Tweco Merlin 6000 Master PS - Manual (Page 21)

Manual 0-2568 3-3 INSTALLATION PROCEDURES
B. Input Voltage Selection
Every Power Supply is factory-wired for 460V three-phase
input. For any other input voltage, the Power Supply
must be changed using the procedures in Section 3.07.
C. Opening Power Supply Enclosure
The left side panel (viewed from the front) of the Power
Supply must be removed to make electrical connections
and to select the proper input voltage.
WARNING
Disconnect primary power at the source before as-
sembling or disassembling power supply, torch
parts, or torch and leads assemblies.
1. Remove the ten screws which secure the left side panel
(viewed from the front) to the Power Supply .
Left Side Panel
Screws
(10 Places)
A-01535
Figure 3-3 Opening Power Supply
2. Remove the left side panel from the Power Supply.
3.07 Voltage Selection
The Power Supply can be wired to use input voltages
from 200 - 575 VAC. Power Supply is factory-wired for
460 VAC, three-phase input. Voltage selection is accom-
plished by switching busbar connections on the input
voltage terminal board inside the Power Supply.
1. Locate the input voltage terminal board on the
left side of the power supply.
Input Voltage
Terminal Board
L1
L2
L3
Busbars
A-00985
Extra Busbar
Storage Location
Figure 3-4 Input Voltage Terminal Board Location
NOTE
Extra busbars are attached (stored) to the top side
of the power transformer assembly.
2. Check the busbar configuration on the input volt-
age terminal board . The busbar configuration
must correspond with the available line voltage
per the following figure and the label inside the
unit: