Line C Circuit Components Flashcards
What is the standard voltage used for industrial control circuitry?
120 volts
Why are separate ignition transformers used for industrial burner systems?
To generate a big and hot enough spark to ensure the fuel ignites quickly and efficiently
Are limit circuits wired in parallel or series?
In series
List four specific conditions that a limit in a circuit control can control for?
Temperature, Pressure, Liquid Level and Liquid Flow
What are the two types of reset for limit switches?
Manual or Automatic
Referring to Figure 1, what type of limit is represented?
A High pressure limit switch
What does an operating control do and what are the two most common limits associated with them?
An operating control turns the burner system on and off based on temperature or pressure.
Referring to Figure 2, what is this the symbol for in a limit circuit?
Pressure switch
Referring to Figure 3, what is this the symbol for in a limit circuit?
Temperature switch
Referring to Figure 4, what is this the symbol for in a limit circuit?
Float switch
Referring to Figure 5, what is this the symbol for in a limit circuit?
Flow switch
What is one purpose of a permissive circuit?
To ensure two incompatible events don’t occur at the same time.
Define an interlock:
An interlock is a feature that makes the state of two mechanisms or functions mutually dependent (one can’t work without the other)
A DFMAH shall be ______ in such a way as to prevent its operation unless the exhaust system is functioning.
Interlocked
What must be proved when using automatically operated louvres for the inlet and discharge of a DFMA?
They must be proved fully open.
