B&C Technologies M720 Dryer Control (DE, DP, DI Series) - Manual (Page 17)

sensor or a humidity sensor, the text D RYING will be toggled with the current automatic drying
value. Automatic drying means that the current drying method in the program parameters is set
to A
UTO . If so, the controller will continuously check if the current batch is dry. To determine this,
it will use a second temperature sensor, an infra-red sensor or a humidity sensor, whichever one is
available.
3.2.2 Status Line with Humidity Sensor
If a humidity sensor is present (and set in the machine configuration), the humidity sensor is
placed in the exhaust. It can then measure the humidity of the outlet air to detect if the batch is
dry. Program parameter 10 is used to determine if the batch is dry. If a humidity sensor is present,
the 2
nd line may look like:
24 / 75
o
C 23%
The value on the right is the current measured air humidity by the humidity sensor. If the value is
measured below the programmed value for long enough, the batch is considered to be dried.
3.2.3 Status Line with Times
As explained, the status line with times may look like this:
30m + 40m
The symbol indicates that the drying step is active. The estimated remaining time for drying
is 30 minutes. If the cool-down step is active, the symbol will be replaced by the symbol.
The + symbol is a symbol for the total time remaining. The total time remaining is the es-
timated remaining drying time plus the estimated remaining cool-down time. In this example, the
total estimated time left is 40 minutes. From this we can also derive that the estimated remaining
cool-down time is 10 minutes. Because the estimated remaining drying time is 30 minutes and the
estimated remaining total time is 40 minutes, the estimated remaining cool-down time is 40 - 30 =
10 minutes.
3.2.4 Numeric Display
Just above the graphical display, there are three 7-segment displays. These 7-segment displays can
only be used to display numbers and some simplified symbols. The 7-segment displays will be
referred to as the numeric display.
The numeric display is larger than the graphical display, which means that it can be read from
further away. It is used to indicate the current alarm number, the estimated total cycle time left
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