2.2 - DESCRIPTION OF INPUTS
The following activation window applies to each input on the terminal board. The only exception is the three inputs flow
switch, pressure switch and manual activation, where it is possible, from the configuration menu (CONF button), to
exchange the rest window with the alarm window (for NC or NO type inputs).
In the default configuration, all inputs are balanced with a 5.4kΩ nominal "End-of-Line" resistor, Rest value, obtained
from the series of two 2.7kΩ resistors. An NO contact is applied to one of the two resistors at rest. The input is activated
when the contact is closed and the nominal resistance drops to 2.7kΩ, the Activation value.
A resistance drift control algorithm is applied to each input, and if the resistance value falls within the resistance ranges
L, M and H, an input level fault '... undetermined low', '... undetermined medium' and '... undetermined high' is provided.
Other faults that can be signalled by an input are: "short-circuited", "open" with obvious meaning, in addition diagnostics
in "fault" and "unstable". In the latter case it means that the input is constantly changing between states but does not
remain there long enough.
1K 1k2 3k8 4k2 6k5 7k
N.B. The maximum number of devices that can be connected to the line (manual override controls, emergency
override and emergency stop controls) depends on the distance from the unit and their power consumption.
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