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German company WAT Wärmeaustauschtechnik GmbH manufactures large-scale centralized water-cooled units for use in coal mines. The most commonly used models in such mines are the KM2000 and KM3000; each unit has a cooling capacity of 2.2 and 3.3 MW respectively. The original cooling units were equipped with German BARTEC control systems featuring 15-inch displays, but these systems often failed to operate stably. Considering the stability and reliability of the cooling units’ operation, as well as the consistency, ease of maintenance, and maintenance costs of the control systems in coal mines in the long term, Shandong Gonglenghui Network Information Technology Co., Ltd. assisted its clients in upgrading the local control systems of these cooling units to ones based on Siemens S7-1500 PLCs. The local control systems of the KM2000 and KM3000 refrigeration units have been upgraded from BARTEC control systems to Siemens S7-1500 PLC control systems. The display screen is a Siemens 15-inch touch screen, while the digital and analog components as well as the communication modules are all the latest products from the Siemens 1500 series. After this upgrade, the same functions and performance as the original BARTEC control systems are achieved. In addition, PROFIBUS ports, protocols, and communication address tables are provided, enabling the refrigeration units to be networked and allowing communication with the coal mine’s centralized control system. The upgraded control system has the same operation interface as the original one ； The upgraded system provides precise control over the outlet water temperature of the units; under conditions of relatively stable heat load, there are no continuous fluctuations resulting from the valve being adjusted to increase or decrease the load. The upgraded refrigeration unit boasts the same comprehensive protection features as the original control system, including high and low pressure protection, high exhaust temperature protection, low outlet water temperature protection, oil pressure difference protection, overcurrent protection, and shutdown protection in case of water shortage ； The Siemens 15-inch display supports touch operation; a mouse is used for daily use ； Main monitoring and display parameters: Control methods: local control, remote control, stand-alone control; inlet and outlet temperatures of chilled water; inlet and outlet temperatures of cooling water; set value for outlet temperature; flow rates of chilled water and cooling water; motor current; temperature of motor bearings; temperature of motor windings; vibration detection at the front and rear of the motor; vibration detection at the front and rear of the compressor; suction and exhaust pressures; suction and exhaust temperatures; oil pressure; pressure difference across the oil filter; percentage of valve opening; cumulative operating time of the unit; operating status of the unit; fault alarm display window; other operating parameters required by customers. The upgraded control system reduces the system’s failure rate and enhances the stability, reliability, and efficiency of the control system. Shandong Gonglenghui Network Information Technology Co., Ltd. is an industrial Internet company whose vision is to create a one-stop MRO service platform for industrial refrigeration, thereby becoming the most trusted partner for its customers. Its TikTok-based e-commerce platform, \"Gonglenghui Refrigeration,\" operates on a B2B+O2O model. It not only offers electrical control upgrades for three models of centralized refrigeration units from the German WAT company: KM3000, KM2000, and KM1000, but also provides overhauls for GEA compressors as well as cleaning services for the units’ high-pressure condensers, oil coolers, and evaporators. The platform supplies customers with lubricants and filters for routine maintenance, as well as sensors, valves, controllers, electrical components, bearings, seals, shaft seals, rotors, slide valves, balance pistons, and other parts needed for repairs. It offers comprehensive remote and on-site technical support. With the mission of \"creating more value for customers in the field of industrial refrigeration through an efficient supply chain and high-quality service,\" it aims to ensure customer satisfaction and deliver value to them at all times.