Theory of operation – Grain Systems PNEG-728 User Manual
Page 34
Autoflow Operation
34
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 on the Moisture Control Thermostat 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.
If the Wet Storage Tank becomes empty
while the fill systems are running, the Unload
Delay starts to count down. When the Unload
Delay reaches zero the fill system(s) shut off
along with the dryer and a Wet Supply Hopper
Empty error is displayed on the Dryer Control
Panel screen. If there is grain against the Drying
Chamber Low Level Rotary Switch the unit can be
restarted by pressing the start switch. When the
start switch is pressed the screen on the Dryer
Control Panel will read Press Enter to Dry
Remaining Grain. If the enter button is pushed
the dryer will restart without running the fill
system(s). The dryer will remain running until the
completion of the next Dump Cycle, after which an
out of Grain error is displayed on the Dryer
Control Panel and the dryer stops.
If the Storage Chamber High-Limit Rotary
Switch becomes covered with grain during the
Dump Cycle the dryer will continue through the
Dump Cycle and will continue to the next Dry
Cycle. When the Dry Cycle is complete the unit
will not continue to the Dump Cycle. A Storage
Chamber Full error will be displayed on the
screen and the dryer will stop. The unit will not
dump automatically until grain has been removed
from the Storage Chamber.
If the dryer stops for any reason the Aera-
tion Fan Bypass switch is placed in the
continuos position. The Aeration Fan Bypass
switch is located in the side of the Fill System
Control Box. If the Aeration Fan Bypass switch is
placed in the automatic position the Aeration
Fan stops whenever the dryer stops.
Items In Italics Are Defined In the
Dryer Terminology Section.
THEORY OF OPERATION
Top Dry Autobatch
Theory of Operation
Control Panel Switches Status:
Control Power:
On
24v Power:
On
Moisture Control Thermostat:
On
Aeration Fan:
Auto
Load Auger:
Auto
Fan:
Auto
Heater:
Auto
Dump:
Auto
Dry & Hold:
Off
Emergency Stop Switches Status
Autoflow Control Box Emergency Stop: pulled out
Fill System Control Box Emergency Stop: pulled out
Actuator Control Box Emergency Stop: pulled out
Aeration Fan Bypass: Continuos
continued on page 35