Weiss Instruments Dixell XR03CX Operating Manual

DIGITAL CONTROLLER
XR03CX – XR04CX
1. CONTENTS
1. Contents __________________________________________________________________________ 1
2.

General warnings ___________________________________________________________________ 1

3.

General description __________________________________________________________________ 1

4. Regulation _________________________________________________________________________ 1
5. Defrost ___________________________________________________________________________ 1
6.

Front panel commands _______________________________________________________________ 1

7. Parameters ________________________________________________________________________ 2
8. Installation and mounting _____________________________________________________________ 2
9. Electrical connections ________________________________________________________________ 2
10. How to use the hot key _______________________________________________________________ 2
11. Alarm signalling _____________________________________________________________________ 2
12. Technical data ______________________________________________________________________ 2
13. Connections _______________________________________________________________________ 2
14. Default setting values ________________________________________________________________ 3
2. GENERAL WARNINGS
PLEASE READ BEFORE USING THIS MANUAL
1. This manual is part of the product and should be kept near the instrument for easy and quick
reference.
2. The instrument shall not be used for purposes different from those described hereunder. It
cannot be used as a safety device.
3. Check the application limits before proceeding.
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
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.
3. GENERAL DESCRIPTION
The XR03CX, in 3274x50mm short format, is microprocessor based controller suitable for applications on
normal temperature refrigerating units. It provides two relay output: one for compressor and the other one for
alarm signalling or as auxiliary output. It provides two NTC probe inputs, one for room temperature and other
one to control defrost termination. The instrument is fully configurable through special parameters that can be
easily programmed through the keyboard or the by HOTKEY
The XR04CX, in 3274x50mm short format, is microprocessor based controller suitable for applications on
normal or low temperature refrigerating units. It provides two relay output: one for compressor and the other
one for defrost. It provides two NTC probe inputs, one for room temperature and other one to control defrost
termination. The instrument is fully configurable through special parameters that can be easily programmed
through the keyboard or the by HOTKEY.
4. REGULATION
The regulation is performed according to
the temperature measured by the
thermostat probe with a positive
differential from the set point: if the
temperature increases and reaches set
point plus differential 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 "Cy" and "Cn".
5. DEFROST
XR03CX
Defrost is performed through a simple stop of the compressor. Parameter "id" controls the interval
between defrost cycles, while its length is controlled by parameter "Md" and the end defrost
temperature dE
XR04CX
Two defrost modes are available through the "td" parameter:
 td=EL  defrost through electrical heater (compressor OFF)
 td=in  hot gas defrost (compressor ON).
Other parameters are used to control the interval between defrost cycles (id) ), its maximum length
n
( d) and two defrost modes: timed or controlled by the evaporator's probe. At the end of defrost
dripping time is started, its length is set in the dt parameter. With dt=0 the dripping time is disabled.
XR03/04CX 03132014_MM
Operating Manual
6. FRONT PANEL COMMANDS
KEYS COMBINATION
+
+
LED MODE
On
Flashing
On
Flashing
On
Flashing
On
Flashing
formation of
HOW TO SEE THE SET POINT
1. Push and immediately release the SET key, the set point will be showed;
2. Push and immediately release the SET key or wait about 5s to return to normal visualisation.
HOW TO CHANGE THE SETPOINT
1. Push the SET key for more than 2 seconds to change the Set point value;
2. The value of the set point will be displayed and the "°C" or "°F" LED starts blinking;
3. To change the Set value push the
4. To memorise the new set point value push the SET key again or wait 10s.
HOW TO START A MANUAL DEFROST
Push the DEF
HOW TO CHANGE A PARAMETER VALUE
To change the parameter's value operate as follows:
1. Enter the Programming mode by pressing the SET+
blinking).
2. Select the required parameter. Press the "SET" key to display its value
3. Use or
4. Press "SET" to store the new value and move to the following parameter.
To exit: Press SET+
NOTE: the set value is stored even when the procedure is exited by waiting the time-out to expire.
HIDDEN MENU
The hidden menu includes all the parameters of the instrument.
HOW TO ENTER THE HIDDEN MENU
1. Enter the Programming mode by pressing the SET+
blinking).
2. Released the keys, then push again the SET+
displayed immediately followed from the Hy parameter.
NOW YOU ARE IN THE HIDDEN MENU.
3. Select the required parameter.
4. Press the "SET" key to display its value
5. Use or
6. Press "SET" to store the new value and move to the following parameter.
To exit: Press SET+
NOTE1: if none parameter is present in L1, after 3s the "nP" message is displayed. Keep the keys
pushed till the L2 message is displayed.
NOTE2: the set value is stored even when the procedure is exited by waiting the time-out to expire.
HOW TO MOVE A PARAMETER FROM THE HIDDEN MENU TO THE FIRST
LEVEL AND VICEVERSA.
Each parameter present in the HIDDEN MENU can be removed or put into "THE FIRST LEVEL"
(user level) by pressing SET+
decimal point is on.
TO LOCK THE KEYBOARD
Keep pressed for more than 3s the
The "OF" message will be displayed and the keyboard will be locked. If a key is pressed more than
3s the "OF" message will be displayed.
TO UNLOCK THE KEYBOARD
Keep pressed together for more than 3s the
XR03CX – XR04CX
To lock or unlock the keyboard
+
To enter in programming mode
To return to room temperature display
SIGNIFICANCE
Compressore enabled
Anti short cycle delay enabled (AC parameter)
Defrost in progress
Dripping in progress
Measurement unit
Programming mode
Measurement unit
Programming mode
arrows within 10s.
or
key for more than 2 seconds and a manual defrost will start
keys for 3s ("°C" or "°F" LED starts
to change its value.
or wait 15s without pressing a key.
keys for 3s ("°C" or "°F" LED starts
keys for more than 7s. The L2 label will be
to change its value.
or wait 15s without pressing a key.
. In HIDDEN MENU when a parameter is present in First Level the
and keys.
and keys till the "on" message will be displayed.
To display target set point, in
programming mode it selects a
parameter or confirm an
operation
To start a manual defrost
In programming mode it
browses the parameter codes
or increases the displayed
value
In programming mode it
browses the parameter codes
AUX
or decreases the displayed
value