Tweco 300 MST Arcmaster - Manual (Page 19)

13
2.05 Electrical Input Connections
WARNING 4
ELECTRIC SHOCK can kill; SIGNIFICANT DC VOLTAGE is present after removal of input power.
DO NOT TOUCH live electrical parts.
SHUT DOWN welding power source, disconnect input power employing lockout/tagging procedures.
Lockout/tagging procedures consist of padlocking line disconnect switch in open position, removing fuses
from fuse box, or shutting off and red-tagging circuit breaker or other disconnecting device.
2.05.01 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 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 2
This unit is equipped with a three-conductor with earth power cable that is connected at the welding
power source end for single or three-phase electrical input power.
Do not connect an input (WHITE, BLACK or RED) conductor to the ground terminal.
Do not connect the ground (GREEN) conductor to an input line terminal.
Refer to Figure 3 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 1 and Table 2 as a guide to select line fuses for the disconnect switch.
Note 3
For Single-Phase operation connect the GREEN, BLACK and WHITE input conductors. Insolate
the RED Conductor, it is not used for Single-phase operation.