Grain Systems PNEG-1851 - Manual (Page 50)

Chapter 5: The Drying Modes
Figure 5-9 Temperature control scheme in the dry and cool operation
NOTE: In full-heat operation, the cooling phase is simply bypassed. As a result, the unloading phase
starts immediately following the drying phase, allowing uncooled, hot grain to be discharged from
the dryer.
The Dual-Setpoint Temperature Control Scheme
In the dual-setpoint control scheme, you enter the following parameters:
• The grain setpoint 1
• The grain setpoint 2
• The temperature setpoint of each plenum for the first part of the drying phase (plenum setpoints 1)
• The temperature setpoint of each plenum for the last part of the drying phase (plenum setpoints 2)
As shown in the following figure, the drying phase starts when theload auger fill switch is activated. In addi-
tion, all fans and heaters turn on so that the plenums can reach plenum setpoint 1. When the grain temper-
ature reaches grain setpoint 1, the second part of the drying phase begins and the heat intensity is
reduced. This reduction makes the drying process less aggressive, thus resulting in better quality grain.
The drying phase ends when the grain temperature reaches grain setpoint 2. A cooling phase immediately
follows, and the dry and cool grain is then discharged from the dryer during the unloading phase.
50 PNEG-1851 Vision N2