ABB FV4000 Operating Instruction

Contents

ABB FV4000 Operating Instruction Manual pdf 21 page image

Design and functionD184B097U02 FV4000 / FS4000 212.2 DesignG00701x x+AADDZ -12135467 891011121314Fig. 101 Sensor2 Vibration sensor3 Flow sensor4 Amplifier with automatic gain control5 Gain control6 Amplifier7 A/D-D/A converter8 DSP9 FIR 1) filter algorithm and gain control10 Serial interface11 Frequency12 CPU13 Current output14 Switching output1) FIR = Finite Impulse ResponseThe flow and vibration piezo elements from the sensor deliver signals which are forwarded tothe analog-to-digital converter via an amplifier. A gain control mechanism in the DSP controlsgain via the D/A converter. Gain control is used to adapt the necessary signal gain dynamically.The filter algorithm in the DSP evaluates the signals, picks up the flow signal and sends thisfrequency to the CPU for conversion into flow units. This data is then shown on the display andtransmitted on the current and switching outputs or via fieldbus communication.