Plant Control System Training
565-01 Distributed Control System Fundamentals
When you complete this lesson, you will be able to describe the design and function of a typical distributed control system (DCS).
- Describe the functions of a typical distributed control system (DCS)
- List and briefly describe the main components or elements of a DCS
- Explain the use of a remote control panel in the DCS
- Discuss communications mediums available for use in DCS; list advantages and disadvantages of each choice
- Describe the purpose of a central control facility (control room) associated with a DCS
- Describe the functions of the human machine interface (HMI)
- Discuss the reasons for different levels of authority on various HMI stations
- Identify the functions of control, interface, and database software associated with DCS
565-02 Distributed Control System Components
When you complete this lesson, you will be able to list the components associated with a common distributed control system (DCS) and describe their functions.
- List and briefly describe plant instrumentation used to collect system parameter and equipment data to be used in a DCS
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Describe the general design and function of the following DCS components:
- Instrumentation
- Transmitters and input/output modules
- Processors
- Multiplexers
- Electrical/computer buses
- Human-machine interface
- Control devices/actuators
- Discuss the flow of information through the DCS and describe how that information is used to monitor and control power plant systems, parameters, and equipment
565-03 Using Distributed Control System Diagrams
When you complete this lesson, you will be able to describe the basic symbols and parts of a logic diagram. You will also be able to explain how to use a DCS logic diagram as a troubleshooting tool.
- Identify basic logic symbols used in logic diagrams
- List the parts of a drawing title block
- Explain the purpose of a drawing legend
- Discuss permissives and interlocks associated with control systems
- Describe how a control loop maintains a parameter at its control setpoint
- Discuss the use of trip setpoints
- Describe how the feedback function in a control loop helps keep processes stable
- Describe trim and bias control logic features
- Discuss general troubleshooting steps and techniques
565-04 Power Plant Unit Control
When you complete this lesson, you will be able to describe the basic design and function of a boiler-following instrumentation and control system.
- Discuss the basic operation of a boiler-following distributive control system (DCS)
- Explain how changing power plant load affects steam temperature, pressure, and flow
- Describe how the DCS maintains parameters at their designed values when unit load changes
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Discuss the relationship between the following:
- Fuel flow and associated unit parameters
- Fuel flow, furnace draft, air flow, and excess oxygen
- Feedwater flow, steam flow, unit load, and boiler drum level
- Identify operator responsibilities in controlling key operating parameters, systems, and equipment during normal operation