Preventive Maintenance
SORVALL®
Centrifuges
7.
Fault
Detector
NOTE
The
door
latch
must
be
opened
and closed
after each
fault
to
reset
the
fault
circuit.
a.
With
an
imbalance of
19
grams;
at
1000
rpm
±
500
rpm,
the
fault
detector
does
not
activate (centrifuge continues
running
and
fault
light
does not
illuminate).
b.
With
an
imbalance
of21grams;
at
1000
rpm
±
500
rpm,
the fault
detector
activates
(centrifuge
shuts
down and
fault light
illuminates).
c.
Overtemperature (refrigerated centrifuges
only)—with
rotor
removed, place
temperature sensor
in
a
beaker of
warm
water
(>
+40°C).
The
fault
light
should
illuminate.
d.
Undertemperature (refrigerated centrifuges
only)—open
the front
panel
and
unplug
the
temperature sensor connector (P/J11).
The fault
light should
Illuminate.
e.
Belt Malfunction—remove
access
panel
and
move
arm
ofmicroswitch SW-5.
The fault
light should illuminate.
8.
Door
Latch
a.
With
the
door
shut,
the
latches
engaged,
and the
centrifuge
operating,
the
door
light is
not
illuminated and the
door cannot be
opened.
b.
With
the
door
open
and door light illuminated,
the
centrifuge
will
not start.
c.
Upon
completion
of
a
run,
the
door
cannot
be
opened
until
the
rotor
is below
100
rpm
and
the
door
light
illuminates.
d.
With
the
door
shut
and latched, shut
the
power
switch
off. Locate the
mechanical override and pull
the
metal
loop
down
using
a
screwdriver
or
a
similar
object.
Turn
the
door release
knob clockwise
and
the
door
will
open.
9.
Braking
With
an
H- 1000B
Rotor
(including
empty
buckets) in
place
on
the drive
spindle,
the
speed
control set
for
maximum,
and the brake switch
in the
ON
or
"I"
position,
the
rotor
must
stop
within
150
seconds
maximum.
10.
Door Sealing
Place four
pieces
of
paper
(approximately
3/4 inch wide
x
6 inch
long)
equally
spaced
around
the
top
of the
chamber
door
opening.
Close the door and
latch.
Pull
outward
on
each
piece
of
paper.
All
should fit
tightly and
create
a
frictional
drag as
they
are being
pulled
out.
4-4
Rev.
7/93
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