Grain Systems PNEG-582 - Manual (Page 19)

19
SERIES 2000 HEATER OPERATING PROCEDURE
PROGRAMMING SET
POINTS
multiple heaters may be done at any
heater control console. The infor-
mation programmed is automatically
transmitted to all other heaters when
the programming is complete.
Hi Limit Set Point--The upper
left cursor is flashing indicating the
mode. If the plenum temperature
increases above this point, the flame
is shut off--"OFF-CYCLE" is dis-
played on screen.
Cycle Set Point--The upper 2nd
from left cursor is flashing indicat-
ing the mode. If the dryer is not a
hi-lo dryer, this function is
skipped. If the plenum tempera-
ture increases above this point, the
flame reduces to "LO-FLAME".
Humidity Set Point--The upper
2nd from right cursor is flashing in-
dicating the mode. If the humidity is
Depressing the "PROGRAM" switch
(lower left) causes the display to en-
ter the program mode. Each item
below is programmed by using the
up and down arrow switches. Hold-
ing down these up and down arrow
switches for about 2 seconds will
cause the numbers to increase/de-
crease rapidly until the switch is re-
leased. When finished program-
ming an item, depressing the "PRO-
GRAM" switch again will cause the
new setting to be entered into
memory, and the display will ad-
vance to the next function to be pro-
grammed.
Programming may be done at
anytime (unless an error condi-
tion exists) even while the dryer
is in operation.
Programming a system with
The limits are continuously
checked during the drying operation.
A limit switch open or any other er-
ror condition will cause the dryer to
shut down, and the fan will be shut-
down. If a limit opens, or an er-
ror condition occurs during dry-
ing, the control will lockup in the
error display mode. Power must
be shut off and back on to the
control to clear the error condi-
tion--even if the error or limit that
caused the shutdown has been cor-
rected. This is to keep the display
locked up with the condition that
caused the error, allowing the opera-
tor time to determine what caused the
shutdown.
above this point the dryer operates
normally--flame on and off at the
high limit and cycle set points. If the
humidity is below this point the dryer
goes into the "OFF-CYCLE" mode.
Note: At this time a true humidity
sensor has not been introduced.
To use this option, set the humid-
ity setting to 50% and use a hu-
midistat switch. When the humid-
ity is high the switch is closed, indi-
cating high humidity. At this setting,
the dryer runs normally.
Temperature Differential--The
upper right cursor is flashing indicat-
ing the mode. If the flame shuts off
because the temperature is greater
than the high limit set point, the tem-
perature must fall below the (Set Point
minus Temperature Differential) for
the flame to come back on.
Programming the high-limit set point.