F
Operating instructions
cod. 1592001330
1592001330 XC642C GB r1.0 07.06.2004.doc
rel. 1.0
Pa. 3 / 21
18.
RS485 SERIAL LINK ______________________________________________________ 16
19.
TECHNICAL FEATURES___________________________________________________ 16
20.
ALARMS LIST ___________________________________________________________ 16
20.1
Types of alarms and signalling managed _____________________________________________ 16
20.2
Alarm muting ___________________________________________________________________ 18
20.3
Alarm conditions – summary table __________________________________________________ 18
21.
WIRING CONNECTIONS___________________________________________________ 20
22.
PARAMETERS – DEFAULT VALUES ________________________________________ 20
1. General warning
1.1
PLEASE READ BEFORE USING THIS MANUAL
•
This manual is part of the product and should be kept near the instrument for easy and quick reference.
•
The instrument shall not be used for purposes different from those described hereunder. It cannot be
used as a safety device.
•
Check the application limits before proceeding.
1.2
SAFETY PRECAUTIONS
•
Check the supply voltage is correct before connecting the instrument.
•
Do not expose to water or moisture: use the controller only within the operating limits avoiding sudden
temperature changes with high atmospheric humidity to prevent formation of condensation
•
Warning: disconnect all electrical connections before any kind of maintenance.
•
Fit the probe where it is not accessible by the End User. The instrument must not be opened.
•
In case of failure or faulty operation send the instrument back to the distributor or to “Dixell S.p.a.” (see
address) with a detailed description of the fault.
•
Consider the maximum current which can be applied to each relay (see Technical Data).
•
Ensure that the wires for probes, loads and the power supply are separated and far enough from each
other, without crossing or intertwining.
•
In case of applications in industrial environments, the use of mains filters (our mod. FT1) in parallel with
inductive loads could be useful.
2. General Descriprion
The
XC642C
is a controller for screw compressor racks, the main objective of controller is to hold the
controlled variable at constant value, this function is performed via compressor power control.
The controller survey the pression via 2 pression probe with 4÷20mA current output, while the regulation type
is ON/OFF.
Alternatively you can to use NTC or PTC temperature probes. The pression data are converted to
correspondent gas temperature value according to tables that are stored into controller.
The alarms management is performed by an alarm input for every user. The programming procedure is
simplified by HOT KEY use. The communication is performed via ModBus RTU protocol.
3. First Installation
At first installation, it’s necessary the following:
1.
Select the kind of gas.
2.
Set the range of the pressure probes.
In the following paragraph a short cut for the above operations.
Chapters 3.1
How to select the gas type
and 3.2 How to set the range of the pressure probes
will show in
detail these operations.
