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Commercial refrigeration buzzer and door warning
author: supermarket refrigerated showcase category: walk-in display coolers Views: 562Time: 2016-08-22
commercial refrigeration buzzer and door warning
CPU pin 22 is a commercial refrigeration buzzer. The buzzer power supply is 12V, the buzzer power supply is 12V, and the buzzer frequency is 3.125kHZ. The 19-pin of the CPU is the door warning control terminal of the refrigerator compartment. When the refrigerator compartment is opened, the D8 input circuit of the photocoupler is connected due to the door switch being closed, and the photocoupler outputs a pulse signal to the CPU. If the commercial refrigeration refrigerator door is opened for more than 10 seconds, the CPU will output a buzzer signal from pin 22, and the buzzer will alarm to remind the owner to close the refrigerator door. The CPU self-diagnosis and measurement function are in the control circuit of refrigerated showcase commercial refrigeration. When a device fails, the self-diagnosis function will be displayed by the on and off of the LED. At this time, the function adjustment buttons on the operation panel are invalid and the function display is not correct. After troubleshooting, the functions automatically return to normal. Display the self-diagnosis relationship between the freezer compartment temperature indicator (LED) and each sensor on the display board. If the freezer compartment temperature sensor fails, the corresponding LEDF3F3 will light up. A test function for the main control board is also set in the control circuit. Press the TSl key to test. In the test state, the function adjustment buttons do not work (only the buzzer sound can be heard). Test method and procedure, check the LED: press and hold the commercial refrigeration freezer temperature setting button and the quick-freezing button at the same time, and all the LEDs on the display board will light up at the same time after 1s. After releasing the button, it returns to the previous state.
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