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HVAC Industry

[Case Study] The application of UniMAT SMART PLC in the heating industry!

[Case Study] The application of UniMAT SMART PLC in the heating industry!

For the sake of the national environment and the improvement of urban infrastructure, it is imperative to transform the old-fashioned heating. Now the central heating system includes three parts: heat source, heat network and heat user.
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UniMAT PLC in automatic cold storage industry -- A case study

UniMAT PLC in automatic cold storage industry -- A case study

With the upsurge in the consumption of Flammulina velutipes, the "factory production" of Flammulina velutipes has emerged in the north and south. The only indispensable thing is the low-temperature fruiting room. The cold storage requires refrigeration rooms, low-temperature halls, freezing rooms, and pre-cooling rooms. The temperature control of each unit is different, and each unit needs to operate independently to adjust the temperature and control, and also needs to coordinate networking and monitoring management.
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PLC in Evian Regenerative Electric Boiler:A Case Study

PLC in Evian Regenerative Electric Boiler:A Case Study

The regenerative electric boiler is a new type of high-efficiency and energy-saving electric heating product launched according to the policy of the electric power department to encourage the use of electricity for heating during low-peak periods and to enjoy preferential electricity prices. Auxiliary equipment, heat storage tank, constitutes a regenerative electric boiler system. This case takes this as an example to analyze the application of the product in the HVAC industry.
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UniMAT's Successful Implementation in the HVAC Industry: A Case Study

UniMAT's Successful Implementation in the HVAC Industry: A Case Study

Introduction:
In the field of heating, ventilation, and air conditioning (HVAC), the integration of advanced automation systems plays a vital role in ensuring efficient and reliable operation. This case study highlights the successful deployment of UniMAT, a renowned service company specializing in industrial automation, in collaboration with a fictional HVAC company named ComfortTech. The UniMAT solution utilized the ST40 CPU and AR 04 resistance temperature detector (RTD) module. This case study showcases the project's one-year milestone, highlighting its stable performance and absence of any issues.

Client Overview:
ComfortTech is a leading HVAC service provider, catering to various commercial and industrial clients. With a commitment to providing optimal indoor climate control solutions, they sought to enhance their HVAC system's efficiency and reliability through the implementation of advanced automation technology.

UniMAT's Solution:
UniMAT, an industry expert in industrial automation, proposed a comprehensive solution to meet ComfortTech's requirements. The UniMAT team recommended the utilization of the ST40 CPU, a powerful and versatile programmable logic controller (PLC), in conjunction with the AR 04 RTD module, designed specifically for temperature measurement applications.

Implementation and Integration:
The implementation process involved close collaboration between ComfortTech and UniMAT's team of automation experts. The UniMAT team performed a detailed analysis of ComfortTech's HVAC system, identifying areas where automation could improve efficiency and control. Based on the analysis, the ST40 CPU was selected for its robust performance and extensive programming capabilities, while the AR 04 RTD module provided accurate and reliable temperature sensing.

Installation and Commissioning:
After the selection of UniMAT's solution, the installation and commissioning phase began. UniMAT's experienced technicians seamlessly integrated the ST40 CPU and AR 04 RTD module into ComfortTech's HVAC system. They ensured proper wiring, configuration, and programming, taking into account the specific requirements of the system.

Operational Performance:
Following the successful installation, ComfortTech experienced a noticeable improvement in the performance of their HVAC system. The UniMAT solution, powered by the ST40 CPU and AR 04 RTD module, provided precise temperature control and real-time monitoring, optimizing energy consumption and enhancing comfort levels within the facilities.

One-Year Milestone:
As the project reached its one-year mark, ComfortTech reported uninterrupted operation and stable performance of their HVAC system. The UniMAT solution demonstrated reliability, with no reported issues or malfunctions throughout the year. ComfortTech expressed satisfaction with UniMAT's prompt customer support and regular firmware updates, ensuring their continued confidence in the system's long-term reliability.

Conclusion:
The successful collaboration between ComfortTech and UniMAT exemplifies the benefits of leveraging advanced automation technology in the HVAC industry. Through the implementation of UniMAT's solution, utilizing the ST40 CPU and AR 04 RTD module, ComfortTech achieved enhanced system performance, improved energy efficiency, and optimal climate control. This case study highlights UniMAT's commitment to delivering quality automation solutions and its ability to provide reliable, stable, and long-term performance to meet the evolving needs of the HVAC industry.
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[Case sharing] Application of UniMAT SMART PLC in low-pressure boiler!

[Case sharing] Application of UniMAT SMART PLC in low-pressure boiler!

01 background

With the development of the power industry, some cities with sufficient power have put forward higher requirements for environmental protection, which has prompted the rapid development of the boiler industry, and the boiler industry has rapidly developed from traditional technology to modern technology.

02Equipment technology

By adding a strong electrolyte to the water and passing a strong current for ionization, the ions ionized by the strong electrolyte will combine with water molecules to form hydrated ions. This process is exothermic, and the heat is used to heat the water to achieve the purpose of boiler heating.

03HMI screen

04 Configuration scheme

name order number quantity
CPU SR40 UN 228-1SR40-0AA0 1
EM AM03 UN 288-3AM03-0AA0 1
UH307E UH307-2EU01-0AA0 1

05Product advantages

Edimensional SMART PLC PID precisely controls the temperature, is highly compatible with Siemens smart, and is fully compatible with Siemens hardware and software. The program does not need to be modified, and it can be used immediately after downloading, which not only ensures the stability of customers' products, but also reduces costs.

 

06 Summary

With the continuous development of the world economy, my country's traditional industries also need continuous development and progress, as well as advanced concepts and technologies. With automation, product changes can be better realized.

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Application in CTM operation room

Application in CTM operation room

1、 Proface

  With the improvement of people's quality of life and the continuous investment in medical reform, it is very important to improve the comfort, economy and reliability of the central air conditioning system in the operating room. Using advanced, practical and reliable programmable controller (PLC) to control is the mainstream of the current central air conditioning control system. This paper introduces the application examples of UniMAT high performance small UN200 PLC and Siemens text display TD400 plus UniMAT extension module in central air conditioning. The superiority and economy of UniMAT high performance small UN200 PLC and extension module in this field are expounded from the aspects of CPU configuration and intelligent hybrid module.

   2. System overview

    

 

The automation control system of this project chooses UN 200 PLC series and I/O expansion module. The PLC sampled the temperature and humidity of the return air and supply air in the operating room through the analog input expansion module, controlled the 0-100% opening of the chilled water valve and humidifier through the analog output expansion module, and controlled the electric heating through the digital output. Cold, heating, humidifying and dehumidifying control of operation room's constant temperature and humidity

3.system configuration

The system adopts CPU and module combination as follows: UN 224+TD400+UN231+UN232. Two RS485 ports are used to connect TD400, two ports are connected to operation room information panel through MODBUS protocol. The actual picture of operation room and information panel is as follows

The overall design logic is: Doctors or nurses through the operating room information panel to control the start and stop of the central air conditioning and adjust the temperature and humidity, when the central air conditioning failure, maintenance personnel can query the alarm content through the local cabinet text display, but also through the PC monitoring computer to query the air conditioning equipment failure. For troubleshooting in time.

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UniMAT PLC Application of HVAC control system in Huainan Tianji power plant

UniMAT PLC Application of HVAC control system in Huainan Tianji power plant

1.Preface

This paper introduces in detail the HVAC control system scheme of 2x600MW supercritical unit in Tianji Power Plant of Huainan Coal-fired Power Base in Anhui Province. It also reveals the application of UniMAT PLC in the control system and provides a solution with higher cost performance for the industry.

 

2.System overview

The system of this power plant mainly includes the central chilled water system of the main workshop area, the hot water heating system of the central heating station in the factory area, the ventilation and air conditioning system of the steam turbine room, the ventilation and air conditioning system of the central control building, the ventilation and air conditioning system of the dust removal and electrostatic precipitation control building. Each system includes the functions of monitoring, programming and data processing. The whole system is set up in manual and automatic mode (switching between local control panel and LCD of centralized monitoring station).

 

 

3.System requirements

Ventilation and air conditioning system of central control building and central chilled water system of main workshop area; ventilation and air conditioning system of steam turbine room; hot water heating system of central heating station in factory area; ventilation and air conditioning system of dust removal and electrostatic precipitation control building are monitored by an independent PLC to ensure the safety of operation and maintenance.

The functions of the control system include:

Centralized monitoring of all monitoring points of the system can also be monitored locally.

All the controlled parameters can be set at the central control station and the local controllers.

With manual control function, the system can be controlled separately during commissioning, maintenance and operation.

It has configuration and programming functions, and has a password.

Display the parameters of each monitoring point, the status of each operating equipment and components, the dynamic graphics of each system and various historical data

It has the following sound and light alarm functions:

Operation equipment failure

The limit of monitoring points

After the equipment fails, it can be manually restarted on the control panel. When the system is running normally, it will be put into operation automatically.

Store the following historical information and display and print. The system has the function of power failure protection, and the standby power supply should meet the requirement of 72 hours continuous power supply.

Cumulative operating hours of running equipment (such as chillers, pumps, cooling towers and fans)

The time and place of equipment failure

Operation condition record within 10 hours before equipment failure

The interlocking time and location of equipment and components, such as interlocking with fire detection system, etc.

Linkage with automatic fire alarm system

When the host of the system fails, the subsystems should be able to work independently and all data, data and programs will not disappear.

 

 

4.System configuration and function realization

According to the system control requirements, the system is divided into centralized control building ventilation and air conditioning system, turbine room ventilation and air conditioning system, dust removal and electrostatic precipitation control building ventilation and air conditioning system, plant district central heating heating station hot water heating system, a total of four independent PLC systems, each system using Siemens (SIEMENS) PLC-300 series CPU + 100 million. The I/O module and accessories of dimension are made up of UN365 extended rack module. The WinCC user interface software and the industrial control unit are used to build the operation monitoring station of the system. As shown in the picture

1). centralized cooling water system in main workshop area

 

The central chilled water system in the main workshop area consists of air-cooled chillers and chilled water circulating pumps. The system is operated in summer. The system is as follows: air-cooled chillers, expanded constant pressure chillers, chilled water circulating pumps, electric switching valves at the inlet of chillers, electronic scale remover of chilled water system, and refrigeration. Water pressure differential bypass valve standby.

Interlocking and PID control: air-cooled water chiller and refrigerated water circulating pump have start-stop linkage control, air-cooled water chiller on-line group control, chilled water system and pressure difference by-pass control, for PID control loop, the chilled water system supply and return water main pipe set pressure difference by-pass valve, control system according to the supply and return water main pipe. Pressure automatically adjusts the water supply flow in the actual system. During the operation and shutdown of the system, the pressure of the system should be maintained in a set range by the expanding water supply and pressure fixing device (completed by the control system equipped with the expanding water supply and pressure fixing device). The expanding water supply and pressure fixing device will have a network signal interface with the automatic control system and output the pressure and fault signals to the automatic control system. Wait.

The automatic monitoring system only monitors the supply/return water temperature of the system, and has the following functions: when the supply water temperature of the system is lower than 5 degrees C (manually adjustable within the range of 0-10 degrees C), the monitoring system should alarm; when the return water temperature of the system is higher than 14 degrees C (within the range of 0-20 degrees C). When it is manually adjustable, the monitoring system should give an alarm; when the water pump is disconnected, the refrigerated water circulating pump should be equipped with a water flow switch or a water pressure differential switch protection device. When the pump is in a low flow state or low dropout, the water flow switch or water differential switch should be promptly reported to the police.

 

 

2). hot water heating system for central heating station in factory area

The hot water heating system of the central heating station includes heat exchangers and heating hot water circulating pumps.

The system runs in winter, specifically as follows: Expansion constant pressure unit, circulating water pump operation, heat exchanger imported electric control valve, heating system electronic descaling instrument operation, system pressure differential bypass valve standby.

The start of the system is manual, that is, the operator starts the program manually. The starting sequence should be as follows: starting the corresponding circulating water pump, electronic descaling instrument, delayed starting the corresponding heat exchanger inlet steam control valve.

The system's shutdown procedure is manual, which is initiated manually by the operator. The order of shutdown is opposite to the startup sequence.

The system should be set to start automatically according to the outdoor temperature. When the outdoor temperature is lower than 5 degrees C (the setting value should be adjustable: 0 ~ 15 degrees C), the system will start automatically.

The hot water circulating pump interlocks with the steam valve in front of the steam-water heat exchanger, and the steam valve is opened after the hot water circulating pump is started. Conversely, the hot water circulating pump shuts down the steam valve before shutting down to ensure that the steam temperature is not too high, to protect the steam-water heat exchanger coil.

The temperature control, protection and alarm of the water supply and return of the system: the heating hot water supply temperature of the system is 95 C, and the return water temperature is 70 C. The automatic control system monitors the supply/return water temperature of the system and controls the steam regulating valve in front of the heat exchanger by comparing the measuring point of the supply water temperature with the setting point (95 degree C). At the same time, the necessary protection and alarm functions are set up for water supply temperature and backwater temperature.

The monitoring system should alarm when the water supply temperature of the system is higher than 100 C (manually adjustable in the range of 70 110 C), and when the backwater temperature of the system is lower than 55 C (manually adjustable in the range of 30 70 C), the monitoring system should alarm.

Pressure differential by-pass valve is installed in the main water supply and return pipe of the heating water system in this project. The control system automatically adjusts the water supply flow in the actual system according to the pressure on the main water supply and return pipe. This is the PID regulating loop.

During the operation and shutdown of the system, the pressure of the system shall be maintained within a set range by the expanding water supply and pressure fixing device provided by the demander (completed by the control system equipped with the expanding water supply and pressure fixing device). The expanding water supply and pressure fixing device shall be equipped with a network signal interface with the automatic control system, and the pressure of the system shall be output to the automatic control system. Fault signal and so on.

Water pump interruption alarm: The hot water circulating pump of this system should be equipped with water flow switch or water pressure differential switch protection device. When the pump is in low flow state or low pressure difference, the water flow switch or water pressure difference switch should alarm in time.

 

 

3). ventilation and air conditioning system in unit control room of centralized control building

The ventilation and air conditioning system of central control building unit control room will include 20.20m floor HVAC equipment room, 13.70m floor centralized control room, shift room, SIS room, engineer room and so on.

Unit switching control: the two air handling units in the air conditioning system are reserved for each other, and the operation switching of the air handling unit is manual/automatic according to the number of operating hours of the unit. The operating hours reach the predetermined value of 720 hours (the operating hours should be manually adjustable between 0 and 1000 hours).

The start of the system is manual, that is, the operator starts the program manually. The starting sequence should be as follows: opening the electric switching baffle and the new exhaust regulating baffle at the inlet and outlet of the corresponding operating air treatment unit, starting the blower and the return blower of the corresponding unit after 120 seconds delay (the delay time can be adjusted manually in the range of 0-240 seconds).

The system's shutdown procedure is manual, which is initiated manually by the operator. The sequence of shutdown should be as follows: stop the operation of the return fan and the blower in the corresponding air treatment unit, delay 120 seconds (the delay time can be adjusted manually in the range of 0-240 seconds), close the electric switching baffle and the new exhaust baffle at the inlet and outlet of the air treatment unit.

The system is divided into three operating conditions, namely, summer operating conditions, winter operating conditions and transitional season ventilation conditions. Under various operating conditions, the state of the equipment and components of the system is as follows:

Summer operating conditions: the air supply fan and return fan in the air treatment unit put into operation, the air supply and return switching baffle, new exhaust regulating baffle open, exhaust baffle, fresh air baffle are in the minimum opening; heating coil outlet of the electric two-way valve closed, cooling coil outlet of the electric two-way valve, humidifier into waiting The machine state, its operation will be adjusted according to indoor temperature and relative humidity, indoor temperature and humidity to the central control room as the benchmark.

Transition season operating conditions: the air handling unit in the fan and return fan into operation, feed and return switching baffle open, exhaust baffle, new exhaust regulating baffle, fresh air baffle, humidifier (including humidifying pump and solenoid valve) into standby state, its operation will be adjusted according to indoor temperature and relative humidity; However, the electric two way valve at the outlet of the hot water coil pipe is closed.

Winter operating conditions: the air supply fan and return fan in the air treatment unit put into operation, the air supply and return switching baffle, new exhaust regulating baffle open, exhaust baffle, fresh air baffle are in the minimum opening; cooling coil outlet of the electric two-way valve closed, heating coil outlet of the electric two-way valve, humidifier into waiting The machine state, its operation will be adjusted according to indoor temperature and relative humidity, indoor temperature and humidity to the central control room as the benchmark.

Switching of operating conditions

There are two ways to switch the operating mode of the system, that is, manual switching and automatic switching.

When manually switching, the operator will manually switch on the control panel.

When switching automatically, the control system will switch according to the requirements of various operating conditions. Automatic switching will be based on the cumulative continuous time (at this time the set value should be adjustable in the range of 0-48 hours) outdoor temperature measurement signal and the set value (sub-summer operating conditions transition season operating conditions and transition season operating conditions in winter operating conditions two, the set value should be adjustable in the range of 0-30 degrees C) The operation condition of the system is determined.

System and indoor temperature and humidity control: The system temperature and humidity control will be based on the temperature and humidity of the central control room as a benchmark to control the indoor temperature and its precision set value refer to the indoor design parameter table. The temperature setting value is manually adjustable in the range of 10 C 35 C and the precision is manually adjustable in the range of 0.1 C 5 C. The temperature and humidity of the central control room are detected by two points, and the other rooms are detected by one point in each room to show the temperature and humidity of the room.

High and low limit alarm of indoor temperature and humidity in central control room: high limit temperature is 28 degrees C, low limit temperature is 18 degrees C, high limit relative humidity is 70%, low limit relative humidity is 30%;manually adjustable, precision in the range of 0.1 degrees C to 5 degrees C manually adjustable.

Indoor temperature control: according to the indoor temperature sensor (set a) detection value and indoor temperature setting value comparison, to adjust the opening of the electric two-way regulating valve, so that indoor temperature is maintained in a certain range.

Interlocking protection control with fire control system

When the fire control system sends out a fire signal (any room within the scope of the ventilation and air conditioning system) to the control panel of the system, the control system will stop the system operation, and feedback signal to the fire control center.

7). dedusting and electrostatic precipitator control building #1 furnace 380V electrostatic precipitator distribution room cooling ventilation system

System startup procedure and shutdown procedure

The start-up sequence of the system is manual. The starting sequence is as follows: opening the electric switching baffle at the inlet and outlet of the corresponding operating air treatment unit, starting the blower of the corresponding unit after 120 seconds delay (the delay time can be adjusted manually in the range of 0-240 seconds); the shutdown procedure of the system is manual, and the order of shutdown is: stopping the corresponding air. After 120 seconds delay (the delay time can be adjusted manually in the range of 0-240 seconds), the electric switching baffle and fresh air baffle at the inlet and outlet of the air handling unit are closed.

This cooling ventilation system is divided into summer operation and transition season.

The equipment and components of the system are as follows: the fan in the air handling unit is put into operation in summer; the air supply and return baffles are opened and the fresh air baffles are located at the minimum opening; the electric two-way valve at the outlet of the cooling coil enters the standby state, and its operation will be adjusted according to the indoor temperature and the relative humidity of the return air. The relevant system - the chilled water system is in operation and the exhaust fan is out of operation.

The equipment and components of the system are as follows: the blower in the air treatment unit is put into operation; the air supply baffle is opened, the return baffle is closed, and the fresh air baffle is maximum opened; the electric two-way regulating valve at the outlet of the cooling coil is closed; and the exhaust fan is operated.

Indoor temperature control: In this system, the set value of indoor temperature and its precision of 380V ESP distribution equipment of boiler # 1 is: 30 C 2 C in summer and excessive season; not controlled in winter. The temperature setting value is manually adjustable in the range of 10 C to 40 C, and the precision is manually adjustable in the range of 0.1 C to 5 C. Temperature control should be based on the indoor temperature sensor detected by the indoor temperature actual value and set value comparison, control the air treatment unit cooling coil outlet pipe electric two-way control valve opening, so that the air temperature to maintain within a certain range.

Indoor temperature alarm of switchgear room: high limit temperature is 35 degree C.

Low flow protection and alarm of blower in air handling unit: The blower in air handling unit of this system should be equipped with air flow switch or differential pressure switch protection device. When the blower or return fan is in low flow state or low pressure difference, the air flow switch or pressure difference switch should alarm in time.

Pressure differential protection and alarm of air filter in air treatment unit: Pressure differential switch protection device should be installed for the primary air filter in air treatment unit of this system. When the air filter air filter is larger than the differential pressure setting point, the differential switch should alarm in time.

Interlocking protection control with fire control system: When the fire control system sends out a fire signal (any room within the scope of the ventilation and air conditioning system) to the control panel of the system, the control system will stop the system operation and feedback signal to the fire control center.

8). dedusting and electrostatic precipitator control building #2 furnace 380V electrostatic precipitator distribution room cooling ventilation system

With the cooling and ventilation system of 380V ESP distribution equipment room of No. 1 boiler in the same ash removal and ESP control building, the corresponding KKS number was changed from 70SAU20 to 70SAU30 and 70QKU10 to 70QKU20.

9). air conditioning system in control room and ash removal main cabinet room

The air conditioning system of control room and ash removal main cabinet includes air handling unit and fan.

A. The starting sequence of the system is manual. The starting sequence is: opening the electric switching baffle at the inlet and outlet of the corresponding air handling unit, and starting the blower of the corresponding unit after the delay of 120 seconds (the delay time is manually adjustable in the range of 0-240 seconds). B. The shutdown procedure of the system is manual, and the order of shutdown is as follows: stop the operation of the blower in the corresponding air treatment unit, delay 120 seconds (the delay time can be adjusted manually in the range of 0-240 seconds), close the electric switching baffle and the fresh air baffle at the inlet and outlet of the air treatment unit.

The air conditioning system operates in summer and winter. Summer: the air supply fan in the air treatment unit put into operation; fresh air, supply air, return air baffle open; heating coil outlet electric two-way valve closed, cooling coil outlet electric two-way valve into standby state, its operation will be adjusted according to indoor temperature and return air relative humidity; related system - refrigerated water The system goes into operation. Winter: the air supply fan in the air treatment unit is put into operation; fresh air, supply air, return air baffle open; cooling coil outlet electric two-way valve closed, heating coil outlet electric two-way valve into standby state, its operation will be adjusted according to indoor temperature and return air relative humidity; related system - refrigerated water system The system is in operation.

Temperature and humidity control system will be based on the average temperature of each room as a benchmark to control the system indoor temperature and its precision set values are: summer can be set to 26 [C] [2] C; winter can be set to 18 [C] [2] C. The temperature setting value can be adjusted manually in the range of 0 C to 40 C, and the precision can be adjusted manually in the range of 0.1 C to 5 C. Indoor temperature detection: each room has 1 points.

Temperature control should be based on the indoor temperature sensor detected indoor temperature actual value and set value comparison, control the air treatment unit cooling coil / heating coil outlet pipe electric two-way control valve opening, so that the supply air temperature to maintain within a certain range.

Low flow protection and alarm of blower in air handling unit: The blower in air handling unit of this system should be equipped with air flow switch or differential pressure switch protection device. Air blower

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UniMAT PLC Application in HVAC industry

UniMAT PLC Application in HVAC industry

This project is a control system for the radar workshop of a military factory. The system is divided into three subsystems: water system, air conditioning system and acid-base exhaust system. Because of the importance of the project workshop, the dust-free room in the design is planned for the 10000-class construction design. The control accuracy of the dust-free room is 0.5 + and 5%. Pressure to keep the room +12Pa

1.Industry profile

The automatic control of HVAC system plays a very important role in ensuring the rational operation of the air conditioning system itself, reducing manpower and realizing safe operation, and it also plays a great role in promoting the development of HVAC system and technology. In the past few years, the automatic control of HVAC mainly relies on DDC control, but technicians gradually find that DDC can not achieve the desired goals for some projects with high control accuracy. PLC, which is widely used in industrial control, has gradually replaced DDC control in HVAC industry. In some large and complex projects, it is found that PLC has absolute advantages over DDC in both practicality and economy. UniMAT PLC with its powerful CPU control and unique module configuration optimization has gradually become the industry's preferred trend。

 

2.Project introduction

     This project is a control system for the radar workshop of a military factory. The system is divided into three subsystems: water system, air conditioning system and acid-base exhaust system. Because of the importance of the project workshop, the dust-free room in the design is planned for the 10000-class construction design. The control accuracy of the dust-free room is 0.5 + and 5%. Pressure to keep the room +12Pa。The control points of the project are as follows:

 

3.Project configuration

The control system is divided into two control areas, water system and exhaust for a control area, dust-free room MAU and DC and FFU control system for a control area. Because some first-line brands of single temperature band transmitter sensors are more expensive, considering the economy, we use a single temperature sensor for resistance, other sensors for voltage type.

In the control scheme of the water system and exhaust system, the temperature is 4, and the other sensors are 10. AO output is 11, there are 11 PID control loop, in the configuration of 200 series of PLC maximum expansion function for seven modules. The best economic consideration is as follows,

UN216-2AD23-0XB0

UN231-0HF22-0XA0

UN235-0KD22-0XA0

UN231-7PC22-0XA0

UN232-0HD22-0XA0

UN232-0HD22-0XA0

UN232-0HB22-0XA0

 

 

 

Comparing with the same type of PLC of Siemens brand, we can find that UniMAT PLC has obvious advantages in both the function of CPU and the optimized configuration of modules.

In this control requirement, the clean room is designed as MAU fresh air system and indoor DC (dry coil) system,

UN216-2AD23-0XB0

UN231-0HF22-0XA0

UN231-7PC22-0XA0

UN232-0HD22-0XA0

UN232-0HD22-0XA0

UN232-0HD22-0XA0

UN221-1BF22-0XA0

 

4.Water control requirements

 

1). In the cooling water system, according to the temperature of the cooling water, the number of cooling towers started and the opening of the cooling bypass valve are controlled. To ensure the normal operation of the refrigerator.

2). The opening of the pressure difference bypass valve is controlled according to the pressure difference in the chilled water system.

3). Acid and alkali exhaust control the frequency of acid and alkali exhaust according to the pressure difference of the air duct.

4). Control of medium temperature water system and PCW heat exchange control the opening of heat exchange valve according to the temperature of water supply. In this system, the control of water temperature is very demanding. When the water temperature control deviation is large, condensation will occur on the surface of the water pipe, which may lead to the failure of the indoor machine. Thereby affecting the pass rate of products.

5). control the opening of steam valve according to the outlet temperature of hot water, so as to ensure the stability of hot water temperature.

 

5.Wind system control requirements

 

1. Control the opening of the fresh air valve according to the pressure inside the room.

2.MAU controls the opening of the preheating valve according to preheating to prevent the cold cracking of the cold dish pipe in winter.

3.Control the cold water and hot water and humidification of MAU according to the dew point.

4.according to the indoor temperature control corresponding to the opening of the DC valve.

5.FFU is divided into 10 groups, each group of 6, when one group of failure can easily find fault equipment. FFU starts in the order of 1-10 delayed start, turn off the other, prohibit 10 groups of simultaneous start, in order to avoid excessive starting current caused by the protection of equipment.

6.Completion analysis

1. Process control: After field debugging, engineers find that the programming method is exactly the same as Siemens, and the field staff do not need to learn new programming methods, thus saving the time of field debugging, and the final control effect, especially PID, is very stable, to achieve the original design of the plan.

2. Cost performance ratio: 2 sets of control systems, such as the use of Siemens domestic PLC can not meet the requirements of points, if the use of Siemens imported module, the corresponding sensors need to use transmitters, in the cost of a great increase. After the adoption of the best PLC optimization scheme, the total cost is at least 50% less than that of SIEMENS.

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