Electronic Controllers (AEM05)

Learn about the routine maintenance requirements and calibration procedures for electronic controllers.

Prerequisites

This lesson is designed for participants familiar with process control and control loops.

Description

This lesson presents routine maintenance requirements and calibration procedures for electronic controllers. The lesson shows how controller circuitry works and how to adjust and calibrate each of its component sections: the display, the alarm circuitry, and the control circuitry.

Objectives

Identify the features and functions of controllers. Describe and compare pneumatic and electronic controllers. Identify the signal path through a control circuit. Describe the function of resistors, comparators, proportional band amplifiers, integral amplifiers, differentiating amplifiers, summing amplifiers, and the transducer Visually identify indicators on electronic controllers as well as set point, process, output, and alarms. Visually identify controls on electronic controllers as well as set point control, auto- manual selector switch, and manual/valve control. Identify appropriate equipment and demonstrate procedures for calibrating and troubleshooting display indicators. Identify appropriate test points and demonstrate procedures for calibrating and troubleshooting alarm indicators. Identify appropriate equipment for calibrating control circuits and calibrate proportional, integral, and derivative zero on the control circuit. Identify appropriate equipment for troubleshooting control circuits.