Digital controller for m edium-low temperature
refrigeration applications
XW30LH – XW30LRH
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.
• Dixell Srl reserves the right to change the composition of its products, even without notice, ensuring
the same and unchanged functionality.
1.2
SAFETY PRECAUTIONS
• Check the supply voltage is c orrect before connecting the instrum ent.
• Do not expose to water or moisture: use the controller only within the operating limits avoiding sudden
temperature changes with high atmospher ic humidity to prevent formati on of condensation
• Warning: disconnect all electrical connections before any kind of maintenance.
• Fit the probe where it is not acc es sible by the End User. The instrument m ust 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 whic h c an be appl ied 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 usef ul.
2. GENERAL DESCRIPTION
Models XW30LH and XW30LRH, format 38x 185mm, are m icroproces sor based controll ers, suitable
for normal temperature appl ications on ventilated refrigerating uni ts. They have 3 relay outputs to
control compressor, fan, and light.
They could be prov ided with a Real Ti me Clock which al lows programmi ng of up to 6 daily defrost
cycles, divi ded into hol iday s and wor kdays . A “Day and Night” function with two diff erent set points is
fitted for energy savi ng. T hey ar e also provided with up to 3 NTC or P T C pr obe i nputs , t he fi r s t one for
temperature control, the second one, to be located onto the evaporator, to control the defrost
termination temperatur e and to managed the fan. One of the digital i nputs can operate as third
temperature probe. The fourth probe is used to signal the c ondens er tem per at ure alarm or to display a
temperature. NOTE: the fourth probe is available only for XW30LH models.
The HOT KEY output allows connec ting the unit, by means of the external module XJ485-CX, to a
network line ModBUS-RTU compatible such as the dIXEL monitoring units of X-WEB family. It
allows programming the controller by means the HOT KEY programming keyboard.
The instrument is fully configurable through special parameters that can be easily programmed
through the keyboard.
3. CONTROLLING LOADS
3.1 COMPRESSOR
The regulation is perfor med according to the
temperature measured by the thermostat
probe with a posi tive diff erential 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 i n the thermostat probe the start and stop of the compress or are timed through
parameters Con and CoF.
3.2 DEFROST
Defrost is performed through a simple stop of the compressor.
The defrost inter v al depends on the pr es enc e of t he RTC (opt i onal ) . I f the RT C i s pr es ent i s c ont rolled
by means of parameter EdF:
- EdF=in: a defrost starts after elapsing the idF time (standard way for controller without RTC).
- EdF=rtC: defrosts are s cheduled by using a real time clock system, depending on the hours
set in the parameters Ld1..Ld6, during workdays, and in Sd1…Sd6 during holidays.
Other parameters are used t o control defrost cycles: its maximum l ength (MdF) and two defrost
modes: timed or controlled by the evaporator’s probe (P2P).
3.3 CONTROL OF EVAPORATOR FANS
The fan control mode is selected by means of the FnC parameter:
- FnC=C_n: fans will switch ON and OFF with the compressor and not run during defrost;
- FnC=o_n: fans will run even if the compressor is off, and not run during defrost;
- FnC=C_Y: fans will switch ON and OFF with the compressor and run during defrost;
- FnC=o_Y: fans will run continuously also during defrost.
After defrost, there is a timed fan delay allowing for drip time, set by means of the Fnd parameter.
An additional parameter FSt provides the setting of temper ature, detected by the evaporator pr obe,
above which the fans are always OFF. This is used to make sure circulation of air only if his
temperature is lower than set in FSt.
3.3.1 Forced activation of evaporator fans
This function, managed by the FCt parameter, is designed to avoid s hort cycles of evaporator fans,
which could happen when the contr ol l er i s s wi t c hed on or after a defrost (when the room air warms the
evaporator). If the temperature difference between t he evaporator and the room probes is higher than
the value set in the FCt parameter the fans are switched on. With FCt=0 this function is disabled.
3.3.2 Fans cyclic activation with compressor off.
When FnC=C-n or C-Y (fans working in parallel with the c ompr essor ), by means of the Fon and FoF
parameters the fans c an car ry out on and off cyc les even if the com press or is swi tched off . When the
compressor is s topped the fans go on worki ng for the Fon tim e. With Fon=0 the fans remain always
off, when the compressor is off.
4. FRONT PANEL COMMANDS
KEY COMBINATIONS:
+
To lock & unlock the keyboard.
+
To enter in programming mode.
+
To return to the room temperature display.
4.1 USE OF LEDS
Each LED function is described in the following table.
LED
MODE
FUNCTION
ON
Compressor enabled
Flashing
Anti-short cycle delay enabled
ON
Defrost enabled
Flashing
Drip time in progress
ON
Fans enabled
Flashing
Fans delay after defrost in progress.
ON
An alarm is occurring
ON
Continuous cycle is running
ON
Energy saving enabled
ON Light on
°C/°F
ON
Measurement unit
Flashing
Programming phase
5. AUTOMATIC KEYBOARD LOCK
To avoid accidental m odifications of the c ontroller settings , the XW30LH and XW30LRH keyboard
will be locked automatically if no key will be touched for 60 seconds. The controller will show
“LoC” flashing for few seconds when it’s lock ing. The light key is operating even if the keyboard i s
locked.
5.1 TO UNLOCK THE KEYBOARD
1. Touch any key.
2. The keys will be lighted.
3. Keep a key pushed for few seconds till the “on” message is displayed.
6. MAX & MIN TEMPERATURE MEMORIZATION
6.1 HOW TO SEE THE MIN TEMPERATURE
1. Press and release the DOWN key.
2. The “Lo” message will be displayed followed by the minimum temperature recorded.
3. By pressing the DOWN key again or by waiting 5 sec the normal display will be restored.
6.2 HOW TO SEE THE MAX TEMPERATURE
1. Press and release the UP key.
2. The “Hi” message will be displayed followed by the maximum recorded temperature.
3. By pressing the UP key again or by waiting 5 sec the normal display will be restored.
6.3 HOW TO RESET THE MAX AND MIN TEMPERATURE RECORDED
1. Keep SET key pressed more t han 3 sec, while the max or min tem perature is displ ayed. (rSt
message will be displayed).
2. To confirm the operation t he “rSt” message starts bl inking and the normal t emperature will be
displayed.
7. MAIN FUNCTIONS
7.1 TO SET THE CURRENT TIME AND DAY (ONLY WITH RTC)
When the instrument is switched on, it’s necessary to program the time and day.
1. Enter the Pr1 programming menu, by pushing the SET+ DOWN keys for 3 sec.
2. The rtC parameter is displayed. Push the SET key to enter the real time clock menu.
3. The Hur (hour) parameter is displayed.
4. Push the SET and set current hour by the UP and DOWN keys, then pus h SET to
confirm the value.
5. Repeat the same operations with Min (minutes) and dAy (day) parameters.
To exit: Push both SET+UP keys or wait for 15 sec without pushing any keys.
To display target set point; in programming mode it selects a parameter or confirm an
operation.
(DEF) To start a manual defrost.
(UP) To see the max stored temperature; in programming mode it browses the
parameter codes or increases the displayed value.
(DOWN) To see the min stored temperature; in programming mode it browses the
parameter codes or decreases the displayed value.
(OFF) To switch the instrument off, if onF=oFF.
(LiG) To switch the light, if oA3=Lig.
1592027560 XW30LH-XW30LRH GB r1.0 18.03.2015 XW30LH – XW30LRH 1/5
7.2 HOW TO SEE THE SET POINT
1. Push and immediately release the SET key: the display will show the
Set point value.
2. Push and immediately release the SET key or wait for 5 sec to display
the probe value again.
7.3 HOW TO CHANGE THE SETPOINT
1. Push the SET key more than 2 sec to change the Set point value;
2. The value of the set point will be displayed and the “°C” or “°F” LED will start blinking.
3. To change the Set value, push both UP and DOWN arrows within 10 sec.
4. To store the new set point value, push the SET key again or wait for 10 sec.
7.4 HOW TO START A MANUAL DEFROST
Push the DEF key more than 2 sec and to start a manual defrost.
7.5 HOW TO CHANGE A PARAMETER VALUE
To change any parameter, operate as follows:
1. Enter the Progr amming mode by pressing both SET+DOWN keys for 3 sec (the “°C” or “°F” LED
will start blinking).
2. Select the required parameter and then press the SET key to display its value.
3. Use UP or DOWN keys to change its value.
4. Press SET to store the new value and move to the following parameter.
To exit: press both SET+UP keys or wait for 15 sec without pressing any key.
NOTE: the set value is stored even when the procedure is exited by waiting the time-out to expire.
7.6 THE HIDDEN MENU
The hidden menu shows all the parameters of the instrument.
7.6.1 HOW TO ENTER THE HIDDEN MENU (Pr2)
1. Enter the Programmi ng mode by pressing the SET+DOWN keys for 3 sec (the “°C” or “°F”
LED will start blinking).
2. Released the keys and then push agai n the SET+DOWN keys more than 7 sec. The “Pr2”
label will be displayed immediately followed by the HY parameter.
NOW THE HIDDEN MENU IS DISPLAYED.
3. Select the required parameter.
4. Press the SET key to display its value
5. Use UP or DOWN keys to change its value.
6. Press SET to store the new value and move to the following parameter.
To exit: press SET+UP keys or wait for 15 sec without pressing any key.
NOTE1: if no parameters are pr esent in Pr1, after 3 sec the “noP” message will be displayed. K eep
the keys pushed till the Pr2 message is displayed.
NOTE2: the set value is stored even when the procedure is exited by waiting the time-out to expire.
7.6.2 MOVE A PARAMETER FROM Pr2 TO Pr1 AND VICEVERSA.
Each parameter present i n the P r 2 ( HI DDEN M E NU) can be moved to the Pr1 (user level) by pressing
both SET+DOWN keys.
When in Pr2 (hidden menu) if a parameter is visible in Pr1, then the decimal point will be on.
7.7 MANUALLY LOCK AND UNLOCK THE KEYBOARD
+
HOW TO LOCK THE KEYBOARD
1. Keep both UP+DOWN keys pressed more than 3 sec.
2. The “PoF” message will be displayed and the keyboard is locked.
At this point it is only possible the viewing of the set point or the
MAX o Min temperature stored and to switch ON and OFF the light,
the auxiliary output and the instrument.
HOW TO UNLOCK THE KEYBOARD
Keep bothj UP+DOWN keys pressed more than 3 sec.
7.8 THE CONTINUOUS CYCLE
When defrost is not active, a continuous cycl e can be activated by keeping the UP key pressed for
about 3 sec. The compressor operates to mai ntain t he CCS set point for the time set through the CCt
parameter. The cycl e can be t er m i nated bef ore t he end of the s et ti m e by k eepi ng t he UP key pressed
3 sec.
7.9 THE ON/OFF FUNCTION
With onF=oFF, after pushing the ON/OFF key the instrument is switched off. The “OFF”
message will be displayed. In this configuration the regulation is disabled.
To switch the instrument on, push again the ON/OFF key.
WARNING: Loads connected t o th e nor mally closed contact s of t he rel ays are always supplied
and under voltage, even if the instrument is in stand by mode.
8. PARAMETERS
rtC
Real time clock menu (only for controller with RTC): to set the time, date and defrost
start time.
REGULATION
HY
Differential: ( 0.1 t o 25.5°C; 1 to 45°F ) i nter v enti on dif fer enti al for set point. Compressor
Cut IN is Set Point + dif ferential (HY). Compres sor Cut OUT is when the temperature
reaches the set point.
LS
Minimum set point: (-55°C to SET ; -67°F to SE T) sets t he mini mum val ue for the set
point.
US
Maximum set point: (S ET to 150°C; SE T to 302°F) set the maxi mum value for set
point.
Ot
Thermostat probe calibration: (-12.0 to 12.0°C; -21 to 21°F) all ows to adj ust possi ble
offset of the thermostat probe.
P2P
Evaporator probe presence: (n; Y) n = not present, the defrost stops by time;
Y = present, the defrost stops by temperature.
oE
Evaporator probe calibration: (-12.0 to 12.0°C; -21 to 21°F) all ows to adj ust pos si ble
offset of the evaporator probe.
P3P
Third probe presence (P3): (n; Y) n = not present, the terminals 18-20 operate as
digital input; Y = present, the terminals 18-20 operate as third probe.
o3
Third probe calibration (P3): (-12.0 t o 12.0°C; -21 to 21°F) allow s to adjust poss ible
offset of the third probe.
P4P
Fourth probe presence: (n; Y) n = Not present; Y = present.
NOTE: only for XW30LH model.
o4
Fourth probe calibration: (-12.0 to 12.0°C; -21 to 21°F) allows to adjust possible offset
of the fourth probe.
NOTE: only for XW30LH model.
odS
Outputs activation del ay at start up: (0 to 255min) this function is enabled at the initial
start up of the instr ument and inhibi ts any output acti vation for the period of ti me set i n
the parameter.
AC
Anti-short cycle delay: (0 t o 50min) minim um interval between the com pressor stop
and the following restart.
AC1
2nd compressor delay at st art up (0÷255s) Us ed only with oA3 or oA4 = cP2 Ti me
interval between the switching on of the first compressor and the second one.
NOTE: only for XW30LH model.
rtr
Percentage of the second and first probe for regulation: (0 to 100; 100=P1, 0=P2) it
allows to set the regulation according to the percentage of the first and second probe, as
for the following formula (rtr(P1-P2)/100 + P2).
CCt
Compressor ON time during continuous cycle: (0.0 to 24h00min, res. 10mi n) all ows
to set the length of the cont inuous cycle. Compressor stays on w ithout interruption
during CCt time. This is useful, for instance, when the room is filled with new products.
CCS
Set point for continuous cycle: (-55 to 150°C; -67 to 302°F) i t s ets t he set poi nt us ed
during the continuous cycle.
Con
Compressor ON time with faulty probe: (0 to 255min) time during which the
compressor is ac tive in case of faulty thermostat probe. With Con=0 compressor is
always OFF.
CoF
Compressor OFF time with faulty probe: (0 to 255min) time during which the
compressor is O FF in case of faulty thermostat probe. With CoF=0 compressor is
always active.
DISPLAY
CF
Temperature measurement unit: (°C; °F) °C = Celsius; °F = Fahrenheit.
WARNING: When the m easurement unit i s changed the SE T point and the v alues of
the parameters HY, LS, US, ot, ALU and ALL have to be checked and modified ( if
necessary).
rES
Resolution (for °C): (in=1°C; dE=0.1°C) allows decimal point display.
Lod
Instrument display: (P1; P2, P3, P4, SET , dtr) it s elec ts whi ch probe i s dis played by
the instrument. P1 = Thermostat probe; P2 = Evaporator probe; P3 = Third probe (only
for model with this option enabled); P4 = Fourth probe, SET = set point; dtr =
percentage of visualization.
dLY
Display delay: (0 t o 20m i n00s ; r es . 10s ) when the t em per atur e i nc r eas es, the di s pl ay
is updated of 1°C or 1°F after this time.
dtr
Percentage of the second an d first pro be for visualizat ion when Lod=dtr: ( 0 to
99; 100=P1, 0=P2) if Lod=dtr it allows to set the visualization according to the
percentage of the first and sec ond probe, as f or the fol lowi ng form ula ( dtr(P1-P2)/100
+ P2).
DEFROST
EdF
Defrost mode (only for controller with RTC):
- rtC: Real T ime Clock mode. Defrost time follows Ld1 to Ld6 parameters on
workdays and Sd1 to Sd6 on holidays.
- in: interval mode. The defrost starts when the time idf is expired.
dFP
Probe selection for defrost termination: (nP; P1; P2; P3; P4) nP = no probe;
P1 =thermostat probe; P2 = evaporator probe; P3 =configurable pr obe; P4 = Probe on
Hot Key plug.
dtE
Defrost terminati on temperature: (-55 to 50°C; -67 to 122°F ) (enabled only when
EdF=Pb) sets the temperatur e measured by the evaporator probe, which causes the
end of defrost.
idF
Interval between defr ost cycles: (0 to 120hours) determi nes the interval of time
between two defrost cycles.
MdF
(Maximum) length for defrost: (0 to 255min) when P2P=n, (not evaporator pr obe:
timed defrost) it sets the defrost duration. When P2P=Y (defrost end based on
temperature) it sets the maximum length for defrost.
dFd
Temperature displayed during defrost: (rt; it; SEt; dEF) rt = real temperature;
it = temperature at defrost start; SEt = set point; dEF = “dEF” label.
dAd
MAX display delay after d efrost : (0 to 255min) s ets the m axi mum t im e between the
end of defrost and the restarting of the real room temperature display.
FANS
FnC
Fans operating mode: (C-n; o-n; C-Y; o-Y) C-n = runs with the compressor, OFF during
defrost; o-n = c ontinuous mode, OFF duri ng defrost; C-Y = runs with the compres sor,
ON during defrost; o-Y = continuous mode, ON during defrost.
Fnd
Fans delay after defro st: (0 to 255min) i nterv al between end of defr ost and ev aporator
fans start.
FCt
Temperature differ ential to avoid fan short cycles: (0 t o 59°C; 0 to 90°F) (N.B.:
FCt=0 means funct ion disabl ed) if the differ ence of tem peratur e between the evapor ator
and the room probes is higher than FCt value, the fans will be switched on.
FSt
Fans stop temperature: (-55 to 50° C; -67 t o 122°F ) s et ti ng of tem per atur e, det ec ted by
evaporator probe, above which fans are always OFF.
Fon
Fan ON time: (0 to 15min) with Fnc=C_n or C_Y, (fan activated in parallel with
compressor) it sets t he evaporator fan ON cyc li ng t i m e when the c om pr es s or i s off . W i th
Fon=0 and FoF≠0 the fan are always off, with Fon=0 and FoF=0 the fan are always off.
FoF
Fan OFF time: (0 to 15min)
With FnC=C_n or C_Y, (fan ac tiv ated in par all el wi th com press or) i t s ets the ev aporator
fan off cycling time when the compressor is off.
With Fon=0 and FoF≠0 the fan are always off, with Fon=0 and FoF=0 the fan are
always off.
FAP
Probe selection for fan management: (nP; P1; P2; P3; P4) nP = no probe;
P1 =thermostat probe; P2 = evaporator probe; P3 =configurable probe; P4 = 4th Probe.
1592027560 XW30LH-XW30LRH GB r1.0 18.03.2015 XW30LH – XW30LRH 2/5
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