Tweco 300 DC Arcmaster - Manual (Page 22)

ARCMASTER 300 ACDC
3-2 February 22, 2006
3.04 Electrical Input Requirements
Operate the welding power source from a single or three-
phase 50/60 Hz, AC power supply. The input voltage must
match one of the electrical input voltages 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 any 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.
NOTE
These units are equipped with a three-
conductor with earth power cable that is
connected at the welding power source end
for single and three phase electrical input
power.
Do not connect an input (WHITE or BLACK or RED)
conductor to the ground terminal.
Do not connect the ground (GREEN) conductor to an input
line terminal.
Refer to Figure 3-1 and:
1. Connect end of ground (GREEN) conductor to a
suitable ground. Use a grounding method that complies
with all applicable electrical codes.
2. Connect ends of line 1 (BLACK) and line 2 (WHITE)
and line 3 (RED) input conductors to a de-energized line
disconnect switch.
3. Use Table 3-1 and Table 3-2 as a guide to select line
fuses for the disconnect switch.
Input Voltage Fuse Size
208V 100 Amps
230V 100 Amps
480V 50 Amps
Table 3-1: Electrical Input Connections
NOTE
Fuse size is based on not more than 200 percent of the rated input amperage of the welding power source
(Based on Article 630, National Electrical Code).
Welding Power Supply
Ground Terminal
Ground Conductor
Line Disconnect Switch
Line Fuse
Primary Power Cable
Art # A-04982
Figure 3-1: Electrical Input Connections