Miller 900019 Installations- und Betriebshandbuch - Seite 9
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and
of
adequate
size.
Electrode holder and
ground
clamp
should be at least 200 ampere
capacity
and
securely
connected
to the
welding
cables.
An
in
sulated
electrode holder
must be
used
to
ensure
operators
safety.
Select
the proper size
welding
cable from Table
3-2.
A.
Jack
Plug
Installation
(Figure
3-4)
Two
jack
plugs,
enclosed
in
a
cloth
bag,
are
fur
nished with the
welding
machine.
Follow instruc
tions
carefully
for proper installation of
the
jack
plugs
to
the
welding
cables.
See Table 32
for
proper
welding
cable
sizeS
Standard
jack
plugs
furnished
with
unit will accommodate cable sizes
ranging
from 6
to
1.
1.
Remove
3/4
inch of
insulation from
one
end of
each
welding
cable.
2.
Clamp
the
welding
cable in
a
vise with
the
un
insulated end
protruding
upward
out of the vise
approximately 1-3/4
inches.
3.
Place
the
steel
tie
wire
(A)
approximately
1/4
inch
from the end of
the
insulation.
4.
Make
a
half
turn around
the cable
bringing
the
looped
ends of the tie wire
together.
5.
Insert
a
rod of
approximately 3/8
inch diameter
through
the
two
looped
ends of the tie
wireS
6.
Twist the tie wire
(B)
until the entire tie wire is
twisted and is
tight
around the insulation
of the
welding
cable.
7.
Clip
off
the
looped
ends
of
the
tie
wireS
8.
Bend the twisted tie wire
over
alongthe
side
(C)
of the uninsulated
portion
of the
welding
cable.
9.
Wrap
the
strip
of copper foil
tightly
around the
uninsulated end of the
welding
cable and the twist
ed tie wire
(D).
10.
Place the
jack plug
on
the end of the
welding
cable
and
push
it onto the
welding
cable
over
the copper
foil
(E).
11.
Insert the
1/4-20
allen
set
screws
into the center
CAUTION
cfl~
Figure
3-4.
Jack
Plug
Installation
and
upper
holes in the
jack
plug
and
tighten.
12.
Remove
the
welding
cable from the vise and in
sert the
jack plug
into the fiber
sleeve. Slide
the
fiber sleeve
over
the
jack
plugandweldingcahle
until the hole in the fiber sleeve lines up with the
8/32
hole in the
jack
plug
(F).
13.
Insert the
8/32
self
tapping
screw
through
the
hole
in
the
fiber
sleeve
into
the
jack plug.
Tighten
the
screw
with
a
screw
driver.
Connect
a
Work
Clamp
to
one
of
the
unused ends
of
one
of the
cables.
Connect
an
Electrode Holder
to
the unused
end
of the other
welding
cable.
The
method of
connecting
the cables to the work
clamp
and
electrode
holder
will
depend
on
the
manu
facturers
design.
SECTION
4
-
OPERATION
I
Never,
under any
circumstances, operate
the
weld
ing
machine with the
cover
removed.
In addition to
a
safety
hazard, improper
cooling
may
result
in
damage
to the
welding
transformer and the
welding
machine
components.
Be
sure
to read the
complete
safety
section at the
front of
the manual before oper
ating
the
welding
machine.
20
30
40
50
60
7080
100
%
DUTY CYCLE
A-101 391A
Figure
4-1.
Duty Cycle
Chart
4-1. DUTY CYCLE
(Figure
4-1)
The
duty cycle
of
a
welding
machine
is
the
percentage
of
a
ten minute
period
that the
welding
machine
can
operate
safely
at
a
given
output.
This
welding
machine is
rated
at
a
20
percent
duty cycle.
This
means
that
the
welding
ma
chine
can
operate
safely
at rated load if the
ma
chine
is
on
for
no
more
than
two
minutes and
off for
eight
minutes.
If the
output
is increased above rated
load,
the
duty cycle
must be
reduced.
Figure
4-1 shows the
percent
duty
cycle compared
to
output.
This chart
should be used for reference
by
the
operator
to de
termine
the
operating
limits
or
ON time of the weld
ing
machine
if
it is
operated
above rated
output.
4-2.
OPEN CIRCUIT VOLTAGE
This
welding
machine
provides
80
volts open
circuit
on
the
ac
LOW range and 55 volts open cir
cuit
on
the
ac
HIGH current range.
Open
circuit
voltage
is
the
voltage
present
between the electrode
and work
before
an
arc
has been
struck.
4-3.
ARC VOLTAGE
Arc
voltage
is the
voltage
between the electrode
and work while
a
welding
arc
is
being
maintained.
Two open circuit
voltages
permit
the
use
of
larger
electrodes
demanding
high welding
amperages
with
minimum power
requirements.
The
higher
open cir
cuit
voltage
enables the welder to
use
small dia
meter
electrodes,
stainless
steel,
low
hydrogen
and
other hard to
run
electrodes with
complete
satis
faction.
I
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FPL
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024-4
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200
175
150
125
100
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80
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IOM-114A-
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7