dIXEL
Installing and Operating Instructions
1598026100
1598026100 XR420C GB r1.0 22.02.2007.doc
XR420C
1/4
XR420C
DUAL TEMPERATURE CONTROLLER
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 DESCRIPTION
Model
XR420C
, 32x74 mm format, is a microcontroller based device, able to control 2 temperatures
in an independent way.
Both sections
are suitable for applications on normal or medium
temperature refrigerating units or cooking applications. It is provided with 3 relay outputs to control
two compressors and one light. Defrost process is performed through simple stop of compressors.
It is also provided with 2 NTC or PTC probe inputs, one for section 1 and the other one for section 2.
There is one digital input (free voltage contact) completely configurable by parameter. 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.
REGULATION
Two kinds of actions are available for both sections: cooling action and heating action. The type is
selected through
cH1/cH2
section parameter.
3.1
HOW TO SET THE TYPE OF ACTION
By means of
CH1/2
parameters the kind of action can be set for each section:
cH1/cH2 = CL
:
refrigerating action (1/2);
cH1/cH2 = Ht
: heating action (1/2)
3.2
CH1/CH2 = CL FOR COOLING ACTION
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)
”.
3.3
CH1/CH2 = HT FOR HEATING ACTION
For each section, the regulation is performed
according to the temperature measured by its
own thermostat probe with a negative
differential from the set point. If temperature
decreases and reaches set point 1/2 minus
differential 1/2 the output is activated and then
turned off when the temperature reaches the
set point value again and then turned off when
the temperature reaches the set point value
again.
NOTE: For turn-off defrost you can set
MdF1/MdF2 = 0.
4.
DEFROST
4.1
SECTION 1 (2)
Defrost is performed through a simple stop of the compressor for both sections. Different kinds of
defrosts are available for each section.
4.2
RELATION BETWEEN DEFROSTS
The relation between defrosts is set by the
dFS
parameter:
relation between defrosts
.
4 relation between the 2 sections of the controller are available, to manage different kinds for
applications:
-
in
= independent defrosts;
-
StS
= same defrost start, synchronised defrost end;
-
St
= same defrost start, independent defrost end;
-
SE
=
sequential defrost;
4.2.1 dFS= in - independent defrosts
The defrosts of the 2 sections of controller are completely independent.
First section:
defrost interval is set by
idF1
parameter.
Second section:
defrost interval is set by
idF2
parameter.
The defrost interval is control by means of parameter “
EdF1(2)
”:
-
in
the defrost is made every “
IdF1(2)
” time
-
Sd
the interval “IdF1(2)” is calculate through Smart Defrost algorithm (only when the
compressor is ON)
Manual defrost activation, by pushing the DOWN key (defrost 1) or UP key (defrost 2).
By pushing the Down key or Up key for 3s, a defrost request is generated for section 1 or 2
respectively. The defrost interval is re-loaded.
4.2.2 dFS = StS – Same defrost start, end defrost synchronised or dFS = St
- Same defrost start, end defrost independent.
The defrost of the 2 sections of controller starts at the same time.
idF1
parameter sets the defrost
interval for both the sections. The defrosts are performed at regular interval if EdF1 = in or according
to the Smartdefrost algorithm if EdF1 = Sd.
With
dFS = StS
regulation restarts only when defrost is finished for both the sections. The section
that finishes the defrost before the other starts dripping time until also the other section has not
finished its defrost.
Manual defrost activation, by pushing the DOWN key (defrost 1) or UP key (defrost 2).
By pushing the Down key or Up key for 3s, a defrost request is generated for both the sections 1
and 2.The defrost interval is re-loaded.
With
dFS = St
each section restarts regulation as soon as its defrost is finished.
4.2.3 dFS = SE – sequential defrost
The defrost of 2 sections is synchronised.
idF1
parameter sets the defrost interval for both the
sections. Defrosts are performed at regular interval if EdF1 = in or according to the Smartdefrost
algorithm if EdF1 = Sd. Section 1 does its defrost first, at the end of the defrost of section 1, section
2 starts its defrost..
Manual defrost activation, by pushing the DOWN key (defrost 1) or UP key (defrost 2).
By pushing the Down key or Up key for 3s, a defrost request is generated for both the sections 1
and 2.The defrost interval is re-loaded.
5.
THE DISPLAY
X-
--
-C
XR
4
0
0
The display is divided in
2 parts
:
Upper left part:
to see the temperature2
(upper display)
Lower left part:
to see the temperature1
(lower display)
SET
To display and modify target set point 1 and set point 2, in programming mode it
selects a parameter or confirm an operation.
light activation/deactivation.
o/
(
UP/DEFROST 2)
in programming mode it browses the parameter codes or
increases the displayed value. By holding it pressed for 3s the defrost for section 2
is started.
n/
(
DOWN/DEFROST 1)
in programming mode it browses the parameter codes or
decreases the displayed value. By holding it pressed for 3s the defrost for section 1
is started.
o
+
n
To lock and unlock the keyboard.
SET +
n
To enter the programming mode.
SET +
o
To exit the programming mode.
5.1
MEANING OF THE ICONS
Icon
FUNCTION
Meaning
ON Celsius
degree
ON Fahrenheit
degree
ON
Compressor 1 on
FLASHING
Anti-short cycle delay enabled for compressor 1
ON
Compressor 2 on
FLASHING
Anti-short cycle delay enabled for compressor 2
ON
Defrost 1 in progress
ON
Defrost 2 in progress
ON ALARM
signal
Temperature2
Temperatature1
