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transit
must
be filed
by
the
purchaser
with the carrier.
A
copy
of the bill of
lading
will be furnished
by
the
manu
facturer
on
request
if occasion
to
file claim arises.
When
requesting
information
concerning
this
equip
ment,
itis essentialthat Model
Description
and Serial
(or
Style)
Numbers of the
equipment
be
supplied.
2-3.
DESCRIPTION
This unit
converts
the
output
of
an ac
welding
power
source
to
provide
dc
output
for
Shielded
Metal Arc Weld
ing
and scratch start
Gas
Tungsten
Arc
Welding.
The
unit is
equipped
with 2 four-foot
interconnecting
cables
and
jack plugs.
The
cooling
fan
operates
on
the
welding
power
source
secondary voltage.
2-4.
DUTY CYCLE
(Figure
2-2)
The
duty cycle
is the
percentage
of the
ten
minute
period
that this unit
can
be
operated
at
a
given
output
without
causing damage
and
overheating.
This unit is rated
at
20
percent
duty cycle.
This
means
the unit
can
be oper
ated
at
rated load for two minutes
out
of every ten. Dur
ing
the
remaining eight
minutes,
the unit should idle
to
permit
proper
cooling.
If
the
welding
amperes
are
de
creased,
the
duty cycle
will increase.
Figure
2-2
enables
the
operator
to
determine the
output
of the unit
at
vari
ous
duty cycles.
a
CAUTION: EXCEEDING DUTY CYCLE
RAT
INGS will
damage
the unit.
I
Do
not
exceed indicated
duty cycles.
SECTION 3-INSTALLATION
3-1.
LOCATION
The service life and
efficiency
of the unit
are
reduced
when it is
subjected
to
high
levels of
dust, dirt, moisture,
corrosive vapors, and
extreme
heat.
4A
CAUTION: RESTRICTED AIR FLOW
causes
overheating
and
possible damage
to
inter
nal
parts.
Do
not
restrict air flow
to
any
part
of the
con-
trol.
3-2.
FIELD INSTALLATION ONTO
SW2225
(If
appli
cable)
(Figure
3-1)
WARNING: ELECTRIC SHOCK
can
kill.
Do
not
touch live electrical
parts.
Shut down
welding
power
source, and dis
connect
input
power
employing lockout/tagging
procedures
before
beginning
this installation.
Lockout/tagging procedures
consist of
pad
locking
line disconnect switch in open
position,
removing
fuses from fuse
box,
or
shutting
off
and
red-tagging
circuit breaker
or
other discon
necting
device.
To install unit onto
SW2225,
proceed
as
follows:
1.
install brackets to unit
using
sheet metal
screws
in
wrapper.
2.
Drill
two
5/32 in.
(4 mm)
diameter holes in SW2225
wrapper
on
each
side
at
locations
shown
in
Figure
3-1.
3.
install unit onto
SW2225 wrapper
using supplied
screws.
3-3.
CONNECTION
TO
WELDING
POWER
SOURCE
(Figure 3-2)
4A
WARNING: ELECTRIC SHOCK
can
kill.
Shut down the
welding
power
source
and be
sure
it
cannot
be
accidentally energized
before
connecting
the converter.
IMPORTANT:
If the
welding
power
source
has weld
output
terminals,
install
lugs
of
adequate
amperage
ca
pacity
to
the
cables from
the converter.
300
250
RATED OUTPUT
~-
U,
iu
150
~
w
0.
~
4
~100
uJ
~
75
50~
-.
~h
-
-
~
10
15
20
25
30
40
50
00
70
00
90
100
% DUTY
CYCLE
8-088 987
Figure
2-2.
Duty
Cycle
Chart
a
121988
Page
7
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