Miller A-500 Manuel du propriétaire - Page 13

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Miller A-500 Manuel du propriétaire
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38.7
VOLTS
0~0ofl ~
37.9 VOLTS
fl0o0~ fl~fl
373 VOLTS
fl0o0~ fl~fl
36,5
VOLTS
oo~oo~
35.8 VOLTS
oo~oo~
35.1
VOLTS
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34.4
VOLTS
32.2 VOLTS
o~oo~o
31 5 VOLTS
oo~o~o oo~o~o
29.3
VOLTS
28.6
VOLTS
~ ~
27.9 VOLTS
27.1
VOLTS
~ 0~fl0~
264 VOLTS
~ ~
25.7
VOLTS
oo~oo fl0~0o
24.9
VOLTS
Positive
Negative
Output
Terminal
Jr
~@fififi~ ~0@~ ~
~
39.4 VOLTS
33.6 VOLTS
fl0ofl ~ ~a~o~o
32
9
VOLTS
oo~o~o
~ooo~o oo~o~o
o~oo~o
o~o~oo
o~oo~o o~oo~o
30.8 VOLTS
o~oo~o
~ ~
303
VOLTS
o~ooo~
o~o~oo
o~oo~o
oo~oo
oo~oo oo~oo oo~oo
24.2
VOLTS
Table 3-2.
Welding
Cable Size
Figure
3-3. DC
Open
Circuit
Voltage
Selection
SCR Circuit
Power
Pilot
Output
Fuse
Circuit
Breaker
Light
Terminal
~~-.--~
I
I
B-049 271
WELDING
AMPERES
TOTA
L
LENGTH OF
CABLE (COPPER
~N
WELOCI ~CUiT
50
100
150
200
250
300
350
400
100
4
4
2
2
2
1
1/0
1/0
150
2
2
2
1
1/0
2/0
3/0
3/0
200
1
1
1
1/0
2/0
3/0
4/0
4/0
250
1/0
1/0
1/0
2/0
3/0
4/0
4/0
2-2/0
300
2/0
2/0
2/0
3/0
4/0
4/0
2-2/0
2-3/0
350
3/0
3/0
3/0
4/0
4/0
2-2/0
2-3/0
2-3/0
400
3/0
3/0
3/0
4/0
2-2/0
2.3/0
3-2/0
2-4/0
500
4/0
4/0
4/0
2-2/0
2-3/0
2-3/0
2-4/0
3-3/0
600
2.2/0
2-2/0
2.2/0
2-3/0
3-2/0
2-4/0
3-3/0
3-4/0
700
2-3/0
2-3/0
2-3/0
2-4/0
3.3/0
3-4/0
4-4/0
4-4/0
~a~a
O.oO.~
~
0
115
Voits
115
Volts AC
Contactor
Receptacle
Receptacle
Controi
Fuse
Receptacle
TA-049
277
Figure
3-4. Front Panel
3-6. WATER CONNECTIONS
On
the left side
of the
rear
panel
are
water
connections
labelled
WATER
IN and WATER OUT. These connections
are
female type
and have
right-hand threading.
It is
recom
mended that the
water
pressure
be
set
between 40 and
60
psi.
A-u02
623
NOTE:
A.
50 FEET
OR LESS.
B.
CABLE
SIZE
IS
BASED
ON
DIRECT
CURRENT
(DCI.
100% DUTY
CYCLE AND
EITHER
A
4
VOLTS OR
LESS
DROP OR
A
CURRENT
DENSITY OF NOT OVER 300
CIRCULAR MILS
PER AMP.
C.
WELD
CABLE
INSULATION
WITH
A
VOLTAGE
RATING TO
WITHSTAND THE OPEN-CIRCUIT VOLT
AGE
(OCVI
OF
TI-tE
WELDING
POWER
SOURCE MUST
BE USED. WHILE
MOST WELDING
POWER
SOURCES
HAVE
AN
OPEN-CIRCUIT
VOLTAGE OF
LESS
THAN
100
VOLTS,
SOME
WELDING
POWER
SOURCES
OF
SPECIAL DESIGN MAY HAVE HIGHER OPEN-CIRCUIT
VOLTAGE.
3- 4. OPEN
CIRCUIT
VOLTAGE
SELECTION
(Figure
3-3)
Behind
the
access
door
on
the front
panel
is
an
18 tap
terminal
board. This
terminal
board
provides
facilities for
changing
the
dc
open
circuit
voltage. Twenty-two
open
circuit
voltages
are
obtainable. To
obtain the desired
open
circuit
voltage,
position
the
six
leads
connected
to
the
terminal board
as
shown in
Figure
3-3.
3- 5. CONTACTOR
CONTROL
RECEPTACLE
(Figure
3-4)
The
CONTACTOR CONTROL
receptacle
is
a
two
pole
twist-
lock
receptacle
that
provides
a
junction point
for
a
Contactor
Control.
In order for open circuit
voltage
to
be present, 115
volts
ac
must
be
applied
to
the CONTACTOR CONTROL
receptacle.
To
suspend
weld
output, 115
volts
ac
must
be
removed
from the
receptacle.
I
IMPORTANT
I
It is
imperative
that
water
flow
through
the
Welding
1
power
source
is
not
interrupted
while the unit is in
use.
Failure
to
comply
may
result in
damage
to
the
main
rectifier
and. transformer
if
the
thermostats
should fail.
When
the
welding
power
source
is
shutdown,
it
is
recom
mended that
water
flow be
stopped.
This will prevent
water
condensation inside the
welding
power
source.
When
the
welding
power
source
is
being
moved
or
during
storage, the
water
should be drained from the unit and the
water
lines
purged
with air
to
prevent
freezing
should the
unit be
exposed
to
freezing
temperatures.
3-7. WIRE FEEDER SHUTDOWN CONTROL
A
set
of
normally-open
contacts
from control
relay
CR2
are
connected
to
terminals 13 and 14 of terminal
strip
iT.
This
set
of
contacts
is intended
to
be
wired
in series with
one
of
OM-233
Page
7