Tweco Ultima 150 - Manual (Page 21)

Manual 0-2472 15 SECTION 3: INSTALLATION
B. Connections for Three-Phase
Three-phase operation requires a 3-conductor cable with
ground.
1. Remove the Enclosure Cover from the unit to set
up the correct electrical service.
2. Feed AC input cable through the strain relief on
rear panel of unit and tighten the strain relief
screws.
3. Insert the ground wire into the terminal marked
GND (ground) and tighten the set screw.
4. Connect the other three wires to terminals L1, L2,
and L3 located on the top end of the Main Circuit
Breaker (MCB). L1 is the left terminal, L2 is the
center terminal, and L3 is the right terminal, when
viewing the MCB from the rear of the unit. Tighten
set screws.
Ground
Fuse
Primary
Power Switch
L1
L2
L3
A-00816
Figure 3-4 Three-Phase Input Connections
C. 575 Volt Operation
575V input is handled by an optional step-down Trans-
former Module (Catalog No. 7-3315). When used, input
power is connected directly to the Transformer Module.
Refer to Manual No. 0-2498 for detailed installation in-
structions.
3.05 Voltage Changeover
The ULTIMA-150 Plasma Welding Power Supply is fac-
tory-wired for high voltage operation, greater than 380VAC.
Voltage changeover is required for low voltage operation
(200-230VAC).
NOTE
If the voltage selection plug is improperly set, the 3
amp fuse (1FU) located near the Main Circuit Board
(MCB) will blow to protect the power supply.
1. Locate the High-Low Voltage Selection Receptacle.
2. Move the Voltage Selection Plug into the appropri-
ate receptacle: the bottom receptacle is for 208-
230VAC , the top receptacle is for 380-460 VAC.
High Voltage
Receptacle
Low Voltage
Receptacle
A-00817
Figure 3-5 High-Low Voltage Selection Detail