Sorvall RT/T6000D - Page 275

SORVALL®
Centrifuges
RT6000D, T6000D. RT6000B,
and
T6000B
Centrifuges
Serial
Number
9101800
and
Above
f.
Drive
Belt
Switch
Test
1.
Turn
the
centrifuge
power
ON
and close and
latch the
door.
2.
Depress
the
belt
microswitch at the
base
of the motor
assembly to simulate
a
broken
drive
belt.
The
fault
LED
should
come
on.
3.
Turn
the
speed
and time
control
knobs
ON.
The
rotor
should
not
turn.
4.
Attempt
to unlock
the
door.
It should
be locked and not
allow
access.
5.
Use
the
emergency
override
switch to unlock the
door.
The fault LED
should
extinguish and
the
door
latch should
now
lock
and unlock
freely.
g.
Imbalance Detector
Calibration
Be
sure
to
note
the
following
points
when calibrating
the imbalance circuit:
•
Before starting
the calibration
procedure,
note
the threshold
level value
on
the
field
service
report.
After the calibration
process
is
complete,
also note
the
final
threshold
value.
•
The threshold
adjustment must
fall
between
+0.5
Vdc
and
+4.0
Vdc
as
measured
at test
point
TP-16
(revision
I*
PC
Board)
or
TP-14
(revision
2 PC
Board).
•
Always adjust
the variable
resistor
(potentiometer,
R-146
(revision
I*
PC
Board)
or
R120
(revision
2 PC
Board))
first.
If
you
reach
the
+4.0
vdc
potentiometer
limit
and the rotor
still
does not
trip,
decrease
the
gap
by
turning
the
setscrew
1/8
turn
clockwise for increased
sensitivity.
If
you
reach
the
+0.5 vdc potentiometer
limit
and
the
rotor continues
to
trip,
increase
the
gap
by
turning
the
setscrew
1/8
turn
counter
clockwise for decreased sensitivity.
•
You
can
decrease
the imbalance sensitivity
by
decreasing
the
voltage
level at the
threshold test
point as
measured at test
point
TP-16
(revision
I*
PC
Board)
or
TP-14
(revision
2 PC
Board).
•
The
foam insert
and rubber
boot affect the
sensitivity
of the
imbalance calibration;
make
sure
they are
installed.
•
The
rotor must
slow
to
100
rpm
or
below
before
the
next
run
is started.
•
If
the calibration
produces
"passing"
results,
but
trips during deceleration,
the
calibration
needs
to be
continued.
The
rotor
should
not
trip on
deceleration.
Revision
1
Contol
P.C.
Boards
are actually
reworked revision
0
Control
P.C.
Boards, so
the
designation silkscreened
on
the
board
is revision
0.
Rev.
7/93
9-63