Grain Systems PNEG-1717 - Manual (Page 43)

8. Vision/Dri-Tek Dryer Operation
PNEG-1717 CE Approved GSI/FFI Portable Dryer Manual 43
Figure 8K
10. Once the discharged grain has reached the desired moisture content, turn the Unload switch
to AUTO.
11. Moisture control (5 Speed) is now active.
12. If you press the meter roll knob, you will now notice that there is one meter roll speed to adjust.
How the Moisture Control Works
The controller continuously monitors the moisture coming in and out of the dryer, as well as the column
grain temperature at the end of the drying section. However, the control action is based on the sensor at
the outlet of the dryer. If the moisture coming out of the dryer is not at the target, the controller will speed
up or slow down the unload accordingly. How the meter rolls react depends on the set point and the actual
moisture coming out of the dryer. As long as the outgoing moisture is three-tenths above or below the set
point, the meter rolls run on the middle speed. Once the moisture begins to drift from the set point by
over three-tenths either above or below the set point, the speed will automatically switch between middle
and low, or middle and high speed. This is a very fast response and will bring grain back towards the
set point quickly.
The manual speed setting is responsible for the first pass of drying because the controller does not yet
have enough information about the grain in the dryer. Set the manual unloading speed as close as it
should be for the grain currently in the dryer before switching to moisture control mode. The manual
speed setting does not need to be adjusted after the moisture control is activated.
Calibrate sensors by touching the arrow buttons.