Grain Systems PNEG-1743 - Manual (Page 40)

6. Moisture Control Options
40 PNEG-1743 Vision for Tower Dryers
This scheme also has a feature called “Auto-Centering”. If the controller is staying in HI the majority of
the time, it probably means the metering roll setpoint (MED) is set too low. To alleviate this problem,
the unload rate is continually averaged. Once an hour, the controller changes the metering roll setpoint
(MED) to the whatever the averaged value. So in the example above, if the controller stayed in HI for an
entire hour, it would change the metering roll setpoint to 70% and would now act according to the
table below.
NOTE: A “Max Grain Temp” safety is available for this scheme. By enabling this feature, the dryer will
shutdown and issue a warning if the grain temperature exceeds the “Max Grain Temp” value.
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 “Continuous Flow”.
3. From the “Drying Mode Selection” screen, select “M/C Setup” to access “Continuous Flow Setup”.
4. Select “Moisture” from the “Continuous Flow Control Schemes” group.
5. If desired, enable the “Max Grain Temp” safety.
6. Select “5 Speed” from the “Moisture Based Options” group.
7. If Auto-Centering is desired, select “Auto-Centering” from the “5 Speed Setup” group until the
“Enabled” box is checked.
8. Select “5 Speed Setup” from the “5 Speed Setup” group.
9. Press the “Select” button until “Positive Inner Limit” is circled in red.
10. Use the “Inc” and “Dec” buttons on the left to adjust the “Moisture” offset for the “Inner” set.
11. Use the “Inc” and “Dec” buttons on the right to adjust the “Metering Speed” offset of the “Inner” set.
12. Press the “Select” button until the “Positive Outer Limit” is circled in red.
13. Use the “Inc” and “Dec” buttons on the left to adjust the “Moisture” offset for the “Outer” set.
14. Use the “Inc” and “Dec” buttons on the right to adjust the “Metering Speed” offset of the “Outer” set.
15. Return to the “Default Operation Screen”.
16. Press the “Meter Roll Speed” adjustment knob to access the “Modifying Meter Roll Speed
Setpoints” screen.
17. Adjust the meter roll speed to the desired setpoint and press “Accept/Exit”.
18. Return to the “Default Operation Screen”.
19. Press the “M/C” button and enter a dry grain moisture setpoint.
20. Turn the “Unload” switch to the “AUTO” position.
21. Press the “Start” button on the control panel.
LO (Outer) M-LO (Inner) MED M-HI (Inner) HI (Outer)
Grain
Temperature
Less than or
equal to 14.5%
Between 14.6%
and 14.8%
Between 14.9%
and 15.1%
Between 15.2%
and 15.4%
Greater than or
equal to 15.5%
Unload Rate 50% 59% 62% 65% 74%