Grain Systems PNEG-1459 - Manual (Page 34)

34 PNEG-1459 L Series Operators
dry. This allows the moisture in the dryer to reach an even gradient top to bottom without having any highs or lows in it. It will
however, over dry some of the grain a little.
21. After the run time in step 20 begin to test the moisture content with a Moisture Tester you consider to be accurate. Test at
least 3 samples for accuracy. Having determined the average discharge moisture, you may now calibrate the incoming and
outgoing moisture sensors on the dryer. To do this you need to touch the SETUP button again and return to the Hardware
Parameter screen. Touch the M/C SETUP then touch the CALIBRATE SENSORS button. Follow the example below to adjust
the dryer to your moisture tester.
Example: Your moisture tester gives you an average moisture of 17% but the moisture sensor on the dryer is reading
18.3%. You would then calibrate the dryers moisture sensor (-1.3%), that would make the moisture sensor read 17%
the same as your moisture tester.
22. Once the moisture reading at the discharge is where you want it to be, turn the UNLOAD switch to AUTO.
23. Now that the UNLOAD AUGER switch is in the AUTO position the ADVANCED MOISTURE CONTROL is active. Now
touch the M/C button at the bottom of the Dryer Operation screen. When the Moisture Setpoint window appears set the
moisture setpoint to the output moisture you desire. Let the dryer run on these settings before trying to adjust moisture or meter
roll settings.
24. The dryer will run in MANUAL for the first 30 minutes after you turn the AUTO position. This will again make sure that
the grain is flowing through the dryer on an even basis. After the 30 minute period the Moisture Control will automatically
switch to advanced and take full control of the dryer. There is a count down screen in the upper right hand of the main display
that shows the time remaining before the advanced moisture control begins.
How the Advanced Moisture Control Works
The controller continuously monitors the moisture coming in and out of the dryer, and the column grain temperature at the
end of the drying section. However, the control action is mainly based on the dry sensor at the outlet of the dryer. If the
moisture coming out of the dryer is not right at the target, the controller will speed up or slow down the unload accordingly.
The wet sensor and the column grain temperature sensor are intended to detect moisture spikes coming into the dryer so that
the moisture controller can react ahead of time. For example, if the wet sensor detect a jump of moisture coming into the
dryer, the controller will start to slow down the unload speed right away. However, the controller does not act to the full scale
immediately. Instead, it slows down the dryer gradually so that the grain currently in the dryer would not get overdried.
The controller does not have enough information of the grain in the dryer in the first pass after the dryer is started. It controls the
dryer by using the manual speed setting as the starting point. In other words, the manual speed setting is most responsible for the
first pass of drying. Therefore, 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 have to be adjusted after the moisture control is
activated.
DRYER OPERATION - ADVANCED MOISTURE CONTROL