The analog signal from the RTD temperature sensor can be obtained by the RTD analog signal input module, M-7015P-G, and thus used to measure the suction temperature, discharge temperature, compressor temperature, high pressure liquid, return air temperature, and internal temperature of each fixed point in the cold storage.
Both the ICP DAS I-87053W-G (16 channel DI modules) and the I-87055W-G (8 DI/DO modules) are used to obtain digital signals for compressor status, such as compression operation signals, cooling fan operation signals, evaporator fan operation signals, defrost operation signals, motor overload signals, high-voltage over-high signals, and so on, and can be used as warning signal output to send the digital signals to buzzers and warning lights.
ICP DAS I-87017ZW-G is an analog signal input module with programmable signal range. It can set the specific range of signals for each component input and help protect against 240 Vrms overvoltage and 50 mA overcurrent under 110VDC/VAC conditions. As a result, the I-87017ZW-G was used in this case to obtain the power monitor signals of the refrigerators, as well as the compressor equipment voltage, high and low pressure, and other signals.
The ICP DAS ViewPAC VP-1239-CE7 series is a 5.7″ LCD programmable touch panel controller with an RS-485 communication mode and TCP/IP communication protocol. It is capable of connecting to all I/O modules and receiving Modbus RTU signals, and the collected data is converted to Modbus TCP and sent to the remote control center. The VP-1239-CE7 is the new generation WinCE based InduSoft PAC, which provides professional mathematical calculation libraries and powerful user interface design, allowing relevant data to be presented through visual charts.
Therefore, in this application scenario, the ViewPAC VP-1239-CE7 is used as a controller to monitor the temperature and equipment status of the vaccine storage room. Besides, when the temperature and equipment operation are abnormal, in addition to activating the alarm system and sending alarm messages to the manager, relevant mechanisms can be implemented automatically. In the cooling system, for example, if one compressor fails, the other one will be turned on automatically ; if the temperature of the vaccine storage room is not met, both compressors will be activated simultaneously.
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