】 【Weak current college building automation control strategy.

<br> <br> 1. air supply unit monitor <br> Monitoring function: <br> The fan motor? monitoring run / stop status, fault alarm, manual / automatic status. <br> Monitoring exports sent fan?, air temperature ., humidity parameters. <br> Fresh air filter on both sides? monitoring pressure in order to understand whether the filter needs to be replaced. <br> Open the air supply valve? monitor on / off State. <br> <br> Control .functions: <br> According to the timetable, the control buildings fan start / stop. <br> Building on air temperature PID control, adjust the cooling / heating coil electric valve opening, so that the air temperature remains within the set value. < .br> Building on air temperature PID control, control valves, steam humidifier makes winter fan outlet air humidity reaches the set value. <br> Chain control: fan? open, fresh air valves, regulating cold / heat coil electric regulating valve, steam humidifier .valve automatic opening; <br> Fan stops, the fresh air valves, regulating cold / heat coil electric regulating valve, steam humidifier valve closes automatically. <br> <br> Protection: <br>? Some reasons in winter when the water temperature .to reduce or stop for hot water, you should stop the fan and close the air supply valve to prevent unit temperature too low freezing air-water heat exchanger; when hot water is returned to normal heating, should be able to start the fan, open .air supply valve, recovery unit to work properly. <br>? An emergency shut down fan, linkage with fire. <br> Second, the air conditioning unit monitor <br> Monitoring function: <br> The fan motor? monitoring run / .stop status, fault alarm, manual / automatic status. <br> Monitoring exports sent fan?, air temperature, humidity parameters. <br> Monitoring back to temperature,? humidity parameters. <br> »Monitoring indoor temperature and humidity parameters. < .br> Monitoring exports sent fan?, air temperature, humidity parameters <br> Monitoring exports sent fan?, air temperature, humidity parameters <br> Fresh air filter on both sides? monitoring pressure in order to understand whether the filter needs to be replaced .. <br> Open the air supply valve? monitor on / off State. <br> <br> Control functions: <br> According to the timetable, the control buildings fan start / stop. <br> Building on air temperature PID control ., adjust the cooling / heating coil electric valve opening, so that the air temperature remains within the set value. <br> Building on air temperature PID control, control valves, steam humidifier makes winter fan outlet air humidity reaches the set value. <br .> Chain control: fan? open, fresh air valves, regulating cold / heat coil electric regulating valve, steam humidifier valve automatic opening; <br> Fan stops, the fresh air valves, regulating cold / heat coil electric regulating valve, steam humidifier valve .closes automatically. <br> <br> Protection: <br>? Some reasons in winter when the water temperature to reduce or stop for hot water, you should stop the fan and close the air supply valve to prevent unit temperature too low freezing air .-water heat exchanger; when hot water is returned to normal heating, should be able to start the fan, open air supply valve, recovery unit to work properly. <br>? An emergency shut down fan, linkage with fire. <br> .<br> The fresh air conditioning system, ventilation system and air supply system combination, we start by controlling fans, as well as control of chilled water valve, air supply valve and return air valve to open degree, to improve indoor air quality, achieve .comfortable, energy-saving purposes. <br> Control as follows: <br> The air conditioner is on or off?, fault alarm, manual / automatic status and switch control <br>? Return air temperature monitoring <br> Wind pressure of .air supply pipe line monitoring <br> Outdoor temperature / humidity »monitoring <br>? Filter pressure monitoring <br>» Air valve and return air valve to open degree adjustable <br> Control principles are as follows: <br>? DDC controller .to return air temperature PID control. By adjusting the frozen water two-way valve to open degree, return air temperature maintained at the set value ranges, when fan is stopped frozen water 2-way valve will be closed. <br>? According to .outdoor air enthalpy throttling fresh air valves / air valve. Fresh air valves / air valve in the software set up of interlocking, while fresh air valve turn return air valve, and vice versa. <br> The pressure differential switch? will monitor the status .of the filter when the filter blockage, the pressure differential switch signals, will be issued to urge the maintenance personnel to clean filters. <br> Fan running and building air valve interlocks, so when fan is stopped, it will completely turn off the air .valve. <br> Fans can advance? compile time holiday program to control the start and stop <br> According to the outdoor temperature /? humidity values to adjust the air supply valve to open degree. <br> <br> Second, water .supply and drainage system <br> BAS system according to the building of the change of water consumption, timely adjustment of system life pump run number to reach the water supply and water demand balance between achieving the best running pump room, high efficiency, low energy .consumption optimization control, so as to achieve the purpose of the operation. <br> According to water supply and sewerage preliminary design, all submersible pump may have a magnetic ball float liquid level controller control, the fire pump consists of a separate control of fire .-fighting system, BAS system on submersible sewage pumps and pumps only prison does not control. <br> Monitor content as follows: <br> The living water tank, tank? high / low water level monitoring and alarm. <br> »Set .the high water level monitoring wells and alarm. <br>? The operational status of living water pump, hand / automatic status, fault alarm and switch control. <br>? Submersible pump operation status, hand / automatic status, fault alarm. < .br>? Fire hydrant pumps and spray pump running, hand / automatic status and fault alarm <br> Refrigerating station control strategy <br> <br> 1, charged with refrigerator and stopping, frozen pump start-up and shutdown, start-stop .cooling pumps, cooling tower of the start-up and shut-down, fill pump start-up and shut-down <br> 2. monitor cooler status, fault, frozen pump status, fault, cooling pump status, fault status, fault, .cooling towers, water level, fill pump status, fault. <br> 3. increase automatic control equipment <br> Increase the current open tube: installed on the cooler side of water supply, Backwater. Secondary side water, backwater. <br> .Increase temperature sensor: one side for the return water temperature, secondary side for return water temperature <br> Increase the pressure sensor: one side for return water pressure, secondary side for return water pressure <br> Increase the flow transducer: a water flow .<br> Increase valve and drive: cooler side for backwater butterfly valve, secondary side for frozen backwater butterfly valves, butterfly valves, pump water cooling pump water butterfly valve. <br> Control of: <br> 1, cooler: cold machine turned .on before you open a side for backwater butterfly valve, secondary side for frozen backwater butterfly valves, butterfly valves, pump water cooling pump water butterfly valve. <br> Verify refrigerant pumps, cooling pump opened after opening of the cooler. <br> Frozen .pump: when a frozen pump does not turn on, immediately open another frozen pump. <br> Cooling pump: when a cooling pump does not turn on, immediately open another cooling pump. <br> Cooling tower: under water temperature determines the number .of open cooling tower. <br> Fill the pump: under water pressure control water. <br> Chilled water and cooling water systems <br> Since chiller by air-conditioned vendors controller separately control, BAS using OPENLINK interface Q9200A and chiller control computer .connected, read information about each unit, chillers, cooling water pumps, cooling towers, cooling water pumps and valves for monitoring. Monitor content as follows: <br> Chiller operation status, hand / automatic status, fault alarm and commitment control <br> .The operational status of chilled water pumps, hand / automatic status, fault alarm and commitment control <br> Cooling water pump running, hand / automatic status, fault alarm and commitment control <br> Cooling fan running, hand / automatic status, fault alarm .and commitment control <br> Cooling tower water valve switching State and switch control <br> Cooling water total for / return pipe temperature monitoring <br> Frozen water total for / return pipe temperature monitoring, water supply pipe flow monitoring. <br> Total .for the chilled water back into the water pressure difference monitoring and by-pass <br> Chiller for cooling and freezing water flow monitoring <br> Cold water machine electric butterfly valve switching State and switch control <br> Cold water machine chilled water outlet temperature .monitoring <br> Unit is powered by color graphics displays all devices running status, fault status, parameters, values and <br> Line parameters with the audio alarm, through the mouse can be arbitrary character set value, in order to achieve the best in .the running state. <br> Unit every point in the list, the parameter values with trend display, alarm display and summary. <br> BAS workstations are available through the system settings of the emergency stop switch signals control the entire chiller tight <br .> Emergency downtime. <br> Can be run on the device for cumulative time <br> Control principles are as follows: <br>? The number control chillers: <br> By frozen water for water temperature difference and water flow out of frozen .water system of cooling load, and according to the actual cooling load in a timely manner to adjust the input operation of chiller and the number of associated facilities in order to achieve the best power-saving state. <br>? Interlocking control: <br .> In order to ensure that the chillers and related equipment in normal operations, control the start and stop the device will make the following order. <br> I. start: frozen water pump → cooling water pump → Tower → freezer <br> Ii .. stop: freezer → freezing water pump → cooling water pump → cooling fan <br> Trouble connecting:? <br> Refrigeration system, each refrigeration / freezing water / cooling water pump / cooling towers each alternate. When any one device fails, the .DDC controller stops the equipment and the equipment of the cumulative elapsed time, start the run-time minimum of similar equipment to ensure the continuous operation of the entire system. <br> Flow switch detection:? <br> When the system detects any one .refrigerator cooling water or chilled water flow switch alarm will stop running on the machine, and put into another unit operation. <br> The by-pass valve pressure difference?: <br> Chilled water system water pressure difference between the total for the circuit .and BA system of differential pressure setting value, the control of pressure differential bypass valve to open degree, to maintain a differential pressure of frozen water system at a reasonable level. <br> »Cooling tower fan start / stop control: <br> Cooling .tower fan with hierarchical control programmes, and the cooling water return water temperature and BA system cooling water return temperature levels set value, the DDC controller determine cooling fan of the number of start / stop. <br> Optimal operation of building refrigeration control: < .br> DDC controller under refrigeration units run cumulative time, every time you boot accumulated time at least one of the refrigeration unit, in order to achieve the balance of the unit operating time. BAS by integrating equipment and chiller control unit communications, the following data .for detection and control: <br> Refrigeration load data; <br> Evaporator pressure too low / too high; <br> Oil pressure too low; <br> Condenser pressure too high; <br> Exhaust temperature is too high; <br .> Oil temperature too high / too low; <br> Fluid temperature is too high; <br> Flow switch failure; water temperature is too low; <br> The water temperature is too low; <br> Line voltage too low; < .br> AC voltage is too low; <br> Prevent duplicate start; <br> Thermocouple open circuit; <br> Evaporator of sensor failure; <br> Power failure; <br> Unit periodic downtime; <br> Air conditioning unit < .br> The fresh air conditioning system, ventilation system and air supply system combination, we start by controlling fans, as well as control of chilled water valve, air supply valve and return air valve to open degree, to improve indoor air quality, achieve comfortable ., energy-saving purposes. Due south of humid air, we at design time only focused on the regulation of temperature, humidity. <br> Control as follows: <br> The air conditioner is on or off?, fault alarm, manual / .automatic status and switch control <br>? Return air temperature monitoring <br> Wind pressure of air supply pipe line monitoring <br> Outdoor temperature / humidity »monitoring <br>? Filter pressure monitoring <br>» Air valve and return air valve .to open degree adjustable <br> Control principles are as follows: <br>? DDC controller to return air temperature PID control. By adjusting the frozen water two-way valve to open degree, return air temperature maintained at the set value ranges, when .fan is stopped frozen water 2-way valve will be closed. <br>? According to outdoor air enthalpy throttling fresh air valves / air valve. Fresh air valves / air valve in the software set up of interlocking, while fresh air valve turn return .air valve, and vice versa. <br> The pressure differential switch? will monitor the status of the filter when the filter blockage, the pressure differential switch signals, will be issued to urge the maintenance personnel to clean filters. <br> Fan running .and building air valve interlocks, so when fan is stopped, it will completely turn off the air valve. <br> Fans can advance? compile time holiday program to control the start and stop <br> According to the outdoor temperature /? humidity values .to adjust the air supply valve to open degree. <br> <br> <br> <br>.