dIXEL
dIXEL
dIXEL
dIXEL
Operating manual
cod. 1592
cod. 1592
cod. 1592
cod. 1592017
017
017
017050
050
050
050
1592017050 XLR470 GB r1.0 24.05.07.doc
XLR470
3/18
1.
GENERAL WARNINGS
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 DESCRIPTION
Model
XLR470
, 32x74 mm format, is a microprocessor based controller, able to control 2 temperatures in an independent way.
The first section
is suitable for applications on medium or low temperature refrigerating units. It is provided with 3 relay outputs to control
compressor, defrost - which can be either electrical or hot gas - and the evaporator fans. It is also provided with 2 NTC or PTC probe inputs, one for
temperature control the other one to control the defrost end temperature of the evaporator.
The second section
is suitable for applications on medium or low temperature refrigerating units. It is provided with 3 relay outputs to control
compressor, defrost - which can be either electrical or hot gas - and the evaporator fans. It is also provided with 2 NTC or PTC probe inputs, one for
temperature control the other one to control the defrost end temperature of the evaporator..
There are two digital inputs (free contact) completely configurable by parameters.
The standard TTL output allows the user to connect, by means of a TTL/RS485 external module, a
ModBUS-RTU
compatible monitoring system and
to programme the parameter list with the
“Hot Key”.
3.
TEMPERATURE CONTROL
1.
THE COMPRESSOR 1 (2)
For each section, the regulation is performed according to the
temperature measured by its own thermostat probe with a positive
differential from the set point.
If the temperature increases and reaches set point1 (2) plus
differential1 (2) the compressor is started and then turned off when
the temperature reaches the set point value again.
In case of fault in the thermostat probe the start and stop of the compressor are timed through parameters “
COn1(2)
” and “
COF1(2)
”.
4.
DEFROST
1.
SECTION 1
For the
section 1
two defrost modes are available through the “
tdF1
” parameter:
tdF1= rE
defrost with electrical heater
tdF1= in
or hot gas.
The defrost interval is control by means of parameter “
EdF1
”:
rtc (only for instruments with RTC):
beginning of defrost cycles is set by the
L1d1÷L1d6
parameters during the working days and
S1d1÷S1d6
during the holidays
in
the defrost is made every “
IdF1
” time
Sd
the interval “IdF” is calculate through Smart Defrost algorithm (only when the compressor is ON)
At the end of defrost the drip time is controlled through the “
Fdt1
” parameter.
