Miller ps-100 Manuale d'uso - Pagina 16

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SECTION 6
-
MAINTENANCE & TROUBLESHOOTING
6-1.
ROUTINE MAINTENANCE
IMPORTANT:
Every
six
months
inspect
the labels
on
this unit for
legibility.
All
precautionary
labels
rrvst be
maintained
in
a
clearly
readable
state
and
replaced
when necessary.
See Parts List
for
part
number of pre
cautionary
labels.
WARNING: ELECTRIC SHOCK
can
kill.
Do
not
touch live electrical
parts.
Shut down unit arid disconnect
input
power
employing lockout/tagging procedures
before
inspecting, maintaining,
or
servicing.
Lockout/tagging
procedures
consist
of
padlocking
line disconnect switch
in
open
posi
tion,
removing
fuses from fuse
box,
or
shutting
off and
red-tagging
circuit breaker
or
other dis
connecting
device.
HOT SURFACES
can cause severe
burns.
Allow
cooling period
before
servicing.
Troubleshooting
of internal
parts
to be
per
formed
only by qualified
person.
Table 6-1. MaIntenance
Schedule
FREQUENCY
MAINTENANCE
.
Every
Month
Units in
heavy
service environment
Check weld
cables,
check
labels,
clean internal
parts.
Every
3 Months
Check weld cables
(see
Section
6-lA).
Every
6 Months
Check
all labels
(see
IMPORTANT
block,
Section
6-1).
Yearly
Clean internal
parts (see
Section
6-18).
A.
Weld Cables
Every
three months
inspect
cables for breaks
in insula
tion.
Repair
or
replace
cables
if insulation breaks
are
present.
Clean and
tighten
connections
at
each
inspec
tion.
B.
Internal
CleanIng
Blow
out
or vacuum
dust and dirt from around the inter
nal
con~onents.
Do this
annually depending
on
the lo
cation of the unit and the amount of dust and dirt in the
atmosphere.
If
dirty
or
dusty
conditions
are
present,
clean unit
monthly.
The power
source
outer
enclosure
should be
removed,
and
a
clean
dry
airstream
or vac
uum
suction should be used for this
cleaning operation.
6-2.
FAN
MOTOR
This unit is
equipped
with
an
exhaust fan and relies
on
forced draft for
adequate cooling.
The fan
motor
is
manufactured with lifetime sealed
bearings
and
re
quires
no
maintenance.
6-3.
OVERLOAD PROTECTiON
a
WARNING: ELECTRIC SHOCK
can
kill.
Do
not
touch live electrical
parts.
Shut
down unit and disconnect
input
power
employing lockout/tagging procedures
before
inspecting, maintaining,
or
servicing.
Lockout/tagging
procedures
consist
of
padlocking
line disconnect switch in open
posi
tion,
removing
fuses from fuse
box,
or
shutting
off and
red-tagging
circuit breaker
or
other dis
connecting
device.
a
CAUTION: IMPROPER FUSES
can
damage
unit
Be
sure
replacement
fuses
are same
size,
type,
and
rating (see
Parts
List).
A.
Transformer And Rectifier ProtectIon
The main transformer and rectifier
assembly
are
pro
tected from overload
by
three
normally-closed
thermo
stats
TP1, TP2,
and TP3. TPI and TP2
are
located
in
the main
transformer,
and TP3 is located
in the rectifier
assembly.
If
overheating
of the transformer and/or recti
fier
occurs,
the associated
thermostat(s)
will open
deenergizing
the
output
contactor.
The
welding
power
source
signals
the control console and weld
output
ceases.
If this condition occurs, allow
a
cooling period
before
resuming operation.
B.
Circuit
Board ProtectIon
(FIgure
6-1)
Fuses Fl and F2
protect
both the
+
and
24
volts cir
cuits.
If Fl
opens, 24 volts dc is
not
available
from PCi
to
receptacle
RC2.
If F2
open,
+24 volts dc is
not
avail
able from
PCi
to
receptacle
RC2. The fuses
are
located
on
the
rear
of the circuit board
mounting
bracket inside
the unit. It Is
necessary
to
remove
the unit
top
cover
to
gain
access
to
the fuses.
C.
Fan Protection
Fuse
F4
open when fan
motor
FM stalls
or
draws
exces
sive
current
from the main transformer. F4 is located
on
the
rear
panel
under the windtunnel
by
the
input
conduc
tor
strain
relief. It is necessary
to
remove
the
nght
side
panel
to
gain
access
to
this fuse.
F2544
Pa~~
12