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PNEG-696
TopDry Series 2000 Autoflow
9. Autoflow Theory
TopDry Autoflow Theory of Operation
Control Panel Switch Status
1. Control Power: “ON”
2. Moisture Control Thermostat: “ON”
3. Aeration Fan: “AUTO”
4. Load Auger: “AUTO”
5. Fan: “AUTO”
6. Heater: “AUTO”
7. Dump: “AUTO”
8. Dry and Hold: “OFF”
Emergency Stop Switch Status
1. Autoflow Control Box Emergency Stop: “PULLED OUT”
2. Fill System Control Box Emergency Stop: “PULLED OUT”
3. Actuator Control Box 24V Switch: “ON”
Aeration Fan Bypass: “Enabled”
When the TopDry is in a ready state, that is with no grain in the drying chamber and wet grain in the wet
storage tank, Fill System #1 and Fill System #2 will start to fill the drying chamber with wet grain when the
Start switch is pressed on the Dryer Control Panel. In single fill system units only fill system #1 will start.
and the fan delay will start to count down. When the fan delay reaches zero, the slave drying fan will start,
The Aeration Fan and the Master Drying Fan will come ON and the Air switch will close and the dry timer
will start to count down. In single fan units, the fan delay will not count down and the Air switch will close
after the master drying fan starts. After a twenty second purge delay the fan/heater unit(s) will ignite. When
the plenum temperature reaches the cycle set point the fan/heater unit(s) will cycle to low-fire. When the
plenum temperature falls 10° below the cycle set point the fan/heater unit(s) will cycle back to high-fire.
The fan/heater units will continue to cycle throughout the drying process.
When grain reaches the Chamber High Level Rotary switch the fill 2 delay will begin to count down.
When the fill 2 delay reaches zero fill system #2 will shut off and the fill 1 delay will begin to count down.
When the fill 1 delay reaches zero fill system #1 will shut off.
If the Chamber High Level Rotary switch becomes exposed due to shrinkage of grain in the drying
chamber, the fill system(s) will start and refill the drying chamber. When grain reaches the Chamber
High Level Rotary switch the fill system(s) will shut off after the delays.
When the dry timer reaches zero and the grain temperature set point is above the current grain
temperature the dryer will go into temperature hold. When the grain temperature reaches the grain
temperature set point the unit will continue to the dump cycle. In the dump cycle the linear actuator
in the actuator control box extends, the dump chutes lower and grain is dumped from the drying
chamber into the storage chamber. Immediately after the dump chutes open the dump timer begins to
count down. When the dump timer reaches zero, the dump chutes raise and grain stops dumping from the
drying chamber into the storage chamber. During the dump cycle 1/3 of the grain is dumped into the
storage chamber.