is turned ON.
Table. 1 Power Supply Installed Capacity and Cables
Installed Capacity
30 kVA
Fuse Rated Current
75 A
(rated voltage: 480 V(6N0))
Input Cable
14mm
2
～
22mm
2
Outside diameter of acceptable
Input Cable
φ
27.0
～ φ
30.0mm *1
Exclusive-use base metal cable
60mm
2
or more (cable length:5m or less)
80mm
2
or more (cable length:5m or more) *2
Grounding Cable
14 mm
2
or more
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