Operating instructions
cod. 1592011000
1592011000 XC706M GB 31-08-2001
rel. 1.0
Pa. 3 / 23
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.
•
The instrument must not be opened.
•
In case of failure or faulty operation send the instrument back to the distributor or to
“DIXELL s.r.l.” (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.
•
Fit the probe where it is not accessible by the end user.
•
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 description
The XC706M controller is thought to manage compressors in a system such as a pack.
The compressors can be simple, multistage or with different capacities.
Control is by means of a neutral zone or proportional band and is based on the pressure or
temperature sensed in the LP suction (compressors) circuits. A special algorithm balances the
run hours of the compressors to distribute the work load uniformly.
The controllers can convert LP pressure and display it as temperature.
The front panel offers complete information on the system’s status by displaying the suction
pressure (temperature), the status of the loads, possible alarms or maintenance conditions.
Each load has its own alarm input that is able to stop it when activated. To guarantee the total
system’s safety, there are also an input for low pressure switch: when this is activated, the
system is stopped.
By means of the HOT KEY the controller can be easy programmed at power on.
The controller can be connected to the XJ500, controlling and monitoring system, thanks to the
RS485 output, using the standard ModBus RTU protocol.
