An electric control redundant control cabinet for a refrigeration plant room

Abstract

The utility model discloses a kind of redundant control cabinet of refrigeration machine room electric control. Including cabinet, electric control module, power module, intermediate relay, wiring terminal, redundancy circuit, frequency converter circuit;Seven installation units are equipped in cabinet, the automatic switching of commercial power and UPS power supply is realized through intermediate relay in power circuit, and power redundancy design is completed.Simultaneously, using water pump control circuit and the interlock of intermediate relay in redundancy circuit, form electric control module and the output mode of two sets of redundancy circuit.When PLC controller is normal, redundancy circuit is disconnected;When it is fault power failure, redundancy circuit automatically conducts and controls water pump operation.The utility model realizes the double redundancy of power and output by low-cost intermediate relay, while significantly reducing system cost, effectively improve the safety and reliability of electric control system.

Description

Technical Field

[0001] This utility model belongs to the field of electrical control cabinet technology, and specifically relates to a redundant electrical control cabinet for a refrigeration room. Background Technology

[0002] Data centers and semiconductor server rooms have extremely high cooling requirements, necessitating the use of refrigeration units. When the refrigeration unit stops supplying cooling, production often halts and products (such as wafers) become unusable. To ensure the normal operation of the refrigeration unit, the safety of the electrical control system must be guaranteed. This is typically achieved through a hardware redundancy system design. However, hardware redundancy systems are expensive; the cost of redundancy for the CPU alone can reach around 100,000 RMB. Therefore, designing a lower-cost electrical control redundancy system control cabinet is a problem that needs to be addressed.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0004] The purpose of this utility model is to provide a redundant control cabinet for the electrical control of a refrigeration room, which achieves the safety design of the electrical control system by setting a low-cost intermediate relay, thereby overcoming the defects in the prior art.

[0005] To achieve the above objectives, this utility model provides a redundant electrical control cabinet for a refrigeration room, comprising a cabinet, an electrical control module, a power supply module, intermediate relays, terminal blocks, redundant circuits, and a frequency converter circuit. The cabinet contains seven mounting units arranged from top to bottom, each separated by a partition with cable trays. The first mounting unit contains a power supply module, the second mounting unit contains an electrical control module, the third and fourth mounting units contain intermediate relays, and the fifth to seventh mounting units contain terminal blocks. The power supply module includes a switching power supply and a power circuit. The switching power supply is connected to both mains power and a UPS power supply via the power circuit. Circuit breakers are installed on the lines connecting the power circuit to the mains power and the UPS power supply. The switching power supply powers the electrical control module and the frequency converter. The electrical control module and the redundant circuit are connected to corresponding terminal blocks. The electrical control module includes a P... The system includes an LC controller, a water pump control circuit, and a PLC controller connected to the water pump control circuit. The inverter circuit is connected to the inverter, and the water pump control circuit, redundant circuit, and inverter circuit are all connected to the water pump. Intermediate relays are installed in the power supply circuit, redundant circuit, inverter circuit, and water pump control circuit. The intermediate relays in the redundant circuit and inverter circuit are one-to-one, with their dry contacts connected in series. The normally closed contacts of the intermediate relays in the water pump control circuit are located in the redundant circuit. The intermediate relays in the power supply circuit switch between mains power and UPS power, providing power redundancy. The intermediate relays in the water pump control circuit and redundant circuit form two output modes: one for the control module and one for the inverter, providing output redundancy. When the control module fails, the redundant circuit can be switched to ensure the normal operation of the water pump.

[0006] Preferably, in the technical solution, the intermediate relay includes a power relay, a redundant relay, a frequency converter operation signal relay, and a water pump control signal relay; the power relay is installed in the power supply circuit and is used to switch between mains power and UPS power; the redundant relay is installed in the redundant circuit, the frequency converter operation signal relay is installed in the frequency converter circuit, the redundant relay and the frequency converter operation signal relay are in one-to-one correspondence, and the dry contacts of the redundant relay are connected in series with the dry contacts of the frequency converter operation signal relay; the water pump control signal relay is installed in the water pump control circuit, and the normally closed contacts corresponding to the water pump control signal relay are installed in the redundant circuit.

[0007] Preferably, in the technical solution, the electrical control module includes a PLC controller, and a water pump control circuit, a digital input module, an analog input module, a digital output module, and an analog output module connected to the PLC controller; the PLC controller is used to receive data detected by the digital input module and the analog input module, and output water pump control information to the water pump control circuit, the digital output module, and the analog output module respectively; the digital input module is used to detect the water pump's operating mode, operating status, and fault information; the analog input module is used to detect the coolant's flow rate, temperature, and differential pressure information; the digital output module is used to output water pump start / stop information; and the analog output module is used to output the frequency information of the water pump's frequency converter.

[0008] Preferably, in the technical solution, the wiring terminals include wiring terminals XT0, XT1, XT2, XT3, XT4, XT5, XT6, XT07, and XT8, wherein wiring terminals XT0, XT1, XT2, and XT3 are located in the fifth mounting unit, wiring terminals XT4, XT5, and XT6 are located in the sixth mounting unit, and wiring terminals XT07 and XT8 are located in the seventh mounting unit.

[0009] Preferably, in the technical solution, the PLC controller is connected to terminals XT1 and XT2, the water pump control circuit is connected to terminal XT2; the digital input module is connected to terminals XT3 and XT4 respectively; the analog input module is connected to terminal XT5; the digital output module is connected to terminal XT6; the analog output module is connected to terminal XT8; and the redundant relay is connected to terminal XT7.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] By using low-cost intermediate relays, power redundancy and output redundancy designs are added to the electrical control system, which significantly reduces costs while improving the safety and reliability of the electrical control system, ensuring the continuous operation of the water pump, and meeting the cooling needs of data centers and semiconductor computer rooms. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the redundant control cabinet for the refrigeration room electrical control of this utility model;

[0013] Figure 2 Electrical schematic diagram for power redundancy design of this utility model;

[0014] Figure 3 This is the circuit diagram of the frequency converter of this utility model;

[0015] Figure 4 This is the electrical schematic diagram of the PLC controller of this utility model;

[0016] Figure 5 This is a redundant circuit diagram of the present invention;

[0017] Figure 6 This is the electrical schematic diagram of the digital input module for chilled water pumps #1-#5 of this utility model;

[0018] Figure 7 This is the electrical schematic diagram of the analog input module of this utility model;

[0019] Figure 8 This is the electrical schematic diagram of the digital output module of this utility model;

[0020] Figure 9 Electrical schematic diagram for output redundancy design of this utility model;

[0021] Figure 10 This is the electrical schematic diagram of the analog output module of this utility model. Detailed Implementation

[0022] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0023] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0024] like Figure 1 As shown, a redundant control cabinet for a refrigeration room includes a cabinet body 1, an electrical control module 2, a power supply module 3, an intermediate relay 4, terminal blocks 5, a redundant circuit, and a frequency converter circuit. The cabinet body 1 has seven mounting units 10 arranged from top to bottom, each unit 10 separated by a partition 11 with cable trays. The first mounting unit 10 contains the power supply module 3, the second mounting unit 10 contains the electrical control module 2, the third and fourth mounting units 10 contain the intermediate relay 4, and the fifth to seventh mounting units 10 contain the terminal blocks 5. The terminal blocks 5 include terminals XT0, XT1, XT2, XT3, XT4, XT5, XT6, XT07, and XT8, wherein terminals XT0, XT1, XT2, and XT3 are located in the fifth mounting unit 10, terminals XT4, XT5, and XT6 are located in the sixth mounting unit 10, and terminals XT07 and XT8 are located in the seventh mounting unit 10.

[0025] The intermediate relay 3 includes a power relay, a redundant relay, a frequency converter operation signal relay, and a water pump control signal relay.

[0026] like Figure 2 As shown, the power module 3 includes a switching power supply and a power circuit. The switching power supply is connected to both the mains power and the UPS power supply via the power circuit. Circuit breakers 1QF and 4QF are installed on the lines connecting the power circuit to the mains power and the UPS power supply, respectively. Circuit breaker 1QF controls the UPS power supply, and circuit breaker 4QF controls the mains power. The switching power supply powers the electrical control module 2 and the frequency converter INV. A power relay KA1 is installed in the power circuit. Under normal circumstances, the UPS power supply powers the switching power supply. When the UPS power supply fails, the power relay KA1 switches the mains power and the UPS power supply, with the mains power supply now powering the switching power supply. This power redundancy design increases the reliability of the electrical control system.

[0027] like Figure 1 As shown, the electrical control module 2 includes a PLC controller, a water pump control circuit connected to the PLC controller, a digital input module, an analog input module, a digital output module, and an analog output module; as shown... Figure 4 As shown, the PLC controller is used to receive data detected by the digital input module and the analog input module, and output control information for chilled water pumps #1-#5 and cooling water pumps #1-#5 to the water pump control circuit, the digital output module, and the analog output module, respectively; as shown... Figure 6 As shown, the digital input module is used to detect the remote / local operation mode, operating status, and fault information of chilled water pumps #1-5 and cooling water pumps #1-5 (not shown); Figure 7 As shown, the analog input module is used to detect information such as chilled water flow rate, chilled water supply temperature, chilled water return temperature, chilled water supply and return pressure difference, cooling water flow rate, cooling water inlet temperature, and cooling water outlet temperature; for example... Figure 8 As shown, the digital output module is used to output start / stop information for chilled water pumps #1-#5 and cooling water pumps #1-#5; Figure 10 As shown, the analog output module is used to output the frequency information of the inverters for chilled water pumps #1-#5 and cooling water pumps #1-#5; the water pump control circuit is equipped with water pump control signal relays KA12-KA14 to receive high-level signals sent by the PLC during normal operation; the PLC controller is connected to terminals XT1 and XT2, and the water pump control circuit is connected to terminal XT2; the digital input module is connected to terminals XT3 and XT4 respectively; the analog input module is connected to terminal XT5; the digital output module is connected to terminal XT6, and terminal XT6 is connected to the water pump start / stop circuit, which is equipped with water pump running relays KA24-KA34; the analog output module is connected to terminal XT8.

[0028] like Figure 3 ,5 As shown, the inverter circuit is connected to the inverter INV, and the redundant circuit and inverter circuit are connected to chilled water pumps #1-#5 and cooling water pumps #1-#5 respectively; redundant relays KA15-KA24 are set in the redundant circuit, the normally closed contacts corresponding to the water pump control signal relays KA12-KA14 are set in the redundant circuit, and the inverter running signal relays KA2-KA11 are set in the inverter circuit; as shown... Figure 9 As shown, redundant relays KA15-KA24 correspond one-to-one with inverter operating signal relays KA2-KA11. The dry contacts of redundant relays KA15-KA24 are connected in series with the dry contacts of corresponding inverter operating signal relays KA2-KA11. Redundant relays KA15-KA24 are connected to terminal block XT7. Through the water pump control circuit, the water pump control signal relays KA12-KA14 in the redundant circuit, and the redundant relays KA15-KA24, two output modes are formed: one for the control module-inverter and the other for the redundant circuit-inverter. This output redundancy design allows switching to the redundant circuit in case of a control module failure, ensuring the normal operation of the water pump.

[0029] When the control cabinet is operating normally, the PLC controller works normally, sending high-level signals to the water pump control signal relays KA12-KA14. The water pump control signal relays KA12-KA14 are energized, and their corresponding normally closed contacts disconnect the redundant circuit. The redundant relays KA15-KA24 are de-energized, and the water pump running relays KA24-KA34 control the start and stop of chilled water pumps #1-#5 and cooling water pumps #1-#5. When the PLC controller malfunctions, the water pump control signal relays KA12-KA14 lose power and have no output. The water pump running relays KA24-KA34 also lose power and have no output. Their normally closed contacts then connect the redundant circuit, energizing the redundant relays KA15-KA24, which control the operation of the chilled water pumps #1-#5 and cooling water pumps #1-#5. By using low-cost intermediate relays, power and output redundancy designs are added to the electrical control system, significantly reducing costs while improving the safety and reliability of the electrical control system, ensuring continuous operation of the water pumps, and meeting the cooling needs of data centers and semiconductor rooms.

[0030] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the present invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the present invention, as well as various different choices and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A redundant control cabinet for electrical control in a refrigeration room, characterized in that: The system includes a cabinet, an electrical control module, a power supply module, intermediate relays, terminal blocks, redundant circuits, and a frequency converter circuit. The cabinet contains seven mounting units arranged from top to bottom, each separated by a partition with cable trays. The first mounting unit contains the power supply module, the second mounting unit contains the electrical control module, the third and fourth mounting units contain intermediate relays, and the fifth to seventh mounting units contain terminal blocks. Each power supply module includes a switching power supply and a power circuit. The switching power supply is connected to both mains power and a UPS power supply via the power circuit. Circuit breakers are installed on the lines connecting the power circuit to the mains power and the UPS power supply. The power supply provides power to the electronic control module and the frequency converter; the electronic control module and the redundant circuit are connected to the corresponding terminals; the electronic control module includes a PLC controller and a water pump control circuit, with the PLC controller connected to the water pump control circuit; the frequency converter circuit is connected to the frequency converter, and the water pump control circuit, the redundant circuit, and the frequency converter circuit are respectively connected to the water pump; intermediate relays are provided in the power supply circuit, the redundant circuit, the frequency converter circuit, and the water pump control circuit, wherein the intermediate relays in the redundant circuit and the frequency converter circuit correspond one-to-one, and the dry contacts between the corresponding intermediate relays are connected in series, and the normally closed contacts of the intermediate relays in the water pump control circuit are provided in the redundant circuit.

2. The redundant control cabinet for the refrigeration room electrical control according to claim 1, characterized in that: The intermediate relays include a power relay, a redundant relay, a frequency converter operation signal relay, and a water pump control signal relay. The power relay is installed in the power supply circuit and is used to switch between mains power and UPS power. The redundant relay is installed in the redundant circuit, and the frequency converter operation signal relay is installed in the frequency converter circuit. The redundant relay and the frequency converter operation signal relay are in one-to-one correspondence, and the dry contacts of the redundant relay are connected in series with the dry contacts of the frequency converter operation signal relay. The water pump control signal relay is installed in the water pump control circuit, and the normally closed contacts of the water pump control signal relay are installed in the redundant circuit.

3. The redundant control cabinet for the refrigeration room electrical control according to claim 2, characterized in that: The electrical control module includes a PLC controller, and a water pump control circuit, a digital input module, an analog input module, a digital output module, and an analog output module connected to the PLC controller. The PLC controller receives data detected by the digital and analog input modules and outputs water pump control information to the water pump control circuit, the digital output module, and the analog output module, respectively. The digital input modules detect the water pump's operating mode, operating status, and fault information. The analog input modules detect the coolant's flow rate, temperature, and differential pressure. The digital output module is used to output water pump start / stop information; The analog output module is used to output the frequency information of the water pump inverter.

4. The redundant control cabinet for the refrigeration room electrical control according to claim 3, characterized in that: The terminal blocks include terminal blocks XT0, XT1, XT2, XT3, XT4, XT5, XT6, XT07, and XT8, wherein terminal blocks XT0, XT1, XT2, and XT3 are located in the fifth mounting unit, terminal blocks XT4, XT5, and XT6 are located in the sixth mounting unit, and terminal blocks XT07 and XT8 are located in the seventh mounting unit.

5. The redundant control cabinet for the refrigeration room electrical control according to claim 4, characterized in that: The PLC controller is connected to terminals XT1 and XT2; the water pump control circuit is connected to terminal XT2; the digital input modules are connected to terminals XT3 and XT4 respectively; the analog input module is connected to terminal XT5; the digital output module is connected to terminal XT6; the analog output module is connected to terminal XT8; and the redundant relay is connected to terminal XT7.

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