Cables - YASKAWA YWE-EH500-6N0 Instruction Manual

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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
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
Fuse Rated Current
Input Cable
Outside diameter of acceptable
Input Cable
Exclusive-use base metal cable
Grounding Cable
2.3 Power Supply Installed Capacity and Connection Cables
30 kVA
75 A
(rated voltage: 480 V(6N0))
2 2
～ 22mm
14mm
φ27.0 ～ φ30.0mm *1
2
60mm or more (cable length:5m or less)
2
80mm or more (cable length:5m or more) *2
2
14 mm or more
2-2
±
10 %,
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