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3.1 Control panel A3
The control panel have only restricted control tasks, it disposes of the following
characteristics:
• Input panel for operation parameters
• Indication elements
• Transmission of the signals to the power board via the interface.
• Storing of centrifuge version
• Storing the machine version and the brake setting.
By means of the machine version the power board is informed which kind of
centrifuge has to be controlled. Then the power board takes the corresponding
values from the ROM.
e.g. Max. Speed
Acceleration and deceleration ramps
• Communication with the power board via TTL interface.
The power supply for the control panel is transmitted via the flat ribbon cable:
Pin 1 GND
Pin 4 +5V
3.2 Power board A1
The power board is an combination of:
• Control panel
• Voltage supply
• Motor-control
The power board carries out the following tasks:
• Power supply 15 V, DC for imbalance switch
• Power supply 5 V, DC for control panel and speed sensor
• Plugging station of the motor
• Control of the motor with triac phase-angle control
• Monitoring of the motor current.
• Braking of the motor with brake resistor
• Plugging station of the imbalance switch (only with EBA 20 C)
• Evaluation of the imbalance switch (only with EBA 20 C)
• Plugging station of the lid lock
• Control of the lid lock magnet at stand still of the rotor.
• Evaluation of the lid lock signal (lid open or closed).
• Communication with the control panel via TTL interface
• Error evaluation.
3.3 Motor M1
• The motor is connected via a plug to the power board.
• The motor is a collector-motor with carbon brushes.
• The motor is controlled by the power board.
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