Du Pont SORVALL RC-5 Service Manual page 15

IntroductionSorvall®
Centrifuges1-5.
Trouble
DiagnosisTable
1-4 Is
a
list of malfunctions with
reference
to applicable troubleshooting charts.
Italso
references the circuit in which the trouble
may
be isolated
and the
paragraph
numberwhich
provides
the
circuit theory
of
operation. Service personnel must
read the
theoryof
operation and thoroughly understand
it
before troubleshooting
is
attempted.Table
1-4. Trouble Diagnostic
ChartMalfunctionLoss
of main
powerDrive
motor does not
runDoor
cannot be
openedin
HOLD mode
(RC-5B)Refrigeration
system
isunable
to provide
desiredtemperature
In RUN
orHOLDUpon
pressing
ON
switch(RC-5)
or
START
switch(RC-5B),
ON
lamp
(RC-5)or
START
lamp
(RC-5B)falls
to light, drive
motordoes
not run but
POWERlamp
remains
litCompressor
runs
contin¬uously,
does not
cycle
inRUN
or
HOLD
modeOverspeed
cutout
doesnot
occur. No
systemmode
transfer at
over-speed.
Speed
indicatorinoperative.Tachometer
indicatesoverspeed
at too
highor
too low
rpm.No
speed
controlCircuitPower
distributionand
drive
motorSpeed
control
anddrive
motorDoor
InterlockRefrigerationDrive
motor
enableand
temperaturecontrolTemperature
controlOverspeed
detectionOverspeed
detectionSpeed
controlParagraph3-2,
4-23-2,
4-24-63-2.4-105-2,
5-35-43-2,
4-24-3,
5-53-2.
5-25-4,
5-53-2,
4-83-2,
4-84-6,
7-6ReferenceFigure3-1. 4-14-23-1.3-113-12.
4-24-44-115-1through5-64-1.4-23-3,
5-15-44-94-94-5Table4-14-44-44-115-1,
5-24-55-34-94-8,
4-94-81-6(continued)