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2.1 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 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
2.2 Power board A1
The power board is a combination of:
• Control panel
• Voltage supply
• Frequency converter
The power board carries out the following tasks:
• Power supply 15 V, DC for imbalance switch and speed sensor
• Power supply 5 V, DC for control panel
• Generating the motor power supply.
(three-phase current with variable frequency and voltage)
Functional description: The mains supply is rectified, smoothened and chopped
into a pulse width pattern in three bridge elements with a
microprocessor.
• Slot for motor with integrated overtemperature switch
• Monitoring the motor current
• Evaluating the overtemperature switch in the motor
• Slot for imbalance switch
• Evaluating the imbalance switch
• Slot for brake resistor
• Triggering the brake resistor
• Slot for speed sensor
• Evaluating the speed sensor pulses (6 per revolution)
• Evaluating the rotor code information
• Slot for lid lock
• Triggering the lid lock magnet at stand still of the rotor
• Evaluating the message line lid lock open/closed
• Communication with the control panel via TTL interface
• Error evaluation
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