Grain Systems PNEG-526 - Manual (Page 12)

6
Tower Dryer Operations & Service
Dryer Control Panel Featuring The
Allen-Bradley PLC Control System
1. Full Color Graphical Display provides continu-
ous visual feedback on the current dryer status as well
as a convenient means of setting operating parameters
and options. Most set points and status screens are
accessed by simply touching an on-screen object.
2. Message Center displays current dryer condi-
tions and alarm messages with toubleshooting tips in
easy to read language.
3. Dryer View provides a quick visual indication of
primary dryer functions as well as easy access to
current burner and grain flow status screens.
4. Temperature/Moisture History Chart records
up to 32 hours of dryer temperature and/or moisture
data (with optional moisture control). The chart can be
easily "rewound" to view earlier drying conditions.
5. Control Power Switch energizes the control panel
and the PLC Control System. (NOTE: It takes
approximately 60 seconds to power up the Full Color
Graphical Display once the Control Power Switch
is turned on).
6. Outside Light Switch turns the dryer service light
on or off. On "AUTO", the light turns on when the
dryer is running and off when a shutdown occurs.
7. Load Switch controls the filling of the dryer. The
"ON" position initially fills the dryer. The "OFF"
position turns the conveyor off/shuts the slide gate.
The "AUTO" position enables automatic fill control
and the OUT OF GRAIN TIMER.
On dryers filled on demand with a conveyor
or slide gate:
In the "ON" or "AUTO" position the fill conveyor
turns on / slide gate opens when the dryer is low
on grain and off / closes when the dryer is full.
In the "AUTO" position only, the dryer will auto-
matically shut down when the dryer is low on grain
and the OUT OF GRAIN TIMER expires.
On choke filled dryers:
In the "AUTO" position only, the dryer will auto-
matically shut down when the dryer is low on grain
and the OUT OF GRAIN TIMER expires.
In the "ON" or "OFF" position the OUT OF
GRAIN TIMER IS DISABLED.
The LOAD switch is illuminated whenever the load
conveyor is running.
8. Low Grain Light flashes when the grain level is
low and the OUT OF GRAIN TIMER is running. The
LOW GRAIN light is on steady when the timer
expires.
9. Blowers Switch turns the blower(s) on or off. On
multifan dryers, the blowers start sequentially. The
lighted switch flashes during blower start-up. The
switch is illuminated when all of the blower airflow
switches close indicating that the blowers are operat-
ing correctly. After the closure of all of the airflow,
the dryer automatically goes through a 30 second
purge cycle.
10. Burner Switch turns the burner on or off. When
the switch is turned on, the burner pilot will automati-
cally light, after the purging cycle is completed. The
lighted burner switch will flash during the 15 second
pilot ignition time. The switch illuminates when the
pilot flame is sensed at the pilot. After the pilot flame
is established the Maxon shut-off valves in the fuel
train are energized. Motorized valves will automati-
cally open to provide gas to the main burner. Manual
valves must be opened manually to supply gas to the
main burner.
11. Unload Conveyor Switch turns the dry grain
unload conveyor on or off. The switch illuminates
when the conveyor is operating.
12. Metering Device Switch turns the metering
device on or off in forward or reverse. The device will
not run unless the unload conveyor is on. The switch
illuminates when the metering device is discharging
grain.
13. Dryer Power Start Button initiates automatic
operation of the dryer. When depressed, the dryer
begins the startup cycle and operates based on the
positions of the selector switches on the control panel.
To control the operation of individual components,
first depress the DRYER POWER START button,
then turn on the individual dryer components as
desired.
14. Dryer Power Stop Button manually stops all dryer
functions and automatic equipment in a controlled
shutdown sequence.
Important: In case of an automatic dryer shut-
down, the DRYER POWER STOP button must be
depressed before the dryer can be restarted.
DRYER CONTROL PANEL
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