6.1 Introduction to Electrically Controlled Systems

List basic applications of electrically controlled systems.


Give examples of inputs, outputs, and internal components in an electrically controlled system


Give examples of potential faults in an electrically controlled system


Differentiate between control/pilot signal and power/primary signals


Describe the purpose of separating pilot and primary


Describe the purpose of a control transformer


Describe the similarities and differences between a contactor and a solenoid operated valve


Describe ladder logic diagrams and indicate the advantages of ladder logic


List the general rules of ladder logic


Differentiate between switches and sensors


Describe the purpose of a transducer


Differentiate between manual and mechanical/automatic switches and give examples of each


Describe span/hysteresis/override


Differentiate between hard wired relay based ladder logic and PLCs and discuss the advantages of PLCs


Describe a control relay


Describe the AND function


Describe the OR function


Describe the operation of this electrically controlled system.


Discuss general troubleshooting procedures for electrically controlled systems.

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