ABB FS300R12KE3/AGDR-72C S IGBT Spare Kit

ABB FS300R12KE3/AGDR-72C S IGBT Spare Kit 

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The microprocessor signals the ADC circuitry to begin converting inputs. The ADC circuitry selects the input, reference voltage and conversion operation through the select multiplexer. The input signal from the select multiplexer passes through buffers and a differential amplifier that converts the input signal to a single ended voltage. Then the signal goes to the input of the integrator/de-integrator stage.

The ADC circuitry selects a positive or negative reference voltage for this stage. Once the integrator is set to zero, the ADC circuitry allows the integrator to run until its output reaches the reference voltage. At this point, the ADC circuitry selects the de-integration operation and begins a count until the zero crossing circuit detects the signal at zero. A feedback and zeroing amplifier sets the integrator to zero and the process repeats with the opposite polarity of the input and reference voltage.

The count that the ADC circuitry takes during the de-integration operation is the digital equivalent of the input. It sends that information and the polarity to the microprocessor. The microprocessor places it into memory and signals the ADC circuitry to begin the next conversion.

ABB FS300R12KE3/AGDR-72C S Technical drawing:

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