Sorvall RT/T6000D - Drive System

SORVALL®
Centrifuges
System
Descriptions:
Mechanical
6-2.
Drive
System
The
centrifuge motor
is shock mounted and drives
the rotor
shaft
through
a
1:1
belt
drive.
The
motor
is mounted
upside down.
resulting
in
a
counterclockwise
rotation
of
the
rotor.
Cooling air
is taken in
near
the
top
of the
brush
end
of the
motor
and is
pushed
out
the
opening
at
the
bottom
end
of the motor
by
an
internal
radial
cooling fan.
The
motor
includes
a
resettable*
thermal overload
device
that
opens
on temperature rise.
An
optical
tachometer
is
located on
the
top
end
of
the
motor
to
sense
speed.
Rotor
speed
will
match
motor
speed
to 1/2
of
one
percent.
Two
gyro
action
drive assemblies
are
available:
(1)
a
diamond hex-shaped spindle
drive shaft (PN
07885)
for
RT6000D. RT6000B.
T6000D. and
T6000B
Centrifuges ONLY.
which allows
use
of the
A/S-400
rotor
(2)
a
square
head
spindle
drive
shaft
(PN
07587)
for
RT6000
and
T6000
Centrifuges,
which
precludes
the
use
of
the A/S-400
rotor
These
gyro
action drive assemblies must not
be
interchanged
between
centrifuge
models.
If
the
diamond
hex-shaped spindle
specified
for
use
in
the
RT/T6000B
and
RT/T6000D
centrifuges
is
mistakenly
installed
in
a
RT6000 orTCOOO
centrifuge.
theA/S-400
can
then
be
installed in the
RT6000
or
T6000;
however,
the
RT6000
and
T6000
are
NOT
designed
to
contain
the A/S-400
rotor
in the
event
of
a
rotor
failure. See
the
WARNING
below.
Both
gyro
action drive assemblies
support
the
full
weight
of the
rotor,
thereby reducing
strain
on
the
motor shaft.
The
gyro
is shock mounted
in
rubber
to
reduce vibration,
particularly
at
the
critical
speed,
and
the flexible shaft
allows the
gyro
to tolerate
minor
rotor
imbalances.
The
rotor must
be seated
on
the
gyro
drive
carefully
to avoid
damage
to
the ball
bearings or
the flexible
shaft.
6-3.
Imbalance Detector
Atransducer is located beside the
motor mounting
plate
on
RT6000D. RT6000B, T6000D,
and
T6000B
Centrifuges
and
on
the
motor mounting plate
on
RT6000
and
T6000
Centrifuges (Serial Number
8601093
and
below).
In
the
event
of
severe imbalance,
the
signal
from the
transducer causes
the
fault
lamp
to light and
power
to
be removed from
the
motor.
Reset is not automatic:
the Imbalance
circuit
will
reset
when
the
door release
knob is rotated
clockwise to
unlatch the
lid
after
the
rotor has
stopped spinning.
Some
RT/T6000
and
RT/T6000B
centrifuge drive
motors have
a
one-time thermal
overload
device
rather
than the
newer,
resettable
version.
The
one-time device
does not automatically reset
after it has been
triggered
by
high
temperatures;
when the
device
is
triggered,
the motor is rendered inoperable and
must
be
replaced.
6-3