Miller ARC PAK 350 Manuale d'uso - Pagina 12

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Miller ARC PAK 350 Manuale d'uso
3-1.
VOLT-AMPERE CURVES
(Chart 3-1)
RATED
OUTPUT
The
volt-ampere
curves
show the
voltage
and amper
age
output
capabilities
of the
welding
power
source.
Curves of other
settings
fall between the
curves
shown.
With the
use
of the
volt-ampere
curves,
it is
possible
to
determine
the weld
amperage
at
any
particular
load volt
age.
3-2.
DUTY CYCLE
(Chart 3-2)
Chart
3-2.
Duty Cycle
:ury
CyCLE
C
The
duty cycle
is the
percentage
of
a
ten
minute
period
that
a
welding
power
source can
be
operated
at
a
given
output
without
overheating
and
damaging
the unit. This
welding
power
source
is rated
at
100%
duty cycle.
The
unit
can
be
operated
at
rated load
continuously,
If the
welding
amperes
increase
beyond
rated
output,
the
duty
cycle
decreases.
Refer
to the
Duty
Cycle
chart
(Chart 3-2)
to
determine
the
Output
of the
welding
power
source
at
various
duty
cycles.
a
CAUTION:
EXCEEDING
DUTY
CYCLE
RATiNGS
will
damage
the
welding
power
source.
Do not exceed indicated
duty cycles.
3-3.
DESCRIPTION
This unit is
a
three-phase,
or
single-phase
if
derated, dc,
arc
welding
power
source
having
constant
voltage (CV)
and
constant current
(CC)
output
characteristics for
multi-process capability.
The unit
produces
dc weld
out
put
and
is
designed
for-use with Shielded Metal Arc
(SMAW),
Gas Metal Arc
(GMAW),
Gas
Tungsten
Arc
(GTAW),
Flux Cored Arc
(FCAW), Submerged
Arc
(SAW),
and
Air
Carbon
Arc
(ACA) cutting
and
gouging
welding
processes.
The
solid-state,
electronic
components
of this unit
are
lo
cated
in
sealed
areas
unexposed
to
airflow and
asso
ciated contaminants. The fan
motors
cool
only
the heat
sinks and main transformer.
SECTION
4-
INSTALLATION OR RELOCATION
4.1.
SITE SELECTION
Select
an
installation site which
provides
the
following:
1.
Correct
input
power
supply
(see
unit
nameplate)
2.
Shielding
gas
supply (if applicable)
3.
Water
supply (if applicable)
4.
Adequate
ventilation and fresh air
supply
5.
No flammables
6.
A clean and
dry
area
7.
Proper
temperature
that avoids extremes of heat
or
cold
8.
Proper
airflow around unit
9.
Adequate
space for
removing
top
cover
and
outer
panels
for
installation, maintenance,
and
repair
functions.
Base
mounting
holes
provide
the
capability
to
install and
secure
the unit
on a
running
gearor
in
a
permanent
loca
tion.
Figure
3-1
gives
overall dimensions and base
mounting
hole
layout.
4A
WARNING:
FIRE
OR EXPLOSION
can
result
from
placing
unit
on or over
combustible
surfaces;
RESTRICTED AIRFLOW
can cause
overheating
and
possible damage
to Internal
parts.
Do
not
locate unit
over
combustible surfaces.
Maintain
at
least 6 inches
(152 mm)
of
unrest
ricted space
on
tight
side of
unit,
and
keep
underside free of obstructions,
Do
not
place
any
filtering
device
over
the
in
take air
passages
that
pro
vide airflow
forcoollng
this unit.
Warranty
is void if
any
type
of
filtering
device is
used
at
intake air passages.
300
2~0
200
350~,
___________________________________
This unit is
capable
of both
pulsed
and
no
npuised
opera-
.5
20
2~
30
40
50
60
0
Sc
90
00
tion. The
welding
power
source
compensates
for line
a-ia
983
voltage
fluctuation
of –10%.
OM-1 26 853
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