Grain Systems PNEG-1935 - Manual (Page 45)

6. Moisture Control Options
PNEG-1935 Vision Hybrid for Portable Dryers 45
Staged Batch Drying
Stage batch drying is comprised of three (3) phases: Drying, Cooling and Unloading.
1. Drying Phase - All fans and burners are on during this phase. Unload is OFF.
2. Cooling Phase - All fans are on during this phase. Any burner in the “AUTO” position is turned OFF
during this phase. If the burner is in the “ON” position, it will remain on for this period. The unload
is OFF.
3. Unloading Phase - All fans and burners in the “AUTO” position are turned OFF during this phase.
Any fan or burner in the “ON” position will remain on for this period. The unload is ON.
A batch is defined as some portion of the drying basket’s capacity. A full batch refers to 100% of the
basket’s capacity, one-half batch refers to 50%, etc. The different batch sizes are determined by the
unloading phase of the cycle. If it takes 20 minutes for the dryer to fully unload and the “Unload” timer is
set to 10 minutes, this would be considered a 1/2-1/2 batch (50/50).
The drying phase is considered the variable phase of the three. The cooling and unloading are timers set
by the user and usually do not change. The moisture control portion only manipulates the length of the
drying phase. There are three (3) control parameters that are used to establish the length of the drying
period: Time, Temperature and Moisture.
If the dryer is an 1100 series, while in one of the Time or Temperature schemes, the user can choose
between single or dual plenums. With “Single Plenum” selected, the plenum setpoint remains the same for
the entire drying phase. If “Dual Plenum” is chosen, the plenum setpoint will be at one value for an amount
of time and change to another setpoint for the remainder of the drying phase. When the switch between
plenum setpoints occurs depends on which control parameter is being used (Time or Temperature).
Time Controlled Scheme
When to Use:
This scheme is used when the user would like to expose the grain to heat for no longer than a given
amount of time.
Batch Sizes
Control Parameter
Drying Mode Stage Batch
Time Temperature
Time and
Temperature
Moisture
Full 1/3-2/3 1/2-1/2