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OM-222 Page 21
3-13. Connecting Input Power
ST-800 103-B / Ref. ST-801 116
3/8 in
3/8 in
Tools Needed:
IMPORTANT
GND/
3
PE
Connect Green Or Green/Yellow
GND/PE Conductor First.
Input Contactor
L1 (U)
L2 (V)
L3 (W)
= GND/PE Earth Ground
1
10
3
When making connections in
the line disconnect device,
connect the Green Or
Green/Yellow conductor first.
Install conductors into
a deenergized line dis-
connect device.
Make connections
to machine first and
supply last.
4
9
6
5
2
3
7
3
8
Y Disconnect and lockout/tagout in-
put power before connecting input
conductors from unit.
Y Have only qualified persons make
this installation.
See rating label on unit and check input
voltage available at site.
1 Line Disconnect Device
2 Input Conductors
3 Grounding Conductor
Select size and length using Section 3-11.
Conductors must comply with national,
state, and local electrical codes. If applica-
ble, use lugs of proper amperage capacity
and correct hole size.
4 Strain Relief
Route conductors through strain relief.
5 Machine Grounding Terminal
6 Line Terminals
Y Make input power connections to
the welding power source before
making connections into a deener-
gized line disconnect device.
Connect green or green/yellow grounding
conductor to machine grounding terminal
first. Then connect input conductors to line
terminals.
Close access door.
7 Disconnect Device (Supply)
Grounding Terminal
8 Disconnect Device Line Terminals
Y In the deenergized line disconnect
device, connect green or green/
yellow grounding conductor to
supply grounding terminal first,
never to a line terminal. Be sure
grounding conductor goes to an
earth ground.
Connect input conductors to line termi-
nals.
9 Overcurrent Protection
Select type and size using Section 3-11
(fused disconnect switch shown).
Close door on line disconnect device.
10 Reed Switch (Ground Current
Sensor) (Optional)
If unit is equipped with optional ground cur-
rent sensor, route grounding conductor
through reed switch two times and con-
nect to ground terminal.
Close access door.