ASHRAE Workshop Control WilliamYick Part 2

8/13/2019 ASHRAE Workshop Control WilliamYick Part 2

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Chapter 9Analog Electronic Controls


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Control I/O

Analog Input Temperature 100 ohm, 1000 ohm

0-20mA, 4- 20mA, 0 10 Vdc,

Digital Input

On/OFF

Pulse


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Control Output

Analog Output 0-20mA, 4- 20mA, 0 10 Vdc,

Digital Output

On/OFF

Pulse


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Application-SpecificElectronic Controllers

Single-zone unit controllers

Control of VAV air handlers and

packaged units Control of multizone air handlers

Economizer enthalpy control VAV box controllers


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Types of Actuators

Electronic-electric Electronic-hydraulic

Electronic-pneumatic


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Hydraulic Actuator


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Single Zone Unit


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VAV System Control


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Chapter 10Digital Controls


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Basic DDC Loop


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Types of Input/Output Points

Analog inputs Binary (digital) inputs

Analog outputs Binary (digital) outputs


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Small Stand-Alone Panel


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System With DataGathering I/O Panels


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Distributed Intelligence


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Two-Tiered Network


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Types of System Software

Network communications software Panel operating systems

Application software Utility software

OMI software


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Programming Languages

Text-based languages Graphical programming

Ladder logic


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Text-Based Programming100 C*** ECONOMIZER OUTDOOR AIR DAMPER CONTROL105 C*** SHUT DAMPER WHEN FAN IS OFF110 IF (FANDPS.EQ.ON) THEN GOTO 510120 SET (0, OADMPR)130 GOTO 1000500 C*** SHUT OFF ECONOMIZER WHEN OAT >65510 DBSWIT (1, OATEMP, 63, 65, $LOC3)520 IF ($LOC3) THEN GOTO 610530 SET (20, OADMPR)540 GOTO 1000600 C*** OUTDOOR AIR DAMPER, N.C., 0 TO 100%610 LOOP (128, MATEMP, $LOC1, 55, 10, 30, 0, 1, 50.0, 0, 100, 0620 MAX (OADMPR, $LOC1, 20)1000 C*** END OF ECONOMIZER CONTROL


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Graphical Programming


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Ladder Logic Programming


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Question & Answer TemplateResponse

32. Is there heating control? (y/n) Yes

33. Type of heating control: (select a, b, c or d) C

a. Two-position

b. Modulating with face and bypass damperc. Modulating without face and bypass damper

d. Modulating with common heating and cooling

36. What is the heating output with the fan off? (___%) 0%37. What is the heating setpoint? (___F) 105F

38. Is there an auxiliary two-position output? (y/n) No


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Typical I/O Schedule


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DDC Control Schematic


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Sequence of Operation Occupied mode

Unoccupied mode Setback mode Fan alarm mode

Room temperature control Dry bulb economizer control Mixed air low limit control Fan alarm Filter alarm Freeze alarm


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Graphical Programming


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Advantages of DDC Increased accuracy

Flexibility Sophisticated control sequences Energy management Trending Alarm reporting

Remote monitoring and control Preventative maintenance Lower cost in many applications


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Agenda

Introduction

System Architecture

Communication Protocol

How to design a system

Q & A


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IntroductionBMSBuilding Management System

It is used for Monitoring & Control the followings:

1) HVAC System

2) Fire Services System3) Plumbing & Drainage System

4) Electrical System,

5) Lighting System


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Others Features

Energy Audit Software

Data Visualization

Totalization Time Scheduling

Event Program

Remote Access

Loading Profile


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BMS Role

Manage occupant comfortAlert operators of facility problems

Reduce energy usage

Protect facility assets


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Design Background & Intent

Central Control and Monitoring System

Centralize Monitoring and Control system to managea group of building systems

Provide management features for building systemsoperation and monitoring

Provide reporting features to summary the systems

status and alarm reporting

Reduce manpower or providing better service


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Benefits

Lowers EnergyCost

Lowers OperationsCost


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What it does

Connects to major M&E equipment in the building.

Automatic operation for routine and repetitive

functions.Reduced operator training time through on screen

instruction and supporting graphic display.

Better management of energy cost through energymanagement programs.

Better management of facility through historical

records.Improved operation through software and hardware

integration of different subsystems such as fire alarm

and access control.


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What Customer Wants BMS to Do

Easy to use

Easy to install

Able to control the building with minimum manpowerand energy without risk of customers comfort.

Open systems and vendor independence

Web interface Dont make me buy software for each user

Able to access remotely

Keep me safe from hackers

Current technology


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System Structure

The Metasys DistributedThe Metasys Distributed

User InterfaceUser Interface

TCP/IPTCP/IP

N2N2

BACnetBACnetLONLON

AutomationAutomation

EnginesEngines N2N2

BACnetBACnetLONLON


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Larger System Structure

Alarm

Printer

NAE NAE

PC

Browser

PC

Browser

ADS

Hub/

SwitchRouter

Router


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Network Controller Building Automation Functions

Alarm detection/management Scheduling

Trends Report

Totalization

Optimal start/ stop

Custom control applications

Event program


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Network Controller

BACnet IP (across the network)

BACnet MS/TP (field bus standard) Variety of models

Java Virtual Machine

Embedded Microsoft OS IP http, soap, snmp, smtp, sntp

LON (field bus compatibility)

Web Services


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BACnet Controllers Field Equipment Controllers

Terminal Equipment Controllers

Input/Output Modules FEC and IOM standard panels

VAV Modular Assembly

Controller Configuration Tool

Wireless commissioning tool

Network sensors


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Life Safety & Smoke

Control

Smoke Control

Engine

TCP/IP

IFC w/

BACnet

option

Server

Functional

Integration

Functional

Integration

SecondarySecondary

reportingreporting

Long termLong term

eventeventstoragestorage

S t C t l S h ti


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System Control Schematic


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S t C t l S h ti


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P i t S h d l


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Point Schedule


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Configuration ProcessBinary Inputs

Status

Trip Alarm

Binary OutputsStart / Stop

Open / Close

Analog InputsTemperature

Pressure

Analog OutputsValve Position

Damper Position

DDC

ControllerPanel

Wiring from equipment control panels,sensors and actuators are connect to

DDC Controllers.

DDC Controllers provide local stand-alonecontrol to maintain environment


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Configuration ProcessBinary Inputs

Status

Trip Alarm


Open / Close


Pressure


Damper Position

DDC

ControllerPanel

Controllers are networked

with subsystems to NAE.

NAE provides supervisorycontrol and management

features.

TEC

Computerised

Subsystems

Chiller Panel

Fire Alarm

Network

Controller

Configuration Process


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Configuration Process

Binary InputsStatus

Trip Alarm


Open / Close


Pressure


Damper Position

DDC

ControllerPanel

NAEs and PCs

are on a LAN.

PCs provideGUI and data

archiving.

TEC

Computerised

Subsystems

Chiller Panel

Fire Alarm

Network

Controller

NetworkController


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Questions?Q & A

ASHRAE Workshop Control WilliamYick Part 2

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