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2. THEORY OF OPERATION
2.1. DESCRIPTION
The microprocessor system which controls the SORVALL T3 and SORVALL RT3 centrifuges
ensures the operation of the following major elements :
- Management of the operating modes,
- Generation of alternating current amplitude and frequency,
- Adjustable components for the motor speed servo,
- Management of the acceleration and braking profile/rates,
- Management of the temperature regulation (SORVALL RT3),
- Management of the safety devices :
. Lid lock
. Zero speed detection
. Imbalance detection
. Motor over temperature detection.
- Management of fault diagnosis
2.2. COMPONENT LAY-OUT
The input and control devices are located on the front panel and are comprised of a
membrane keyboard and three digital displays.
Everything is controlled by a 16 bit microprocessor. The control program of the centrifuge is
stored in an EPROM.
Data are conveyed into a dynamic RAM and are saved even when the power is down, thanks
to an internal battery, which supplies power.
Service Manual 11290099
page 10 of 44
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