Connecting 3-Phase Input Power - Miller Axcess 300 Owner's Manual

3-12. Connecting 3-Phase Input Power

5
4
7
Tools Needed:
Y Turn Off welding power source, and
check voltage on input capacitors
according to Section 8-1 before
proceeding.
Y Installation must meet all National and
Local Codes - have only qualified
persons make this installation.
Y Disconnect and lockout/tagout input
power before connecting
conductors form unit.
Y Make input power connections to the
welding power source first.
Y Always connect green or green/yellow
conductor to supply grounding terminal
first, and never to a line terminal.
.
The Auto-Line circuitry in this unit
automatically links the power source to the
primary voltage being applied. Check input
voltage available at site. This unit can be
connected to any input power between 208
and 575 VAC without relinking the power
source.
1 Input Power Conductors (Customer
Supplied Cord)
OM-216 967 Page 16
3
= GND/PE Earth Ground
8
3
L1
6
L2
L3
1
5/16 in
Select size and length of conductors using
Section 3-11. Conductors must comply with
national, state, and local electrical codes. If
applicable, use lugs of proper amperage
capacity and correct hole size.
Welding Power Source Input Power
Connections
2 Strain Relief
input
Install strain relief of proper size for unit and
input conductors. Route conductors (cord)
through strain relief and tighten screws.
S Use large strain relief for input conductor
size 8 and larger.
S Use small strain relief with reducing
washers for input conductor size 10.
Connect input conductors as shown in
illustration.
Route green or green/yellow grounding
conductor through current transducer and
connect to welding power source grounding
terminal first. Then connect input conductors L1,
L2, and L3 to welding power source line
terminals.
Route input power cable
through tubing inside unit.
Route ground conductor
through current transducer to
ground terminal.
WARNING
ELECTRIC SHOCK can kill;
SIGNIFICANT DC VOLTAGE
exists after removal of
input power.
S Always wait 5 minutes after power
Is turned off before working on unit.
S Check input capacitor voltage, and
be sure it is near 0 before touching
any parts.
Read Owner's Manual.
Three-Phase Input Connection
Ref. 144 221 / Ref. 070 399-F / 804 657-A / 218 005-A
Reinstall side panel onto welding power source.
Disconnect Device Input
Connections
3 Disconnect Device (switch shown in
the OFF position)
4 Green Or Green/Yellow Grounding
Conductor
5 Disconnect Device Grounding Terminal
6 Input Conductors (L1, L2 And L3)
7 Disconnect Device Line Terminals
Connect green or green/yellow grounding
conductor to disconnect device grounding
terminal first.
Connect input conductors L1, L2, and L3 to
disconnect device line terminals.
8 Over-Current Protection
Select type and size of over-current protec-
tion using Section 3-11 (fused disconnect
switch shown).
Close and secure door on disconnect device.
Remove lockout/tagout device, and place
switch in the On position.
2
Power