Centrifuge 5804/5804 R and 5810/5810 R
10 Descriptions
10-8 Descriptions
Assembly group "IFACE" PCB
This assembly group contains all components that are needed to operate the centrifuge with a PC or an
Eppendorf-BBUS.
For the RS232 (PC) the MAX233CPP (IC2) is used.
The BBUS operation is done by opto-couplers and is thus uncoupled from the RS232C. This interface is
operated by a BBUS converter which is externally connected or by the Eppendorf BUS system.
By means of the data selector IC (IC1) the signals TXD0 and RXD0 are either switched to the BBUS
interface or to the RS232C interface.
Frequency converter CCI 1000
The frequency converter is used to convert the single-phase alternating voltage into a 3-phase
alternating voltage which powers the 3-phase asynchronous motor (no collector). The output of the
converter is approx. 1100 W. The converter is equipped with a basic data set which can be updated with
the required parameters via the interface.
This makes it possible to adjust optimal acceleration and brake curves, also the power consumption and
the power loss can be reduced to a minimum.
The converter contains the electronic braking circuit which uses the external braking resistors to reduce
the excess energy which is generated (the motor acts as a generator).
MSTM/KW/0408
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