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DDC Online DIRECT DIGITAL CONTROLS Getting Started An Overview of Direct Digita

DDC Online DIRECT DIGITAL CONTROLS Getting Started An Overview of Direct Digital Controls Purpose of this Guide: Due to the complexity and proprietary nature of DDC systems, it’s challenging to stay current with the designs, installations, operation and maintenance of DDC systems. DDC-Online.org was developed specifically to help building owners and consulting/specifying engineers with these issues. Getting Started is a tool to help professionals make more informed decisions and increase their knowledge about direct digital controls. Chapter 1: Introduction to Direct Digital Control Systems In this chapter: This chapter covers the basics of an Energy Management System – a fully functional control system. Read this chapter. Chapter 2: Control Response In this chapter: A review of five control responses and of the main benefits of DDC–improved effectiveness, improved operation efficiency and increased energy efficiency. Read this chapter. Chapter 3: Elements of a Direct Digital Control System In this chapter: Included in this section: data classification - type, flow and source: and characteristics of the software supporting DDC systems. Read this chapter. Input/Output Tutorial Purpose of this Guide: This portion of Getting Started provides descriptions of input and output devices written for someone new to the field or a seasoned engineer. Chapter 1: Input/Output (I/O) Basics 10/14/2010 DDC-Online ddc-online.org/Getting-Started.html 1/2 In this chapter: This section provides terms and definitions to help readers better understand material covered in next chapters. Read this chapter. Chapter 2: Input Devices and Sensors In this chapter: In the world of HVAC control, there is basically one type of device used to complete a digital input (DI) circuit. A switch, employed in various forms, is this device. The following sections outline common switching devices currently used by the industry. Read this chapter. Chapter 3: Output Devices In this chapter: There are numerous analog devices used in the HVAC controls world. Typically, analog output devices are used to provide modulating control of valves, dampers, electric motors through variable speed drives and a wide variety of other devices. The most common devices associated with analog outputs are sequencers, variable speed drives, silicon controlled rectifiers and actuators. The section also reviews the most common devices associated with digital outputs–relays, contactors, starters and two-position actuators. Read this chapter. Supported by the Iowa Energy Center. http://energy.iastate.edu/ Copyright Iowa Energy Center. 10/14/2010 DDC-Online ddc-online.org/Getting-Started.html 2/2 uploads/s3/ ddc-guide.pdf