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Thu
dirty cycle
of
a
welding
power
sOtrice
is the
percentage
I
a
ten
minute
period
that
a
welding
power
tout ce
con
safely
be
operated
ni
a
given
output
ciii
ciii
-rIlirIq. This
welding
ir~.jrr
snur cr-i
in,
nun
Rt
7~ir
nhltpernv,
iflO
nirceit
duty
cyci~.
Tins
merits
the
wriidilirl
power
suurr:rn-:vIi
be
safrnly
operated
at
750
anlprrres welrlirer
c.rrrvor
coicticununciy.
If the
welding
current
is
increased
SilO
duty cynic
viii
decrease
Figure
1-2
untihies the
oporatol
to
Irnici
nrc
the
sole
ouSuirt
hi
,~rrldi
ng
powet
source ar
var
ir
15
ui
y
noises
~Pr~RTA~T
L
~
-~
Exceeding
the
ndieriterl
duly
C/lie
will
cause
the
t~iriirq
pointer
sourss
Na
ov-rheaS
and
thereby
cause
damage
to
the
welding
power
source
components.
Tie
volt-ampere
curve
shows the
output
voltage
available
at
an-c
given
output
current
within the limits of the minimum
and maximum values of the VOLTAGE
CONTROL
setting.
Load
voltage
is
predetermined
to
a
large degree by
arc
char
acteristics. With
the
use
of the
volt-ampere
curve, it
is pos
sible
to
determine the amperage
required
for
a
specific
load
voltage.
With reference
to
the
volt-ampere
curve
(Figure
4-3),
the
curve
shows
only
the maximum and minimum
settings
of
the
VOLTAGE CONTROL
for each of the five
slope
reactor
tap
connection
ranges.
Curves of other
VOLTAGE CON
TROL
settings
will fall between the maximum and minimum
curves
shown.
SECTION 5
-
SEQUENCE
OF OPERATION
I-
.
.1
Never,
under any Circumstances, operate the
welding
power
source
with
the
outer
enclosure removed. In
addition
to
a
safety hazard, improper cooling
may
re
sult
in
damage
to
the
welding
transformer and
the
welding
power
source
components.
Warranty
is void if
the
welding
power
source
is
operated
with the
Outer
enclosure open
or
removed.
I
~Lu1l.]~IJ
Prior
to
welding,
it is
imperative
that proper
protective
clothing (welding
coat
and
gloves)
and eye
protection
(glasses
and/or
welding helmet)
be
put
on.
Failure
to
comply
may
result in serious
and/or permanent
bodily
damage.
8.
Turn
on
the
shielding
gas
supply.
5-1.
GAS METAL-ARC
(GMAW)
WELDING
1
.
Make Electrical
input
connections
as
outlined in item
3-2
-
2
Make
Secondary
connections
as
outlined in item
3-3.
3.
If
a
Remote Contactor Control device is
used,
make
Contactor
Control connections
as
instructed in
item
3-5 and
place
the
CONTACTOR CONTROL Switch
in
the
REMOTE
position.
4.
II
a
Remote
Voltage
Control
is
to
be
used,
make
con
nections
to
the VOLTAGE CONTROL
Receptacle
as
instruction in item 3-6 and
place
tIle VOLTAGE
CON
TROL Switch
in
the REMOTE
position.
5.
If
115
volts
ac
is
required
to
operate
a
control/feeder,
make connections
to
the
three-prong,
twistlock,
115
VOLTS AC
Receptacle
as
instructed in item 3-4.
6.
Rotate
the
VOLTAGE CONTROL
to
the
approximate
desired
setting.
7
Ensure that the Circuit Breaker and external Line Dis
connect
Device
are
in the
ON
position.
9.
Place
the
POWER
Switch
to
the
ON
position
and
commence
welding.
10.
The
VOLTAGE
CONTROL
may
be
rotated
while
welding.
5-2.
SHUTTING
DOWN
1.
Breakthearc.
2.
Allow the
welding
power
source
to
idle for 3 minutes
with
no
load
applied.
3.
Place
the
POWER Switch in the
OFF
position.
4.
Turn off the
shielding
gas
at
the
shielding
gas
source.
CAUTION
I
.
-I
If
welding
is
performed
in
a
confined
area,
failure
to
turn
off the
shielding
gas
supply
could result in
a
build
up
of gas
fumes, thereby endangering personnel
re
entering
the
welding
area.
SECTION
6-
MAINTENANCE
Be
sure
the branch circuit
or
main
disconnect switch is
open
or
electrical
input
circuit
fuses
are
removed
before
attempting
any
inspection
or
work
on
the in
side of the
welding
power
source.
Placing
the
POWER
Switch
on
the
welding
power
source
in the OFF
posi
tion
does
not
remove
voltage
from the power
ter
minals inside of the
welding
power
source.
U
6-1.
FAN MOTOR
All
models
are
equipped
with
an
exhaust fan
and
rely
on
forced draft for
adequate
cooling.
The fan
motor
is
manufac
tured with
lifetime
lubricated
sealed ball
bearings
and
no
attention should be
required.
6-2.
TRANSFORMER
Occasional
blowing
out
of the dust and dirt from around the
transformer
is
recommended. This should be done
periodi
cally
depending
upon
the
location
of
the
unit
and
the
I
4-8.
VOLT-AMPERE CURVE
(Figure
4-3)
I
200
300
400
500
600
700
800
900
EB-901
181-1
Figure
4-3.
Volt-Ampere
Curve
I
I
I
I
I
CAUTI9N__~
I
Page
12
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