Electrical Input Requirements - Thermal Arc Fabricator 250C III Operation Manual

3.04 Electrical Input Requirements

Operate the welding power source only from a three-phase 50/60 Hz, AC power
supply. The input voltage must match the electrical input voltage shown on the
input data label on the unit nameplate. Contact the local electric utility for information
about the type of electrical service available, how proper connections should be made,
and inspection required.
The line disconnect switch provides a safe and convenient means to completely
remove all electrical power from the welding power supply whenever necessary to
inspect or service the unit.
This unit is equipped with a three-conductor with earth power cable that is connected
at the welding power source end for three-phase electrical input power.
Do not connect an input (BROWN, BLUE or RED) conductor to the ground terminal.
Do not connect the ground (YELLOW/GREEN) conductor to an input line terminal.
Refer to Figure 3:
1 Connect end of ground (YELLOW/GREEN) conductor to a suitable ground.
Use a grounding method that complies with all applicable electrical codes.
2 Connect primery power cable ends; line 1, line 2 and line 3 input conductors
to the de-energized line disconnect switch.
3 Use the below table as a guide to select line fuses for the disconnect
switch.
Input Voltage
3Phase 400 VAC
Fuse size are based on not more than 200 percent of the rated input amperage of the
welding power source (please refer beck to the local Electrical Codes).
Note
Electrical Input Connections
Note
Electrical Input Connections
12
Fuse Size
32 Amps
Figure 3.