B&C Technologies M720 Dryer Control (DE, DP, DI Series) - Manual (Page 34)

13. Del. check airflow
When a program is started the controller will check if the airflow switch (input 3) is in the off
position. After that the blower will be started. After starting the blowers the airflow switch
should go to the on position within a given period otherwise an alarm will be displayed.
This parameter is the delay interval between the moment the blower starts and the moment
the airflow switch should be in the on position.
4.6 Test Program Menu
To be able to track malfunctions and to check correct functioning of all inputs and outputs, the
M720 controller is equipped with various test functions. These test functions can help service staff
to find malfunctioning inputs or outputs faster.
If the item Test program menu is selected from the main menu, this menu will be activated. In this
menu an item can be selected with the A
RROW U P and/or A RROW D OWN key. Confirming the
choice of an item must done with the E NTER key.
4.6.1 View Status of Inputs
In this screen all available inputs can be monitored. When the screen is activated, the module
number will be set to 0. Module 0 is the controller itself. If extension boards are connected, an
extension board can be selected with the A
RROW U P and/or A RROW D OWN key. If no extension
boards are connected, the arrow keys will not be visible. Module number 1 is the extension board
with address number 1, module 2 is the extension board with address 2, and so on.
After selecting a module number, an input number can be chosen with the P LUS and M INUS keys.
The dryer controller itself has 16 inputs, extension boards each have 8 inputs. If module number 0
is selected, the input number can vary between 1 and 16. If an extension board (module number 1
to 8) is selected, the input number can vary between 1 and 8.
On the lower line of the display, the current status of the input is shown. If an input receives a 24V
signal the status of the input will be ON and if no signal is received on the input, the status of the
input will be OFF.
The following example will explain how to test the door closed input. The input for door closed is
input 1 on the dryer controller. To check the status of this input first select module number 0 with
the A
RROW U P and/or A RROW D OWN key. Module number 0 means viewing the inputs on the
dryer controller itself. After that select channel number 1 with the P LUS and/or M INUS . Channel
number 1 means input 1. If the module number is set to 0, and the channel number is set to 1, the
input status of the door closed input is shown. If the door is closed, the status of the input should
be ON. If the door is opened, the status of the input should change to OFF.
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