Grain Systems PNEG-743 - Manual (Page 5)

6
Series 2000 Top Dry Heater Control
OPERATING PROCEDURE
There are three possible configuration modes for
the Top Dry.
1. Stand alone heater control. Master control is
located on fan/heater and no other control is neces-
sary. Running fan/heater in this mode requires
climbing up to fan/heater to start unit and adjust con-
trols.
2. Econo control center. In this case the control is
located up on the fan/heater and has been pre-pro-
grammed. Power is then applied from a switch be-
low. The start switch is a momentary switch that is
attached to J7-7 connector. The dryer is started by
depressing that momentary switch. Note, that in this
mode, the display is remote, therefore error condi-
tions will shut the dryer down but cannot be viewed
unless you climb up and look at the display.
Limit switches are checked upon power up. The
control checks all the limit switches. If a limit switch
has become open circuit the control displays which
limit is open circuit. The control will not operate
with a limit switch error. The fan will not turn on
with an error condition. There is no way to bypass
an error condition. It must be fixed (see errors page
22). The air switch is also checked on power up.
The air switch should indicate no airflow. This is
neces-sary to check the function of the air-
Power Up
Normal Operating Displays
Heater Not Running
The main display shows either dry time (lower left
cursor), cool down time (lower 2nd from left cur-
sor), plenum (lower 2nd from right cursor) or grain
temperature (lower right cursor). The "mode select"
switch (fan bypass) is used to select the mode to be
The control panel of the Top Dry heater unit.
Setup And Configuration
3. Manual control center. In this case the master
control is up on top where all the sensors and limits
are attached. The remote display below is attached
via a serial 2 wire link. The remote display is used
to program the master, view errors and start the
dryer. In essence, the remote display is just a slave
extension of the master.
flow switch. The air switch error on power up can-
not be bypassed since, in the Top Dry system, the
fan is controlled by the heater control.
If multiple heaters are tied together, and the
master detects that the slaves fan is on (the air switch
stuck?), the master will lock up displaying "SLA
ERROR".