Watlow PPC-2000 Manual de usuario Pagina 148

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Figure 3.x Heat and Cool Scaling Parameters
Cool Scale Lo
Set Point
Heat Scale Lo
Set Point - Heat Prop Band
Heat Scale Hi
Set Point + Cool Prop Band
Cool Scale Hi
Process Variable (Units)
Out
p
ut
(
%
)
Heat
Cool
As the process
variable increases
toward set point,
the heat output
trends toward the
Heat Scale Lo
value
As the process
variable increases
away from set
point, the cool
output trends
toward the Cool
Scale Hi value
As the process
variable decreases
toward set point,
the cool output
trends toward the
Cool Scale Lo
value
As the process
variable decreases
away from set
point, the heat
output trends
toward the Heat
Scale Hi value
Time
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