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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 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.
3. GENERAL DESCRIPTION
The XR03CX, in 3274x50mm 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 3274x50mm 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
(
nd) 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.
6. FRONT PANEL COMMANDS
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
KEYS COMBINATION
+
To lock or unlock the keyboard
To enter in programming mode
LED MODE
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+
2. Select the required parameter. Press the “SET” key to display its value
3. Use
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.
+
On Compressore enabled
Flashing
On Defrost in progress
Flashin
On
Flashing Programming mode
On
Flashing Programming mode
blinking).
or to change its value.
To return to room temperature display
SIGNIFICANCE
nti short cycle delay enabled (AC parameter)
Dripping in progress
Measurement unit
Measurement unit
or arrows within 10s.
key for more than 2 seconds and a manual defrost will start
or wait 15s without pressing a key.
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
or to change its value.
5. Use
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 th e 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 FI RST
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 and keys.
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 and keys till the “on” message will be displayed.
or wait 15s without pressing a key.
. In HIDDEN MENU when a parameter is present in First Level the
keys for more than 7s. The L2 label will be
value
In programming mode it
browses the parameter codes
AUX
or decreases the displayed
value
keys for 3s (“°C” or “°F” LED starts
keys for 3s (“°C” or “°F” LED starts
XR03/04CX 03132014_MM XR03CX – XR04CX
Operating Manual
7. PARAMETERS
REGULATION
Hy Differential: (0,125°C / 1 ÷ 45°F) Intervention differential for set point. Compressor Cut IN is
SET POINT + differential (Hy). Compressor Cut OUT is when the temperature reaches the set
point.
LS Minimum SET POINT: (-55°C÷SET/-67°F÷SET): Sets the minimum value for the set point..
US Maximum SET POINT: (SET÷99°C/ SET÷99°F). Set the maximum value for set point.
ot First probe calibration: (-9.9÷9.9°C / -99 ÷ 99°F) allows to adjust possible offset of the first
probe.
P2 Evaporator probe presence: n= not present; y= the defrost stops by temperature.
oE Second probe calibration: (-9.9÷9.9°C / -99 ÷ 99°F) allows to adjust possible offset of the
second probe.
od Outputs activation delay at start up: (0÷99min) This function is enabled at the initial start up
of the instrument and inhibits any output activation for the period of time set in the parameter.
AC Anti-short cycle delay: (0÷50 min) minimum interval between the compressor stop and the
following restart.
Cy Compressor ON time with faulty probe: (0÷99 min) time during which the compressor is
active in case of faulty thermostat probe. With Cy=0 compressor is always OFF.
Cn Compressor OFF time with faulty probe: (0÷99 min) time during which the compressor is
OFF in case of faulty thermostat probe. With Cn=0 compressor is always active.
DISPLAY
CF Measurement unit: (°C÷°F) °C =Celsius; °F =Fahrenheit. WARNING: When the
measurement unit is changed the SET point and the values of the parameters Hy, LS, US, oE,
o1, AU, AL have to be checked and modified if necessary).
rE Resolution (only for °C):(dE ÷ in) dE= decimal between -9.9 and 9.9°C; in= integer
Ld Default display: (P1 ÷ P2) P1= thermostat probe; P2= evaporator probe. SP=Set point
dy Display delay: (015 min.) when the temperature increases, the display is updated of 1 °C/1°F
after this time.
DEFROST
td Defrost type: (EL – in) EL= electrical heater, compressor OFF; in= hot gas, compressor ON;
dE Defrost termination temperature: (-55÷50°C / -67÷99°F) if P2=Y it sets the temperature measured
by the evaporator probe, which causes the end of defrost.
id Interval between defrost cycles: (0÷99 ore) Determines the time interval between the
beginning of two defrost cycles.
nd Maximum length for defrost: (0÷99 min. w ith 0 no defrost) when P2=n, (not evaporator
probe: timed defrost) it sets the defrost duration, when P2 = y (defrost end based on
temperature) it sets the maximum length for defrost.
dd Start defrost delay: ( 0÷99min) This is useful when different defrost start times are necessary
to avoid overloading the plant.
dF Display during defrost: (rt / it / SP / dE) rt= real temperature; it= start defrost temperature;
SP= SET-POINT; dE= label dE.
dt Drip time: (0÷99 min) time interval between reaching defrost termination temperature and the
restoring of the control’s normal operation. This time allows the evaporator to eliminate water
drops that might have formed due to defrost.
dP Defrost at power –on: (y÷n) y= at power on defrost starts; n= defrost doesn’t start at power-on
ALARM
AU Maximum temperature alarm: (AL÷99°C/99°F) when this temperature is reached the alarm
is enabled, after the “Ad” delay time.
AL Minimum temperature alarm: (-55÷AU°C /-67÷AU°F) when this temperature is reached the
alarm is enabled, after the “Ad” delay time.
Ad Temperature alarm delay: (0÷99 min) time interval between the detection of an alarm
condition and alarm signalling.
dA Exclusion of temperature alarm at startup: (0÷99 min) time interval between the detection of the
temperature alarm condition after instrument power on and alarm signalling.
OTHER
d1 Thermostat probe display (read only)
d2 Evaporator probe display (read only)
Pt Parameter code table
8. INSTALLATION AND MOUNTING
Instrument XR03CX and XR04CX shall be mounted on vertical
panel, in a 29x71 mm hole, and fixed using the special bracket
supplied.
The temperature range allowed for correct operation is 060 °C.
Avoid places subject to strong vibrations, corrosive gases,
excessive dirt or humidity. The same recommendations apply to
probes. Let air circulate by the cooling holes.
9. ELECTRICAL CONNECTIONS
The instrument is provided with screw terminal block to connect cables with a cross section up to 2,5
2
. Before connecting cables make sure the power supply complies with the instrument’s
mm
requirements. Separate the probe cables from the power supply cables, from the outputs and the
power connections. Do not exceed the maximum current allowed on each relay, in case of heavier
loads use a suitable external relay.
1.1 PROBES
The probes shall be mounted with the bulb upwards to prevent damages due to casual liquid
infiltration. It is recommended to place the thermostat probe away from air streams to correctly
measure the average room temperature. Place the defrost termination probe among the evaporator
fins in the coldest place, where most ice is formed, far from heaters or from the warmest place during
defrost, to prevent premature defrost termination.
10. HOW TO USE THE HOT KEY
1.2 HOW TO PROGRAM THE HOT KEY FROM THE INSTRUMENT (UPLOAD)
1. Program one controller with the front keypad.
2. When the controller is ON, insert the “Hot key” and push
followed a by flashing “Ed”
3. Push “SET” key and the “Ed” will stop flashing.
4. Turn OFF the instrument remove the “Hot Key”, then turn it ON again.
NOTE: the “Er” message is displayed for failed programming. In this case push again o key if you
want to restart the upload again or remove the “Hot key” to abort the operation.
key; the "uP" message appears
1.3 HOW TO PROGRAM AN INSTRUMENT USING HOT KEY (DOWNLOAD)
1. Turn OFF the instrument.
2. Insert a programmed “Hot Key” into the 5 PIN receptacle and then turn the Controller ON.
3. Automatically the parameter list of the “Hot Key” is downloaded into the Controller memory, the
“do” message is blinking followed a by flashing “Ed”.
4. After 10 seconds the instrument will restart working with the new parameters.
5. Remove the “Hot Key”.
NOTE: the “Er” message is displayed for failed programming. In this case push again o key if you
want to restart the upload again or remove the “Hot key” to abort the operation.
11. ALARM SIGNALLING
Mess. Cause
"P1" Room probe failure
"P2" Evaporator probe failure
"HA" Maximum temperature alarm Outputs unchanged
"LA" Minimum temperature alarm Outputs unchanged
1.4 ALARM RECOVERY
Probe alarms P1” and “P2” start some seconds after the fault in the related probe; they automatically
stop some seconds after the probe restarts normal operation. Check connections before replacing
the probe. Temperature alarms “HA” and “LA” automatically stop as soon as the temperature returns
to normal values.
Alarms “EA” and “CA” (with iF=bA) recover as soon as the digital input is disabled.
Outputs
Compressor output according to “Cy” e “Cn”
Defrost end is timed (Only XR04CX)
12. TECHNICAL DATA
Housing: self extinguishing ABS.
Case: frontal 32x74 mm; depth 50mm;
Mounting: panel mounting in a 71x29mm panel cut-out
Protection: IP20; Frontal protection: IP65
Connections: Screw terminal block 2,5 mm
Power supply: according to the model 110Vac 10%, 50/60Hz --- 230Vac 10%, 50/60Hz
Power absorption: 3.5 VA max
Display: 2 digits, red LED, 14,2 mm high; Inputs: Up to 2 NTC probes.
Relay outputs: compressor SPST 20(8)A 250Vac or 8(3) A 250Vac
defrost or Aux: SPDT 8(3) A 250Vac
Data storing: on the non-volatile memory (EEPROM).
Kind of action: 1B; Pollution grade: 2;Software class: A.;
Rated impulsive voltage: 2500V; Overvoltage Category: II
Operating temperature: 0÷60 °C; Storage temperature:
Relative humidity: 2085% (no condensing).
Measuring and regulation range: NTC probe: -40÷110°C.
Resolution: 0,1 °C or 1°C or 1 °F (selectable); Accuracy (ambient temp. 25°C): ±0,1 °C ±1 digit
13. CONNECTIONS
XR03CX
NOTE: In model with 110Vac the power supply has to be connected to 6-7 terminal
XR04CX
NOTE: In model with 110Vac the power supply has to be connected to 6-7 terminals.
2
wiring.
-25÷60 °C.
XR03/04CX 03132014_MM XR03CX – XR04CX
14. DEFAULT SETTING VALUES
LABEL DESCRIPTION RANGE DEFAULT
REGULATION
DISPLAY
DEFROST
ALARMS
OTHER
Differential
Minimum Set Point -55°C÷SET/-67°F÷SET -55 °C /-55°F
Maximum Set Point SET÷99°C/ SET÷99°F 99 °C / 99°F
First probe calibration -9.9÷9.9°C/-99÷99°F 0.0
Second probe presence n – Y y
Second probe calibration -9.9÷9.9°C/-99÷99°F 0.0
Outputs activation delay at
start up
Anti-short cycle delay 0 ÷ 50 min 1
Compressor ON time faulty
probe
Compressor OFF time faulty
probe
Measurement units °C - °F °C / °F
Resolution (only for °C) dE – in dE
Default Display P1-P2 P1
Display delay 0 ÷ 15 min 0
Defrost type EL – in EL
Defrost termination
temperature
Interval between defrost
cycles
Maximum length for defrost 0 ÷ 99 min. 30
Start defrost delay 0 ÷ 99 min. 0
Display during defrost rt – in – SP – dE it
Drip time 0 ÷ 99 min 0
Defrost at power-on y – n n
Maximum temperature alarm ALL÷99°C / ALL÷99°F 99 °C / 99 °F
Minimum te mperature alarm -55°C÷ALU/-67°F÷ALU -55 °C / -55 °F
Temperature alarm delay 0 ÷ 99 min 15
Exclusion of temperature
alarm at startup
Thermostat probe display Read Only - - -
Evaporator probe display Read Only - - -
Parameter code table Read Only - - -
Firmware release Read Only - - -
0.1 ÷ 25°C/1 ÷ 45°F
0 ÷ 99 min 0
0 ÷ 99 min 15
0 ÷ 99 min 30
-55÷50°C/-67÷99°F 8.0 °C / 46 °F
0 ÷ 99 hours 6
0 ÷ 99 min 90
Operating Manual
2.0°C / 4 °F
(631)207-1200 f (631)297-0900
sales@weissinstruments.com
Weiss Instruments, Inc.
905 Waverly Ave.
Holtsville, NY 11742
www.weissinstruments.com
XR03/04CX 03132014_MM XR03CX – XR04CX
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