Controls, Indicators, and Displays
SORVALL
®
Centrifuges
3-20
DRIVE FAULT AT START-UP
After START was pressed, the microcomputer detected that
the tachometer was not responding as power was applied to
the drive motor, without any indication of a drive fault. May
indicate a motor problem or, if it occurs at same time as Tach
Fault, a tachometer problem. Wait for the rotor to stop
spinning (this could take a few minutes), then use the me-
chanical override to remove all sample from the rotor, un-
plug the centrifuge and contact Thermo Service. Read the
WARNING on page 3-18. (WatchLog Network™ record:
DRIVE.)
DRIVE FAULT DETECTED – CALL SERVICE
The microcomputer detected either that the drive motor was
not responding, or that the tachometer circuit failed. Wait for
the rotor to stop spinning (this could take as long as 30
minutes), then use the mechanical override to remove all
sample from the rotor, unplug the centrifuge and contact
Thermo Service. Read the WARNING on page 3-18.
(WatchLog Network™ record: DRIVE.)
DRIVE FAULT DURING BRAKING
After run termination while the rotor is decelerating and the
drive was working to reverse, either the drive box stopped
responding or a speed increase was detected. Wait for the
rotor to stop spinning (this could take as long as 30 minutes),
then use the mechanical override to remove all sample from
the rotor, unplug the centrifuge and contact Thermo Service.
Read the WARNING on page 3-18. (WatchLog Network™
record: DRIVE.)
FLOOR TEMP SENSOR FAILURE
The chamber floor temperature sensor has indicated either a
temperature above 55°C, or an open circuit. The fault indi-
cates a sensor failure or a refrigeration problem. After the
rotor stops and the chamber door is opened, note if the
chamber is warm – if so, the rotor may be too hot to touch.
Unplug the centrifuge and contact Thermo Service. (WatchLog
Network™ record: FLOOR SENSOR.)
MOTOR CURRENT FEEDBACK FAULT
The microprocessor has detected that the feedback current
returning from the drive motor was improbable based on the
current sent to the motor. The fault indicates a motor/drive
box, power supply, or tachometer problem. Wait for the rotor
to stop spinning (this could take as long as 30 minutes), then
use the mechanical override to remove all sample from the
rotor, unplug the centrifuge and contact Thermo Service.
Read the WARNING on page 3-18. (WatchLog Network™
record: DRIVE.)
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