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Large Dehumidifying Dryers Controls 28
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.
Indicator Name Description
ALARM1 ALARM 1 LED
Lights in the Operation Indicator Section when
the output function assigned to auxiliary output
1 turns on. The ALARM1 indicator lights when
the process temperature falls below the set point
temperature by more than the alarm deviation
value. Advisory alarm does not interrupt operation
of the dryer.
Indicator Name Description
ALARM2 ALARM 2 LED
Lights in the Operation Indicator Section when
the output function assigned to auxiliary output
1 turns on. The ALARM2 indicator lights when
the process temperature exceeds the set point
temperature by more than the alarm deviation
value. Alarm output de-energizes the heaters.
Heaters re-energize when the temperature falls
within the acceptable range.