TDMM Chapter 14 Flashcards
AHU
Air Handling Unit
BAS
Building Automation System
BIM
Building Information Modeling
BMS
Building Management System
CP
Consolidation Point
DDC
Direct Digital Control
EAC
Electronic Access Control
ESS
Electronic Safety and Security
EMS
Energy Management System
EOLR
End of Line Resistor
A resistor that permits active monitoring of a two wire circuit by using low level current to etect a short or break
HC (FD)
Horizontal Cross Connect (Floor Distributor)
HCP
Horizontal Connection Point
A device in a BAS system that allows coverage area connections to be reconfigured
IB
Intelligent Building
IP
Internet Protocal
MC (CD)
Main Cross Connect (Campus Distributor)
MPTL
Modular Plug Terminated Link
A copper cable with an RJ45 jack on ine end and plug on the other
ROI
Return on Investment
SCADA System
Supervisory Control and Data Acquisition System
A control system, consists of programmable logic controllers (plc), data input and software
TCP
Transmission Control Protocol
Name the two systems that are the basis of an intelligent building (IB)
- Building Automation System (BAS)
- Building Management System (BMS)
Name six functions of the BAS
- HVAC
- EMS
- Lighting Control
- Window and Shade Control
- Digital Signage
- Security
Name two benefits of using a common cabling system for voice, data and BAS systems
- Reduces construction and operating costs
- Creates an opportunity for IB (Intelligent Building)
Name four features that power limited (low voltage) systems have in common
- Telecom cabling
- Transmission characteristics
- Pathway requirements
- Common codes/standards
How often are BAS products and technologies typically updated?
Every five to seven years
What is the typical life cycle of a building structure?
Forty plus years
What is the typical life cycle of an office automation system?
One to three years
What is the typical life cycle of the telecom infrastructure in a building?
Three to five years
Name three important considerations when selecting a BAS
- Flexibility
- Scalability
- Functionality
Name four standard features of a BAS
- Common Interface
- Open system standards
- Internet technology
- Advanced Integration
How much can a total systems integration approach reduce the costs of cabling related changes?
By 25 to 40 percent
Name three benefits of ICT technologies
- Easier software updates
- Reduced maintenance
- Local operation requires only a browser
Name two operational benefits of EAC/BAS integration
- Sharing database records
- Having only one cabling system to administer
Name five benefits of a correctly designed HVAC control system
- Comfortable environment
- Optimized energy consumption
- Improved employee productivity
- Control of smoke in case of fire
- Supports better operations of telecom equipment
What does digital in digital device control (DDC) reference?
The digital processing of data
Name five common strategies used by EMCs to control and monitor power
- Scheduling
- Peak demand load shedding
- Event initiated control
- Energy consumption and demand monitoring
- Optimal starting and stopping of equipment
Name two items utility companies use as the basis of the monthly electricity charges for commercial facilities
- Consumption
- Demand
What is the basis of a consumption charge?
The total amount of electricity used during the monthly period
How do most companies calculate demand?
By measuring the electricity being used during any fifteen minute interval during the monthly billing period
Which EMS program minimizes HVAC operating time by calculating how to achieve occupancy temperature at the start of the day?
Optimum Start
What is the purpose of an optimum stop program for an EMS?
To minimize HVAC operating time by calculating how long stored energy can maintain occupancy temperature at the end of the day
How do night cycle programs maintain temperature limits during periods when the facility is unoccupied
By closing outside dampers and cycling ai r handling units
What does a night purge program use to pre cool the building before the mechanical system is turned on?
Cool night outside air
Which program ensures that only the minimum amount of cooling or heating is used?
Load reset
Describe how a zero energy band program works in an EMS
It creates a dead band where neither heating or cooling is used
Lighting may account for up to what percent of the electrical operating costs in a commercial building?
Forty percent
Name two advantages associated with using low voltage timers for a lighting control system
- Safer than high voltage timers
- More cost effective than high voltage timers
What is one of the simplest forms of lighting control
Fixed power reduction
What is an important safety consideration when using occupancy based lighting control?
Should be easily controlled in entry and exit areas after work hours
Why do vacancy sensors save more energy than occupancy sensors?
Because occupants determine when lighting is needed
Where is daylight harvesting typically used?
In new buildings
What is an advantage of using demand limiting
Provides a kilowatt reduction directionally proportional to amount of lights dimmed and is unnoticeable by occupants
What is the objective of BAS?
To centralize and simplify building monitoring, control, operation and management
Name the three hierarchical levels of microprocessor based BAS controllers
- Field level controllers
- System level controllers
- Management level processors
Why are field level controllers networked on a bus?
So information can be shared with processors at the system and management levels
How do system level controllers respond if the communications bus is lost?
The controller will operate in standalone mode to provide system survivability
What are the primary tasks performed by the management level processor?
Collect, store and process historical data that provide a tool for the long term management and use of a facility
What does BAS software determine?
- How the data interaction takes place
- How the data is displayed
- How printer output is formatted
Why are communications protocols an essential element of BAS configuration?
- Because of the amount of data being transferred from ome point to another
What type of communications protocol did early BAS use?
Poll response protocols
What type of communications protocol do most BAS use today?
Peer protocols
Name four types of signals transmitted and received by BAS controllers
- Analog inputs
- Analog outputs
- Digital inputs
- Digital outputs
What type of sensor sends a two state, on-off, or two position signal to a controller?
Digital input
How does a BAS device control a specific function?
By using input from a device and output from a controller
Which sections of the specifications have traditionally been used to specify cabling for the BAS?
The mechanical and electrical sections
Name three met hods for connecting a BAS device to the horizontal cabling in a star topology
- A coverage area cable and a BAS outlet
- A coverage area cable and an HCP
- The horizontal link terminated directly to the BAS connector
What is the typical size of a coverage area in a commercial building?
~ 23 sqm (248 sqft)
What is the typical size of a coverage area in a commercial indoor parking area?
One coverage area every 50sq m (538sqft)
What is the typical size of a coverage area in a mechanical room?
One cover area every 5sq m (54sqft)
What is the purpose of an HCP?
To allow a coverage area connections to be reconfigured
How many HCPs should be placed in a horizontal link?
No more than one
True or False
The functions of a CP/HCP can be combined within the same zone box
True
How many links should an HCP serve?
A maximum of twelve
Should BAS signals share the same horizontal cable as telecommunications signals?
No, they should not share the same cable
Can BAS and telecom signals share the same backbone cable?
Yes, but should not be in the same binder in a multipair cable
Name three factors that are used to calculate BAS backbone distribution system requirements
- Number of pairs required for each device or branch
- Number of systems to be integrated with a minimum of one binder group for each system
- Distance limitations of the devices
What type of intelligence do most modern BAS use?
Distributed Intelligence
Hoe should balanced twisted pair cross connections for BAS services be indentified?
With a different colored conductor than voice or data
