AEC AP Series Large Dehumidifying Dryer - Manual (Page 41)

Large Dehumidifying Dryers Controls 40
4-5 Drying Hopper Setup
Use the drying hopper setup display to change the following drying hopper specific
parameters.
• Start or stop the drying hoppers Process supply air temperature control loop auto-
tune.
• Select whether a drying hopper low level alarm will
o Never alarm (Disabled)
o Only arm when the dryer is running (Dryer)
• Select whether the drying hopper is running at
o FULL capacity – low level probe 1 is used for low level alarm.
o ½ capacity – low level probe 2 is used for low level alarm.
• Set an offset value to the dryers supply and return air temperature readings.
• Set the high and low Process supply air temperature deviation alarm values.
• Change the name of the drying hopper.
• Access the Material Miser and air balance setup screen.
Use the “Material Miser and Air Balance Setup Screen” display to control the various
available combinations of Material Miser action and optional air damper control.
Material Miser
o Temperature Activated
ƒ Material Miser mode is active when the difference between the supply and return
temperature has been less than the “Set Back Temperature” value for the “Set
back Delay” time.
• Set Back Only
o When activated, Material Miser will automatically change the
drying hoppers Process supply air temperature set point to the
value set in “Set Back Setpoint.”
• Air damper only
o When activated, Material Miser will automatically close the
optional air damper valve.
• Set Back with Air Damper
o In addition to temperature setback, close the optional air damper
valve.
o Convey activated
ƒ Material Miser mode is active when the drying hopper senses that it has not
received new material within the “Demand Watchdog” time.
• Set Back Only
o When activated, Material Miser will automatically change the
drying hoppers Process supply air temperature set point to the
value set in “Set Back Setpoint.”
• Air damper only
o When activated, Material Miser will automatically close the
optional air damper valve.
• Set Back with Air Damper