Siemens 81000 90H35

Maintenance
Page
18
clamps
.
Replace
the
fuse
clips
if
the
spring
pressure
com
-
pares
unfavorably
with
that
of
other
similar
fuse
clips
.
Make
sure
that
fuses
are
completely
inserted
.
Auxiliary
Contact
Block
Replacement
Located
in
the
drive
chamber
on
both
sides
of
the
electromagnetic
drive
is
an
auxiliary
contact
block
,
consisting
of
two
auxiliary
contacts
.
These
are
actuated
by
the
drive
lever
via
their
own
drive
pins
.
To
replace
an
auxiliary
contact
block
remove
the
particular
side
plate
of
the
drive
chamber
.
Remove
existing
auxiliary
contact
block
.
Wire
up
the
new
auxiliary
contact
,
turn
it
so
that
it
locks
in
the
mounting
angle
and
screw
it
tight
.
Terminals
and
Joints
If
joints
or
terminations
appear
too
badly
discolored
,
corroded
or
pitted
,
or
show
evidence
of
having
been
subjected
to
high
temperature
,
the
parts
should
be
disassembled
and
replaced
or
cleaned
.
Examine
ail
wire
or
cable
connections
for
evidence
of
loose
-
ness
or
overheating
.
Re
-
torque
if
necessary
.
If
major
dis
-
coloration
or
cable
damage
is
apparent
,
replace
the
damaged
parts
.
Recommended
Torque
When
making
bolted
assemblies
,
the
following
considera
-
tions
should
be
generally
followed
.
The
recommended
torque
is
determined
by
the
size
of
hardware
used
.
1
.
Metal
-
to
-
Metal
—
Apply
standard
torque
as
listed
:
2
.
Metal
-
to
-
lnsert
molded
in
compound
part
—
Apply
ap
-
proximately
2
/
3
of
standard
torque
.
3
.
Compound
-
to
-
lnsert
molded
in
compound
part
—
Apply
approximately
1
/
2
of
standard
torque
.
4
.
Compound
-
to
-
Compound
—
Apply
approximately
1
/
2
of
standard
torque
.
Periodic
Cleaning
Accumulation
of
dust
and
foreign
material
such
as
coal
dust
,
cement
dust
,
or
lamp
black
must
be
removed
from
the
con
-
tactor
and
all
surfaces
must
be
wiped
clean
at
regular
inter
-
vals
.
Dirty
,
wet
or
contaminated
parts
should
be
replaced
unless
they
can
be
cleaned
effectively
.
Dust
can
collect
moisture
,
causing
voltage
breakdown
.
Do
not
use
com
-
pressed
air
as
it
will
only
redistribute
contaminants
on
other
surfaces
,
and
may
damage
delicate
parts
.
Figure
18
.
Auxiliary
Contact
Block
Replacement
Fuse
Clip
Inspection
Closely
examine
fuse
clips
,
if
there
is
any
sign
of
overheating
or
looseness
check
the
spring
pressure
or
tightness
of
1
/
2
1
/
2
2
/
3
Standard
Torque
Metal
-
to
-
Metal
(
in
.
-
lbs
.
)
Standard
Torque
Compound
-
to
-
Compound
(
in
.
-
lbs
.
)
Standard
Torque
Compound
-
to
-
lnsert
(
in
.
-
lbs
.
)
Standard
Torque
Metal
-
to
-
lnsert
(
in
.
-
lbs
.
)
Thread
Size
8
-
32
7
-
10
14
-
20
7
-
10
10
-
14
10
-
32
10
-
15
20
-
30
10
-
15
13
-
20
1
/
4
-
20
20
-
30
40
-
60
20
-
30
26
-
40
5
/
16
-
18
84
-
114
168
-
228
84
-
114
110
-
150
3
/
8
-
16
120
-
180
240
-
360
120
-
180
160
-
240
1
/
2
-
13
480
-
600
240
-
300
240
-
300
320
-
400
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