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|  DOE-STD-1162-2003
pneumatic (3-15 pounds)
electrical (4-20 milliamps)
electrical (1-5 Volts)
13.
Instrumentation and control personnel shall demonstrate a working level knowledge of
process control systems.
Supporting Knowledge and/or Skills
a.
Define and discuss the following process control terms:
Control system
Control system input
Control system output
Open loop system
Closed loop system
Feedback
Controlled variable
Manipulated variable
b.
Given a diagram of a process control system, describe its operation including the function
of the following basic components:
Controller
Controlled device
Feedback elements and signal
Setpoint/reference signal
Actuating signal
Manipulated variable
c.
Discuss the factors in a process control system that contribute to process control time
lags.
d.
Discuss stability in a process control system. Include in the discussion an explanation of
converging and diverging oscillations and hunting.
e.
Discuss the following process control system characteristics and terms:
Reset control
Rate control
Proportional band
Offset
Span
Deviation
Cascading
f.
Describe the operation of the following types of automatic control systems:
Two-position control system
Proportional control system
Integral control system
15
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