The control circuit of cabinet-type commercial display cases
split wall-mounted commercial display cases often uses 380V three-phase power supply compared to the power of cabinet units. The control system of the cabinet has more functions, and two forms of display panel, through cover, liquid crystal display and Wang D light-emitting tube are added to show the operation mode of commercial display cases.
At the same time, the cabinet-type commercial display cases control system has a relatively complete protection circuit. When the current passing through the thermal relay exceeds the specified value, the normally closed contact of FR will trip and the normally open contact will be closed. When the system pressure is too high, the contact of the high-pressure controller P will also trip. Therefore, as long as any of the above situations occurs, the coil of relay J2 can be energized. The voltage of the eyelashes S line of J2 action is zero. At this time, the commercial display cases cannot work normally, and a fault prompt will appear on the display panel.
cabinet-type commercial display cases In heating operation, defrosting is also required from time to time to improve the heating effect. To make commercial display cases defrost operation, the following two conditions must be met.
The outdoor heat exchanger pipe temperature is lower than one 10C. At this time, the defrost controller action b. The coil of relay J1 is connected between the V and L wires. Since the voltage of the two wires is 220V, there is no voltage between the two wires, so the JI coil is not energized.
heating operation more than 50nzin. When these two conditions are met at the same time, the main control circuit board issues a command to stop the indoor fan, and the four-way valve is de-energized, and the V line voltage becomes zero, so the coil of JI is energized, and the normally closed contact of J1 is disconnected. Stop the outdoor fan. At this time, only the compressor is working, and the commercial display cases enter the defrosting operation. When the temperature of the outdoor heat exchanger pipeline rises to reset the defrost controller, or the defrosting operation time is more than 10 minutes, the main control circuit board sends a command, the room cliff runs, the four-way valve is energized, and the outdoor fan also runs, commercial display Cases start heating operation.
During maintenance, check the state of line S first. When the S line voltage is zero, check whether the thermal relay, high voltage controller and other protective devices are operating. If the S line voltage is 220V, but the air compressor does not work, the fault is likely to be damage to the AC contactor contacts. This is more common in cabinet-type commercial display cases, and it is usually caused by high current caused by low power supply voltage or frequent contact opening and closing caused by arcing to burn the contacts.
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