The
PROCESS RETURN AIR TEMPERATURE
displays the air temperature as it leaves
the drying hopper. If this temperature is above 150°F, an aftercooler is required.
By pressing the
DISABLE
or
ENABLE
the operator disable or enable this feature of the
dryer.
This feature is used to prevent the over drying of the plastic resin in the drying hopper.
At this point the operator has the choice of pressing
MAIN MENU
,
DRYER MENU
, or
MORE
to access the screen 2 of 2 of the
OVERDY PROTECTION
for adjusting values.
SET BACK VALUES;
The
SETPOINT
is the secondary drying temperature set point. This is the temperature at
which the drying temperature will be reduced to after a certain delay time and when the
return air temperature has exceeded its set point..
The
TEMP
is the set point for the return air temperature of the drying hopper. When the
return air temperature exceeds this value, after a certain delay time, the process temperature
will be reduced to its secondary value (SETPOINT) to eliminate over drying of the plastic
material.
The
DELAY
is the time which will take for the dryer to switch the drying temperature set
point from primary drying temperature to secondary drying temperature or back to the
primary drying temperature set point.
SET UP TEMP;
The
SETUP TEMP
is the secondary temperature setting for the return air temperature. When
the return air temperature of the drying is lower than this set point, after a certain delay time,
the process temperature set point will switch back to the primary drying temperature set
point.
Once the parameters have been set for the drying process, the operator can return to the
DRYER MENU, MAIN MENU,
or
BACK
to the screen 1 of 2 of the
OVERDRY
PROTECTION.
Setting Values
By pressing and holding the numbers in the
SET BACK DELAY
button, the following
screen will be displayed:
Portable Drying/Conveying Systems
Chapter 4: Operation
27 of 63
