1592001530 XC15-35CX EN r1.2 11.04.2017 XC15-35CX 35/40
17.6 READING FILTER
It is possible to activate a reading filter which acts on the analogue input values (eg.
Pressure/temperature values coming from probes). Following the involved parameters:
- FiC=mEd, the used value for regulation is the average value calculated on the
interval of time tdG
- FiC=1...100, the used value for regulation is the one calculated by an exponentially
weighted moving average filter with coefficients FiC/100. When FiC=100 this filter is
disabled.
18. DIGITAL INPUTS
There are up to 3 digital inputs available. Two of them are multiplexed with the temperature
probe P3 and P4 and they are enabled when PxP=n, x=3,4.
The possible functions connected to the digital inputs are explained in the following
paragraphs.
The polarity of any digital input can be modified by using the par. ixP:
- ixP=CL: means that the digital input is active when the external contact is closed
- ixP=oP: means that the digital input is active when the external contact is open
18.1 DIGITAL INPUT DISABLED – ixF=nu
The digital input set as nu will be not checked from the device.
18.2 REGULATION ENABLED – ixF=Enb
In this case the digital input will act as enabling input. The regulation will start only if the
signal is present. If the regulation is locked, the display will show the Lod variable alternated
with the label “onF” in order to signal the external lock active.
18.3 LOW AND HIGH PRESSURE ALARMS – ixF=LP or HP
This signal is used to signal that a low or high pressure value is present on the cooling circuit.
The regulation lock can be temporary or permanent depending on the number of digital input
activations (par. nPx) in a predefined interval of time (par. PEi).
18.3.1 TEMPORARY REGULATION LOCK
A single digital input activation causes the compressor outputs deactivation (delayed of 1 sec
each from the other). In addition to this:
- alarm LED and digital output set as alarm (oAx=ALr) will be activated;
- all the compressor outputs (oA1, oA2) will be deactivated (delayed of 1 sec each from
the other);
- solenoid valve control output (oA3=dGt, d4d) will be deactivated;
- oA1=dGt,d4d and oA3=dGt,d4d will be deactivated at the same time;
- analogue output will be deactivated (0V or 0Hz);
- the display will show the relative error label “LP” or “HP”;
- the buzzer will be activated (depending on the par. bEn);
- the error will be saved into the database.
The regulation will restart as soon as the digital input will be deactivated, respecting all the
safety delays.
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