Í NDICE DE TABLAS
Capítulo 1. El Sector de la Construcción
1.1.4 Características de la empresa constructora
1.1.4.3 La innovación
18.1 System Objectives
In principle the BMS is to monitor and/or control all equipment. The BMS forms part of the above section of the “Electrical” Specification Scope. The contractor shall cross check all services sections to identify the BMS points schedule.
18.1.1 Performance Objectives
The Contractor shall supply, install, test and commission the Building Management System as detailed below and also as specified in particular system specifications under electrical and mechanical sections.
The Building Management System shall be an IP-based System consistent with latest industry standards operating on a fully open protocol. The BMS system is to run via the projects IT structured cabling system. All distribution field I/O controllers, servers and terminals are to be plugged into CAT 6 data outlets provided as part of the “Structured Cabling” scope of work.
18.1.2 Design Parameters
The proposed system and components shall be compatible with a wide variety of control devices using BacNet, LON, Ethernet TCP/IP ,ModBus and OPC standard for open system communications and other current international communication standards. The BMS shall be capable of being extended with controllers on the BACNET protocol and the LON bus.
18.2 General
18.2.1 System Requirements
Select control components and equipment, suitable to meet system objective requirements. Ensure that system safety complies with BS EN 954-1.
18.2.2 Building Management Systems Provide a building management system, including
Equipment design.
Supply.
Installation.
Commissioning.Ensure all monitoring system equipment is compatible, and does not adversely affect any other equipment installed in the same location. Ensure all monitoring system equipment meets the requirements of:
BS 7671 (IEE Wiring Regulations)
BS EN 60801-2
BS EN 60950-118.2.3 Data Communications Protocols
Arrange the digital data interchange systems using open system protocol.
Standard
BS EN 61030.
Lontalk.
BACNET18.2.4 Integrated System
Provide an integrated system in accordance with BS 7807 for the following sub-systems:
Fire detection and alarm.
Fixed fire extinguishing.
Closed circuit television.
Building management system
Heating and ventilation
Energy management18.3 System
18.3.1 General Requirements
The BMS shall be designed and installed as per the following standards and codes:
Low Voltage Directive 73/23/EEC and amendments 93/68/EEC.
Construction Products Directive 89/106/EEC.
General Product Safety Directive 92/59/EEC
BS 7671 Electrical Installations in Buildings.
BS EN 60439-1 Low-voltage Switchgear and Control Assemblies.
BS EN 50160 - Voltage characteristics of electricity supplied by public distribution systems.
Electromagnetic Compatibility (EMC) Directive (89/336/EEC).
BS EN 61000-6-3 Generic emission standard and BS EN 61000-6-1 and -6-2 Generic immunity standard.
EMC requirements of EN 13646.The BMS System shall be time synchronised via the operator workstation.
Ensure that copies of all BMS vendor-specific software are held by an independent third party and that this software can be released to the client. Licences to use software applications shall be owned by the Client.
Application software shall be in accordance with BS 7649.
The contractor shall provide full support for the BMS for a minimum of 10 years from the date of practical completion.
18.3.2 Operator Workstation
The contractor shall provide a workstation comprising of the following:
Colour 19" LCD flat screen monitor
Keyboard and Mouse
Printer for printing all monitored and logged data (including graphs of logged data).
Latest Windows Operating systemThe control of plant shall be independent of the operator workstation. No control data shall be transferred between field controllers via the operator workstation.
The operator workstation shall communicate with all addressable field controllers and shall provide complete system integrity such that the network of field controllers will continue to fully operate following a failure of the operator workstation.
The operator workstation shall incorporate a data storage management system. The operator shall be prompted to carry out the data archiving procedure at pre-defined intervals. It shall be possible to perform a complete backup of the operator workstation comprising control strategies, set-points and logged data.
Provide an electronic data archive via USB or CD for long term storage of system software, configuration data and logged data.
Allow the transfer of data from the system memory and other storage devices to the archive mediums, and vice versa for the preparation of reports.
18.3.3 Monitoring and Logging
All monitored point data shall be displayed at the operator workstation.
All changes made by the operator shall be logged and identified by both operator name with a date and time stamp.
The operator workstation shall display real time data superimposed on plant schematics with a refresh rate not exceeding 10 seconds.
Any hard or soft-point log shall be displayed and stored on the operator workstation.
Provide Windows based software on the operator workstation e.g. Microsoft Office.
18.3.4 Graphical Operator Interfaces
Provide a software library of plant schematics and symbols, the format/contents of which should be confirmed with the specifier based on samples.
The operator shall be able to generate additional schematics and symbols via the operator workstation.
Graphics shall be displayed and modified in a layered approach (building layout graphics down to plant subsystems and components).
18.3.5 System Alarms
Alarms shall be displayed on a rolling basis in chronological order.
The operator shall be able to acknowledge alarms and mute any audible or flashing annunciators.
The operator shall be able to alter the limits at which the measured values cause alarms to be triggered.
Alarms shall be differentiated by means of alarm type and identification.
Alarms shall be prioritised whereby high priority alarms will be shown regardless of other activity.
Ensure that the reception and acknowledgement of alarms can take precedence over other
Allow the user to acknowledge alarms individually and on a group basis. Acknowledgement should include muting or flashing annunciators.
The operator workstation shall have an alarm review facility.
18.4 Field Controllers
Field controllers shall perform all control actions independently of the operator workstation.
Field controllers shall operate independently if a failure of the BMS communication network is present.
Field controllers shall operate with the loss of shared data via pre-defined default values and final data readings prior to the loss of communications.
All internal field controller enclosures shall have a minimum degree of protection of IP54 in accordance with BS EN 60529. All external field controller enclosures shall be IP65.
Terminals within the field controllers shall be screw down clamp-type fixed to purpose made mountings segregated for different voltages in accordance with BS 7671. Provide minimum 20% spare capacity.
Field controllers shall be fully configured directly via a laptop and via the operator workstation.
18.4.1 Inputs
Inputs to the field controllers shall be as follows:
Analogue inputs
Variable currents (4-20 mA), variable voltages (0-10V) or variable resistances.
The field controller shall detect any open or closed circuit faults and raise an alarm on the operator workstation.Digital inputs
Derived from volt-free contacts (24 volts AC). The interface shall monitor a normally open or normally closed circuit.Pulsed inputs
As derived from volt-free contacts at a pulse frequency of up to 32Hz.All inputs shall be scanned at intervals not exceeding 1 second.
18.4.2 Outputs
Field controllers interfaces shall be capable of providing control signals to actuators and switching devices.
Provide the following interface characteristics:
Analogue output. As variable currents (4-20mA) or as variable voltages (0-10V).
Digital output. Digital outputs shall be selected as 'normally closed' or 'normally open'.The field controller shall be capable of receiving feedback signals which allow the comparison between an output signal to a controlled device and its actual condition.
18.5 Data Monitoring and Logging
The BMS operator shall be able to set the start/stop times and logging frequency at the operator workstation.
Logging shall be selectable between fixed periods or on a rolling basis.
Each log shall be defined in terms of log identification (point identification); units; and date/time stamp.
The field controller shall have sufficient memory to log the equivalent of seven days data at 15 minute intervals for 100% of the total number of physical points on the field controller.
When the logging capacity of a field controller is exceeded, the data shall be automatically downloaded to the operator workstation and archived.
18.6 Internal Power Backup
A rechargeable battery or capacitor shall hold the controller's volatile memory for a minimum period of 2 hours.
A replaceable battery shall be provided and maintain the controller's clock function for a period of two years.
18.7 System Communications
The system communication shall allow the full transfer of monitored, logged, alarm, backup and configuration data between the operator workstation and addressable field controllers.
The protocol shall include an error detection check, error correction, re-try technique and raise an alarm condition upon failure.
18.8 Control Circuits
Ensure control circuits are 230VAC or DC or 230VAC single phase connected one single phase to neutral only.
Where control circuits are taken outside the panel, use 24 volt operating supply.
18.8.1 Control Circuits Transformers
Use transformers in accordance with BS EN 61558-2-9, BS EN 61558-2-23 or BS EN 61558-1 and provide an external label of approved type and size.
Protection – Primary and secondary fuses 18.8.2 Control System Function Charts
Prepare function charts for the control system in accordance with BS EN 60848. Obtain approval of function chart before design of system hardware or writing control software.
Function chart format.
Combined function chart/circuit diagram.
18.9 Sensors
The BMS subcontractor is to supply, install, connect and commission a variety of sensors as set out below and provide the necessary signals to the SCADA system.
Outside air temperature Analog
Tank level: Analog
Hot water: Temperature Supply Loop. Analog
Hot water: Temperature Return Loop. Analog18.10 Signals
BMS I/O and software is to be arranged and connected to accept and provide signals for each of the following equipment items as a minimum, and as additionally detailed in the discipline specification:
18.10.1 General
Hours run total for each circuit/plant/motor
Manual-off-automatic selection
Fault/Alarm/Tripped Indication
Running/Off Indication
Run/Stop Output 18.10.2 Pumps
Output: Start/Stop
Input: Running/Stopped18.10.3 Variable Speed Pumps