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Dehumidifying Dryers Chapter 4: Operation 26 of 59
Process Air Temperature Controller
Our dryers use a microprocessor-based PID temperature controller for maintaining process air
temperature. The controller is a modular, self-contained unit you can remove from the
mounting housing. All parameters except for the process air set point are factory set and
adjusted; normally, no field adjustment to the internal controls is necessary.
Figure 5: Typical Process Air Temperature Controller
Identifying Process Air Temperature Controller LED Indicators
Indicator Name Description
PV
8.8.8.8
Process Value
Numeric LED
During normal operation, the process value (PV)
numeric LED indicator displays the process
temperature at the To Process thermocouple. It
also lists parameters during setup and error
messages if any errors occur.
SV
8.8.8.8
Set Value
Numeric LED
During normal operation, the set value (SV)
numeric LED indicator displays the process set
point temperature selected for the dryer. The dryer
then maintains this set point temperature. This
LED indicator also displays parameter and pre-set
function values during configuration setup.
OUT1
Out 1 LED Lit when Control Output 1 is on. The Out1
indicator lights when the controller signals the
process heaters to be energized.
OUT2
Out 2 LED Lit when Control Output 2 is on. Not used in
this application.
AT
AT LED Flashes during auto-tuning in process value (PV)
screen.
P
V
SV