Grain Systems PNEG-1935 - Manual (Page 48)

6. Moisture Control Options
48 PNEG-1935 Vision Hybrid for Portable Dryers
Setup Procedure
1. Press the “Stop” button on the control panel if the dryer is running.
2. From the “Setup” screen, select “Drying Mode”, then “Staged Batch”.
3. From the “Drying Mode Selection” screen, select “M/C Setup” to access “Staged Batch Setup”.
4. Select “Time” and “Temp” from the “Staged Batch Drying Criteria”. Make sure both the “Time” and
“Temperature” check boxes are selected.
5. If desired, enable the “Max Time” and “Max Grain Temp” safety.
6. Select “Single” or “Dual” plenum.
7. Return to the “Default Operation Screen”.
8. Set the Dry Timer(s), Cool Timer and Unload Timer to the desired time.
9. Press the “Temp” button.
10. Set the plenum(s) and grain temperature setpoint(s) to the preferred temperature(s).
11. Return to the “Default Operation Screen”.
12. Position “Unload” switch in the “AUTO” position.
13. Press the “Start” button on the control panel.
Moisture Controlled Scheme
When to Use:
This scheme is used when the user would like the controller to vary the length of the drying phase.
How it Works:
The user should stabilize the dryer with the Unload switch in the “MANUAL” position. It is imperative that the
dryer is outputting the desired moisture content grain before switching the unload to the “AUTO” position.
Once the user is ready to start the Stage Batch Moisture scheme, a small calculation needs to be done.
The user will have to estimate an initial Minutes Per Point (MPP) for the grain that is to be dried. For
demonstration purposes, we will set this value to five (5), which is normally a good starting point for most
grains. The calculation is used to set the Dry Time for the first batch. After the first batch, the controller
uses the initial Dry Timer as a starting place and it will adjust from there to acquire the best MPP.
Below is the equation that is used to calculate the Dry Time.
1. Full batch: N = 1
2. 1/2 - 1/2: N = 2
3. 2/3 - 1/3: N = 3
ΔMC = Incoming moisture (grain entering the dryer) minus the moisture setpoint.
MPP = The initial MPP guess.
N = The number of unloads it takes for the grain to fully pass through the dryer.
Dry Time =
(ΔMC * MPP) - Cool Time - Unload Time
N