Grain Systems PNEG-696 - Manual (Page 24)

Series 2000 Autoflow Operation
2 4
Top Dry Autoflow Theory Of Operation:
Control Panel Switch Status:
Control Power: “on”
Moisture Control Thermostat: “on”
Aeration Fan: “auto”
Load Auger: “auto”
Fan: “auto”
Heater: “auto”
Dump: “auto”
Dry & Hold: “off”
Emergency Stop Switch Status:
Autoflow Control Box Emergency
Stop: “pulled out”
Fill System Control Box Emergency
Stop: “pulled out”
Actuator Control Box 24v Switch:
“on”
Aeration Fan Bypass: “enabled”
When the Top Dry 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. When grain reaches the
Drying Chamber Low Level Rotary Switch the
Aeration Fan, and the Master Drying Fan will come
on, and the Fan Delay will start to count down.
When the Fan Delay reaches zero the Slave Drying
Fan will start, the Airswitch will close, and the Dry
AUTOFLOW THEORY
continued on page 26
Timer will start to count down. In single fan units the
Fan Delay will not count down and the Airswitch 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 Setpoint the fan/heater unit(s) will cycle to
Low-Fire. When the Plenum Temperature falls ten
degrees below the Cycle Setpoint 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 Setpoint is above the current grain
temperature the dryer will go into Temperature Hold.
When the grain temperature reaches the Grain Tem-
perature Setpoint 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.
After the Dump Cycle the unit returns to the
beginning of the Dry Cycle, the fill system(s) refill the
Drying Chamber and the process begins again. If the
Dry Timer reaches zero after the grain temperature
reaches the Grain Temperature Setpoint the unit does
not enter Temperature Hold. It goes right to the Dump
Cycle.
The unit continues with the same operation
until either no grain is present against the Wet Supply
Rotary Switch, or the Storage Chamber becomes full.