Du Pont SORVALL RC-5 Service Manual page 186

Sorvall®
CentrifugesCalibration
Procedures2.
The
source voltage must be within 1.0% of the
power
rating specified on
the
back
ofthe
centrifuge.e.
Torque
Trimmer
Potentiometer
R204This
component
limits
current drawn
by
the drive
motor to govern
rotor
speed.1.
Install
an
SS-34
rotor
and latch the
chamber
door.2.
Set the SPEED
control to
21 000
rpm.3.
Place the
system
in the RUN
mode.4.
Adjust
the blue
pointer exactly below
the black
pointer
to activate the
refrigerationsystem.5.
Position the
clamp-on ammeter over
the black
or
white
heavy
gauge
wires
comingfrom
the
main power
switch.6.
After
drive motor
speed
has stabilized and the
compressor
achieves stable
opera¬tion.
adjust potentiometer R204 for maximum rotor
speed
while not exceeding
30
Atotal
current draw. Allow
speed
stabilization after adjustment
then
recheck
therotor
speed and current
draw.§1=3
ZERO SPEED
DETECTORg=TP1
0TP2
QSPEED
CONTROL
TP3
Qr——
^~^—
—iR44,
-<=>-R-epTEMP.
CONTROL"^
^31.|
<=<0>E|
015POWER
STP9QOVERSPEED
DETECTOR|
| H73
P^~
~\\
-,
^0\/ENFORCED
TIMING
CKTTEMP.
CONTROLr
RB4
pTpeQTP70TP8QI
R42
T3R4
3"^LY
|————bFigure
7-1.
Test Point and Adjustment
Locations/orP.C.
Board
Assembly,
PN
500597-3