Sorvall RT/T6000D - Run-Interrupt Errors

SORVALL®
Centrifuges
System
Descriptions:
Electrical
Run-Interrupt Errors
Five
different
types
of
errors
can Interrupt
a
run
in
progress
or prevent
a
run
from
starting.
Four
of the five faults will light the fault LED
or
lamp
located on
the front
panel.
The
fifth
fault
does not
light
the fault LED
or
lamp. Any
fault
must
be
cleared before
a
start
sequence
can
be executed;
this
is
done
by
unlatching
and
relatching
the
door
.
The
four
faults
that
light
the
Fault
LED
or
lamp
are:
1.
Improper
drive
belt
tension
2.
Rotor
imbalance
3.
Chamber over-temperature
4.
Chamber
undertemperature
The
fault
that
does not light the Fault
LED
or
lamp
is:
5.
Motor
thermal
overload fuse
Refer
to
the
paragraphs
6-26
through
6-30
for
descriptions
of each
of
these
fault
conditions.
6-26.
Improper
Drive
Belt
Tension
Fault
(refer
to
figure
6-24)
A
drive
belt
tension
switch
(SW5) is
physically
located
on
the
motor mounting
plate
assembly
found
in the
motor
compartment
to
the left
of
the
rotor chamber.
The
switch
detects drive
belt
tension
and/or
belt
breakage.
This
switch is
normally
in the
closed
position,
allowing
+24Vdc
to be
applied
directly to
the
door
solenoid
LI
so
that it
can
be
energized
by
the
zero
speed circuitry.
The
door latch
mechanism
then
unlatches,
allowing
the
user to gain access to
the
rotor chamber.
If
the belt
tension
is
to
loose
or
the
drive belt
is
broken,
the
belt
tension switch
SW5
will
open,
removing
the +24Vdc
to
the
door solenoid
LI
and
preventing
the
user
from
gaining
access to
the
chamber.
The
fault
LED
or
lamp
will
then
light.
This fault
condition
information is
part
of the
start
sequence
circuitry
required
for
the
centrifuge to be
operational.
A
fault
due
to
improper
belt
tension
will
prevent
the
interlock
opto-isolator
device
from turning
on.
which will
in
turn
prevent
motor
control
voltage
from
being
passed
to
the
motor
circuitry.
If
there is
proper
belt
tension, no
fault
will
occur
and the
centrifuge
can
be
started.
If
the belt
tension
changes or
the
drive
belt
breaks
during a
run,
the
run
will
terminate
because
of the
fault.
The
rotor
will
brake
to
stop
if
the
BRAKE
switch
is set to
ON,
otherwise
it will
coast.
The
zero
speed
Indicator
lamp
will
light
but the
door
solenoid
will
not
energize
because
the
+24
Vdc
normally provided
by
switch
SW5
is
missing.
The
emergency
override
mechanism
must be
used to
gain
access
to
the
rotor
chamber
and
to
remove
and
replace
the
defective
drive
belt
(see
paragraph
3-3
for
instructions on
the
emergency
override).
6-29