【 Weak current College 】 DDC controller configuration principles---Power By 【 China power house network 】

2.1 device number centralized place

Cooling stations, boiler houses, heat exchanger stations, substations are device central place, shall select bulk DDC controller. For example: Honeywell, Excel5000, XL-500, Siemens600, MBC. XL-500I/O point 128, MBC, I/O module 80 (each I/O module is 1 or 2 or 4 points), which can be extended.

For example, a project to bid the book: XL-500 analog and digital input and output when mixed with 650 $/point, pure digital input and output of 400 Yuan per point. XL-50 analog and digital input and output when mixed with 850 RMB/point (the only controller unit price, not including sensors and actuators).

From the economic conditions taken into account by the visible, conditional use bulk of DDC controller is reasonable.

2.2 process-related equipment requirements, configure the same controller

According to the process-related equipment needs to be configured the same controller, this makes it easier to debug and run (monitoring). For example: the same cold station controller to monitor, control, management, except for chillers, cooling pumps, cooling pump, fill the pump, including from cold station installation distance of cooling towers, expansion tank. Heat source system boilers, boiler circulation pump, boiler feed pump, heat exchanger, secondary heating circulation pumps and boiler related exchanger, circulation pump, water pump, expansion tank (including a different installation location) also belong to the same controller.

2.3 press run time and season configuration controller

According to the above configuration, the device is running, in summer, winter outage winter and summer downtime, year-round operation. The following analysis of general engineering equipment operating season.

Summer operating equipment: chillers, cooling pumps, cooling pumps, cooling tower, dedicated cooling station with variable power distribution equipment.

Winter running equipment: heating with hot water boiler, heating with heat exchangers, boilers, hot water circulation pump (a), the heating circulation pump (second), fuel oil boiler feed pump, boiler feed water pump (in addition to the works of domestic hot water steam boiler heat is used for the quarter, the other for winter operation), geothermal, Sirocco screen with heat exchanger and related circulation pump, water pump, expansion tank, etc.

Year-round operation equipment: domestic hot water steam boiler and steam boiler feed pumps, softener, softening water, condensate tank, condensate pumps, air conditioning repair for air conditioning pump, expansion tank, air conditioners, fans, fan-coil line), domestic hot water with a heat exchanger and circulation pumps, pool heaters, circulation and filtration pump, DOSER, water supply and drainage equipment, exhaust fan, elevators, lighting, power supply equipment, water separator, set water, backwater bypass valve (means heating areas), pool, living with fire and water tank.

You can run all year round in a controller, this makes it easier to press the seasonal maintenance controller, system operation is not affected.

2.4 system 2 and above address bus configuration

2.4.1 no network controller

Some products central station and field controller DDC newsletter only with converter in no network controller, for example: Excel500 central station by xpc-500 or Q7055 converter to connect 3 C-Bus bus, each can add 29 stand DDC controller. SiemensS600 central station by 538-675 exchanger can connect 4 BLN bus, each can add 100 DDC controllers, controller requires communication between work, in conditions of placement in a controller, to accommodate the same C-Bus or same BLN bus, so you can ensure that communication is not affected by the workstation failure and still be able to meet the communication requirements of the process. For example: cold station controller and expansion tank, cooling tower controllers are not on the same controller, but the two controllers should hang on the same bus.

2.4.2 a network controller

Some products central station and field controller DDC newsletter intermediate need to install the network controller. For example: Johnson products central station and DDC controllers will need to install the network controller, which exists in different network controller DDC controller under hanging in any 1 network controller failure circumstances cannot, therefore, such a system work in communication requirements should be housed in the same network controllers hang bus.

2.5 press monitoring object to configure the installation locations

When the monitored object is set to installed across the room, adjacent room and adjacent floors, and is not related to each other mutually independent should fully use DDC controller capacity arrangement in a controller, if you have richness I/0 points, wiring length and to the extent permitted in the product, and is independent of unwanted and other points of DDC newsletter can be arranged in a controller. (SiemensI/O line up 230m, DI/DO: 14AWG-22AWG, AI/AO: 18AWG-20AWG).

2.6DDC controller after comparing different configurations, and then do recommend programmes

On the project according to the monitoring, control, management, equipment and distribution locations, on-site requirements, using different controller configuration options, you need comprehensive comparison to decision recommended scenarios. For example, an engineering equipment distribution, functional, monitor content management requirements has been established to consider the conditions, the use of DDC configuration XL-500 centralized configuration, or with the bus expansion through Lon-Bus XL-500 programme, or a combination with XL-500 and XL-100. When using MBC extended programmes or MBC and MEC combination programme, even there are also multiple scale and MEC MEC configuration scenarios, you need to do some work, from a performance price ratio,Comprehensive comparison with maintenance and do recommend programmes.

2.7DDC controller monitor target for air conditioners, a new fan of configuration

In high-rise buildings, many of the same functions, the same plane of floors, air conditioning equipment layout is the same horizontal position on the same device number. DDC controllers generally choose 1 medium controller 2 conditioner or fan, or a device number often should use large controller. This configuration uses a different controller to monitor, control, management towards the South and North more reasonable. So in the preparation of the post, downtime, temperature setting is on (toward) by groups, and even the floor and towards the group preparing the schedule to run more convenient.

3DDC controller to monitor, control, management principles

DDC controller is building equipment automation, the most important component, it can compile stored procedures, make the device according to the procedure runs, you can capture devices, various preparation, operation, transmission failure status to the workstation, and accept the various command workstation timely transferred to the device and executing agencies to complete the command, it can be seen DDC controller in important role in the system.

DDC controller for building air conditioning ventilation system, the heat source and switching systems, refrigeration and cooling systems, distribution systems, public lighting, elevator and escalator systems for monitoring, control and management. But in design to the implementation of national, sectoral ministries procedures, specifications, requirements, the following talk about the views of the author.

3.1 and fire facilities interface

3.1.1DDC controller cannot monitor firefighting equipment and facilities

Belongs to fire special equipment and facilities are: water, fire fighting hydrants, spraying pumps, with exhaust smoke machine, positive-pressure blowers, fire shutter, fallout first floor elevators, fire elevator, fire elevator catchments sewage pumps, fire, emergency lighting, evacuation signage lights, emergency broadcast, power supply for fire-fighting, fire water storage tank and dedicated exclusively to high water.

3.1.2DDC controller monitoring work and fire equipment and facilities

(1) underground layer of smoke machine: usually design in typical double as exhaust fan. However, a two-speed motor single duct system, low-speed to normal working time exhaust, DDC controller should monitor. When using high speed to fire, the fire controllers monitor. Another is the dual-motor, motors, capacity, often small air motor is typical exhaust, DDC controller should monitor. Another large amount of wind and small air fan is used, when the fire by a fire controller monitoring;

(2) a basement blowers: some works will double as a fire in the basement of blower air, meet regulatory requirements by 50 per cent of the amount of exhaust smoke. This class of device DDC controller in normal working hours should be monitored, as a fan. In fire by a fire starting and stopping the controller monitors and open dedicated outdoor air valve, close the air valve;

(3) the combined domestic and fire water storage tank or high water;

When life and fire and the cistern, the water level drops slightly higher than the fire water level signal, from DDC controller detection after low water level alarm and stop watch domestic water supply, to find causes, to the sink in water, is situated slightly lower than the overflow water DDC controllers with high water level alarm (if set water electric valve, received high signal, the water supply should be immediately shut down the electric valve), duty to find the cause. When the water level below the fire water tank, fire controllers receive low-water signal and the issue of low water level alarm signal.

When life and fire combination of high water, the water level drops slightly higher than the fire water level detection by DDC controllers, should immediately to pump water, but if the water level drop bottom-fire water level, not for living water (use of living water supply pipe installation to restrict elevation), the signal received by the fire controller alarm signal, after find reason. watchkeeping personnel When the water level of a high water tank overflowing level, DDC controllers with high water level alarm, to immediately stop the pump.

3.2 and corresponding electronic control device interface

3.2.1 elevator centrally monitor disk

In the selection of elevator central control disc project, DDC controller is not necessary to monitor the location of elevator cabin only monitors the operating status and fault.

3.2.2 no elevator centrally monitor disk

No lift to centrally monitor disk works, generally only monitors the operating status and fault alarm. To monitor the position of the box, "Beijing Desheng Guosheng information system engineering co., Ltd." binary encoder practices so that you can save a lot of DI. For example, a 30-story building will save 25 points.

3.2.3 sewage pump

General high-rise building have sewage pumps, and supporting electronic control, it is as level (supporting) automatic starting and stopping. DDC controller, therefore, should not be monitoring the starting and stopping only monitoring fault alarm, automatic State, running, or select the level sensor. But owners ordered sewage pump to explicitly provide liquid level sensors and introduced watch the terminals, and requires the manufacturer to DDC controller required contacts connected to terminals.

3.2.4 frequency live feed pump

Many projects use constant pressure variable water supply system. Basically it is supporting EFI electronic control equipment, pump starting and stopping automatically run under pressure. Therefore, DDC controller only monitoring fault alarm, manual, automatic State, running state. Simply matching manufacturer will DDC controller required contacts connected to terminals.