11
SC1900
Setup
and
Installation
Preparing
the
Unit
for
Primary
Power
Only
qualified
personnel
should
perform
this
installation.
♦
Turn
the
input
power
off
at
the
disconnect
switch
or
fuse
box
before
working
on
the
welder.
♦
Do
not
touch
electrically
hot
parts.
Remove
the
top
cover
of
the
SC1900.
All
of
the
connections
that
will
need
to
be
made
are
accessi
‐
ble
with
the
top
cover
removed.
Primary
Power
Cable
♦
Route
the
Primary
Power
Cable
through
the
Power
Inlet
Hole
in
the
top
left
corner
on
the
backside
of
the
welder.
♦
Connect
the
power
leads
(Black,
White,
Red)
to
the
L1,
L2,
and
L3
connectors
as
shown
in
Fig
‐
ure
1.
Firmly
tighten
screws
that
hold
the
power
leads
in
place.
♦
Attach
the
ground
wire
(Green)
to
the
ground
lug
of
as
shown
in
Figure
1.
♦
Once
the
Primary
Power
Cable
is
connected,
tighten
Power
Cable
Clamp
on
the
back
of
the
welder,
holding
the
power
cable
firmly
in
place
(see
Figure
2).
Allow
enough
play
in
cable
so
that
the
cable
is
free
from
any
obstructions
and
does
not
lay
across
jumper
board.
Power
Connections
Ground
Connection
Figure
1
Figure
2
Power
Inlet
(in
back
of
unit)
