Covers definition of control loop terms and characteristics. The online course includes specific examples of operation and maintenance of control loops of many kinds. Discusses proportional, integral, and derivative modes in detail. Describes advanced control methods by means of four strategies with specific examples. Examines the effects of loop dynamics on system stability. This course has no prerequisites. How Control Loops Operate is available in online maintenance training and course manual formats.
TPC Training is authorized by IACET to offer 0.5 CEUs for this program.
Review a full course list for Instrumentation & Control Systems Technician
Definitions; Process sensors; Sensor characteristics; Controllers; Recorders; Signal conditioners; Final control elements
Two-position and floating control; Proportional, integral, derivative, and PID mode; Supervisory control; DDC; DCS
Cascade and ratio control system; Feedforward control; Ratio control in a secondary loop; Multivariable control systems
Effects of process time lag; Dead time compensation; System stability; Transient response; Gain; Phase shift
– Describe two kinds of process time lags and give an example of each.
– Discuss the effects of capacitance and resistance on loop dynamics.
– State the three main objectives of a well-designed process control system.
– Describe how PI, PD, and PID controllers are adjusted to achieve optimum response.
– Discuss the effects of system gain and phase shift on system stability.
Explosion-proof enclosures; Intrinsically safe instrument systems; Fail-safe mechanisms; Hard and soft constraints; Alarms
– Discuss the classification of hazardous locations as identified in the NEC Handbook.
– Define volatility and flash point, and explain the purpose of a purged enclosure.
– Describe two kinds of explosion-proof enclosures.
– Discuss ways of making a system intrinsically safe.
– Describe examples of fail-safe mechanisms, and differentiate between hard and soft constraints.
– Compare latching and nonlatching alarm systems, and explain the function of annunciators.
– Discuss the purpose and operation of interlocked and sequential control.
Symbol recognition; Piping and instrument drawing; Location and installation drawing; Loop and wiring diagram
– Recognize standard symbols used in process control diagrams.
– Describe a process control system through the use of instrument symbols.
– Recognize and use four kinds of process control diagrams.
– Analyze a process control drawing for the elements, signal flow, and process flow.
Sequence of operation; Flowchart; Switches; Relays; Electrical elementary diagram; Pump system schematic; PLC diagram; Symbols
– Convert sequence-of-operation text to a flowchart.
– Read electrical and electronic control diagrams and drawings.
– Recognize symbols used on electrical and electronic diagrams, including those for PLCs and SAMA logic.
– Convert electrical diagrams to PLC diagrams.
– Discuss the role of computers in process control.