supermarket refrigerated showcase » article > display freezer > display cases Defrosting and display principle
display cases Defrosting and display principle
display cases Defrosting principle
compressor has been running for 7 hours, CPU will output defrost command from pin 21, and pin 2 of IC4 will be amplified and output by clever pin, display cases control relay RY2 sucks Close, turn on the defrost circuit, the defrost heater will generate heat and defrost. At the same time, the CPU detects the defrosting situation through the 10-pin. Because the defrosting sensor is a thermistor, it converts the temperature at different points into electrical signals and transmits it to the 10-pin of the CPU. When the CPU detects that the temperature of the defrosting sensor reaches 13°C, the output of the defrosting command is terminated at pin 21, and the defrosting work ends. After 7 minutes, the CPU outputs refrigeration commands from pin 20, and the display cases compressors start to run.
display cases The working principle of displays and keyboards. Numerous diodes on the display board are arranged in an orderly manner. Each group of diodes represents a stroke of the digital. The CPU provides row drive for the display matrix via IC7 from pins 16 to 18, and column drive for the display matrix via IC4 from pins 22 to 26. When the freezer compartment adjusting button or the quick-freezing button is pressed, in addition to the relevant control signal output by the CPU recognition and processing, the corresponding voltage combination is output from 15 feet to 18 feet and 22 to 26 feet to control the display to display the corresponding working status .
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