CEMP-E
TI 810-11
30 November 1998
Bias:
A single-loop digital controller function which
maintains a fixed difference in engineering
units between controller setpoint and the
remote setpoint signal to the controller in
engineering units.
BLR:
Boiler
C:
Common
A phenomenon that results in valve damage
from too great a pressure drop through a
valve.
CB:
Circuit Breaker
CC:
Cooling Coil
CDHR:
Condenser, Hydronic Return
CDHS:
Condenser, Hydronic Supply
CFM:
Cubic Feet Per Minute
CH:
Chiller
CLK:
Time Clock
Closed Loop System:
Control system configuration that allows
system feedback.
COND:
Condenser
Controlled Device:
The instrument that receives the controller's
output signal and regulates the controlled
process.
Controlled Variable:
The temperature, humidity, or pressure value
to whose variations the controller responds.
Controlled variable is also called process
variable.
Controller:
The instrument that measures the controlled
variable and responds by producing an
output signal that holds the controlled
variable within preset limits.
Controller Feedback:
The change in the controller's output in
response to a measured change in the
controlled variable that is transmitted back to
the controller's input.
Control Point:
The actual value at which a controller is
holding a process variable.
Glossary-2
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