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Sorvall®
Centrifuges
Theory
of
Operation•
The
door
can
be
opened.•
The
drive
motor
is
OFF.•
On
the
temperature
control,
the
red
pointer
Indicates
the
selected
chamber
tem¬perature.•
Motor
relay
K202
and
RUN-HOLD
relay
K205
are
deenergized.The
following
two
steps
are
necessary
to
enter
the
HOLD
mode
from
a
STOP
condition:1.
Place
the
centrifuge
main
power
plug
into
the
power
socket
having
proper
powerrating.2.
Set
the
main
circuit
breaker
to
the
ON
position
.Conditions
necessary
to
enter
the
HOLD
mode
from
the
RUN
mode
are:1.
On
the
RC-5
only.
press
the
OFF
switch.2.
Allow
the
timer
to
advance
to
the
OFF
position,
or
manually
advance
the
timer
tothe
OFF
position.In
addition,
any
one
of
the
following
conditions
will
transfer
the
centrifuge
from
the
RUNmode
to
the
HOLD
mode:1.
Rotor
speeds
above
22
000
rpm
will
activate
the
overspeed
detector
and
cause
thecentrifuge
to
switch
to
the
HOLD
mode.2.
A
rise
in
refrigerated
temperature
will
cause
the
black
pointer
on
the
temperatureindicator
to
reach
a
point
that
is
3°C
higher
than
the
red
pointer
indicates.
Thisaction
will
force
an
automatic
high
temperature
cutoff,
placing
the
centrifuge
in
theHOLD
mode.3.
Momentary
loss
of
power
will
transfer
the
unit
to
the
HOLD
mode.
The
RUN
modeIs
controlled
by
the
RUN-HOLD
relay
K205,
a
latching-type
relay.
A
10
millisecondloss
of
power
will
cause
the
coil
of
this
relay
to
deenergize
and
automatically
switchthe
centrifuge
into
the
HOLD
mode.The
RUN
mode
is
used
to
operate
the
rotor
at
a
preset
speed
and
a
preset
temperaturefor
a
preset
period
of
time.Characteristics
of
the
RUN
mode
are
as
follows:•
RC-5—the
ON
indicator
is
illuminated
and
the
OFF
indicator
is
not
illuminated.•
RC-5B—the
START
indicator
is
illuminated.•
The
door
will
not
open
unless
special
procedures
are
performed.•
On
the
temperature
indicator,
the
blue
pointer
controls
the
refrigeration
cycle
tomaintain
the
desired
rotor
temperature.
The
red
pointer
is
used
to
sense
any
refrig-3-7
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