Digital controller for medium-low temperature
refrigeration applications
XW60LH
1. GENERAL WARNING....................................................................................................................1
2. GENERAL DESCRIPTION ............................................................................................................1
3. CONTROLLING LOADS ................................................................................................................1
4. FRONT PANEL COMMANDS .......................................................................................................1
5. MAX & MIN TEMPERATURE MEMORIZATION ..........................................................................2
6. MAIN FUNCTIONS ........................................................................................................................2
7. PARAMETERS...............................................................................................................................2
8. DIGITAL INPUTS ...........................................................................................................................4
9. TTL SERIAL LINE – FOR MONITORING SYSTEMS ...................................................................4
10. X-REP OUTPUT – OPTIONAL ......................................................................................................4
11. INSTALLATION AND MOUNTING ................................................................................................4
12. ELECTRICAL CONNECTIONS .....................................................................................................4
13. HOW TO USE THE HOT KEY .......................................................................................................4
14. ALARM SIGNALS ..........................................................................................................................4
15. TECHNICAL DATA ........................................................................................................................5
16. CONNECTIONS .............................................................................................................................5
17. DEFAULT SETTING VALUES .......................................................................................................5
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 functi onal ity.
1.2
SAFETY PRECAUTIONS
• Check the supply voltage is c orrect before connecting the ins trument.
• 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 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 descri ption of the fault.
• Consider the maximum current w hi ch can be applied to each relay (see T ec hni cal 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.
• Dixell Srl reserves the right to change the composition of its products, even without notice, ensuring
the same and unchanged functi onal ity.
2. GENERAL DESCRIPTION
Model XW60LH, format 38x 185mm, is microproces sor b ased co ntroller , suit able for appli cations on
medium or low temperature ventilated refrigerating units. It has 4 relay outputs to control compressor,
fan, defrost, which can be either electric al or r everse cycle (h ot gas) and a fourth configurable output .
They c ould be provid ed with a Real Time Cl ock which allows programmi ng of up to 6 daily defros t
cycles, divided into holidays and workdays. A “Day and Night” function with two different set points is
fitted for energy saving. They are al s o pr ov i d ed with up to four NTC or PTC probe inputs, the first one
for temperatur e control, the second one, t o be located ont o the evaporator , to control the d efrost
termination t emperature and to m anaged the fan. One of the digital in puts can oper ate as third
temperature pr ob e. T he fourth probe is used t o signal the co nd ens er t emp erat ur e alarm or to dis play
a temperature.
The HOT KEY output al lows to connect t he unit, by me ans of the external m odule XJ4 85-CX, t o a
network line ModBUS-RTU compatible such as the dIXEL monitoring units of X-WEB family. It
allows to program the controller by means the HOT KEY programming keyboard.
The instrumen t is fully configurabl e through special paramet ers that can be easily programmed
through the keyboard.
3. CONTROLLING LOADS
3.1 COMPRESSOR
The regulati on is perform ed accordin g
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 i s started an d then tur ned
off when the t emperature re aches the
set point value again.
In case of fault i n the thermostat probe t he start and stop of the com pressor are timed thr ough
parameters Con and CoF.
3.2 DEFROST
Two defrost mo des are av ail able thr ough t he tdF parameter: defr ost thr ough el ectric al hea ter (t dF =
EL) and hot gas defrost (tdF = in).
The defrost i nterval depends on the presence of the RTC (optional). If the RTC is pr esent is
controlled 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 sched uled by using a real time cl ock system, dependi ng on the h ours set in
the parameters Ld1..Ld6, during workdays, and in Sd1…Sd6 during holidays.
Other paramet ers are used to control defr ost cycles: i ts maximum le ngth (MdF) and two defrost
modes: timed or controlled by the evaporator’s probe (P2P).
At the end of defros t dri pping ti me is starte d, it s lengt h is set in th e Fdt parame ter. Wit h Fdt=0 the
dripping time is disabled.
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, t h er e is a tim ed fan delay allowi n g f or drip time, set by mea ns of the Fnd parameter.
An additional paramet er FSt provid es the set ting of t emperat ure, de tected by the eva porator probe,
above which th e fans are always OFF. Thi s is used to make sure cir culation 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 av oid short c ycles of evaporator fans,
which c ould ha ppen whe n the con troller i s switc hed on or af ter a defr ost (wh en the room ai r warms
the evaporator ). If t he temperature differenc e b etwe en the ev a por ator and th e room pr obes is higher
than the value set in the FCt parameter th e fans are switched on. Wit h FCt=0 this function i s
disabled.
3.3.2 Fans cyclic activation with compressor off.
When FnC=C-n or C-Y (fans working in paral lel with the compr es s or ) , by means of th e Fon and FoF
parameters t he f a ns c a n c ar r y out on and off cy c l es ev e n if the compressor is switc h ed off. When th e
compressor i s st op ped t he f ans g o on work in g for the Fon time. Wit h Fon=0 the fans r emai n always
off, when the compressor is off.
3.4 AUXILIARY OUTPUT CONFIGURATION
The functioni ng of the auxili ary relay can b e set by the oAx parameters acc ording to the ki nd of
application. In th e fol l owing paragraph the possible settings are explaided.
3.4.1 Auxiliary thermostat
A possible use i s the anti c ondensing heater, with t he possibil ity of switc hing it on and off also by
keyboard.
Parameters involved:
- ACH: kind of regulation for the auxiliary relay: Ht: heating; cL: cooling;
- SAA: set point for auxiliary relay;
- SHy: differe ntial for auxili ar y rel ay ;
- ArP: probe for auxiliary relay;
- Sdd: auxiliary output off during defrost.
The differential is given by the SHy parameter.
The auxiliar y r el ay c a n be switched on al s o by using the AUX button. In this cas e i t remains on till it’s
manually switched off.
NOTE: If oAx=AUS and ArP=nP (no pr obe for auxiliary outp ut) , the AUX relay can b e activated onl y
by pushing the AUX button of the keyboard.
3.4.2 On/off relay – oAx = onF
In this case the relay is activat ed when the controll er is turned on and de-activate d when the
controller is turned off.
3.4.3 Neutral zone regulation
With oAx=db the AUX relay can control a heater element to perform a neutral zone action.
- output oAx cut in = SET-HY;
- output oAx cut out = SET.
3.4.4 Second compr es sor
With oAx=CP2, the AUX rel ay operat es as secon d compress or: it is acti vated in par allel wit h the
relay of the fir st compressor, with a proper activation delay (set i n the AC1 parameter). Bot h the
compressors are switched off at the same time.
3.4.5 Alarm relay
With oAx=ALr the A UX relay oper ates as alarm r elay. It i s activ ated ev ery tim e an al arm hap pens.
Its status depends on the tbA parameter:
- tbA=Y: the relay is silenced by pr es s i n g any key;
- tbA=n: the alarm relay remains on until the alarm condition recovers.
3.4.6 Night blind management during energy saving cycles
With oAx=HES the AUX relay o perates to m anage the ni ght blind: the relay i s energised w hen the
energy saving cycle is activated by digital input, frontal button or RTC (optional).
4. FRONT PANEL COMMANDS
To display targe t s et point; in programm i ng 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.
1592036000 XW60LH GB r1.0 18.03.2015 XW60LH 1/6
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 cycl e delay enabled
ON
Defrost enabled
Flashing
Drip time in progress
ON
Fans enabled
Flashing
Fans delay after defrost in progr es s .
ON An alarm is occurring
ON
Continuous cy cle is running
ECO
ON
Energy saving enabled
ON Light on
ON
Auxiliary relay on
°C/°F
ON
Measurement unit
Flashing
Programming p hase
5. MAX & MIN TEMPERATURE MEMORIZATION
5.1 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 dis pl ay wi ll be restored.
5.2 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.
5.3 HOW TO RESET THE MAX AND MIN TEMPERATURE RECORDED
1. Keep SET key pressed m ore than 3 sec, while the max or min tem perature i s display ed. (rSt
message will be displayed).
2. To c onfirm the op eratio n the “r St” mess age st arts bli nking and th e normal temper ature w ill be
displayed.
6. MAIN FUNCTIONS
6.1 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 c urrent hour by the UP and DOWN keys , then push SET to
confirm the value.
5. Repeat the same operations with Min (m inutes) and dAy (day) parame ter s .
To exit: Push both SET+UP keys or wait for 15 sec without pushing any keys.
6.2 HOW TO SEE THE SET POINT
1. Push and immediately release the SET key: th e di s play will show the
Set point value.
2. Push and immediately release the SET key or wait for 5 sec to
display the pro be val u e again.
6.3 HOW TO CHANGE THE SETPOINT
1. Pus h th e 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.
6.4 HOW TO START A MANUAL DEFROST
Push the DEF key more than 2 sec and to start a manual defrost.
6.5 HOW TO CHANGE A PARAMETER VALUE
To change any parameter, operate as follows:
1. Enter the P ro gramm in g mo de by pr ess in g both SET+DOWN keys for 3 sec (the “°C” or “°F” LED
will start blinking).
2. Select th e r equired 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.
6.6 THE HIDDEN MENU
The hidden menu shows all the parameters of the instrument.
6.6.1 HOW TO ENTER THE HIDDEN MENU (Pr2)
1. Enter t he Progr amming m ode by pres sing th e SET+DOWN k eys for 3 sec (the “°C” or “°F” LED
will start blinking).
2. Releas ed the key s 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: i f no p aram eters are present in Pr 1, af ter 3 sec the “noP” mes sag e will be dis played . Keep
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.
6.6.2 MOVE A PARAMETER FROM Pr2 TO Pr1 AND VICEVERSA.
Each paramet er present in the Pr2 (HIDDEN MENU) can be moved to th e Pr1 (user l evel) 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.
6.7 MANUALLY LOCK AND UNLOCK THE KEYBOARD
+
HOW TO LOCK THE KEYBOARD
1. Keep both UP+DOWN keys pressed more than 3 sec.
2. The “P oF” 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.
6.8 THE CONTINUOUS CYCLE
When defrost is no t active, a continuous cycle can be activated by keeping the UP key press ed for
about 3 sec. The compressor operates to maintain the CCS set point for the time set through the CCt
parameter. T he cycle can be term inated before the end of the set time by keeping the UP key
pressed 3 sec.
6.9 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 to the normally closed contacts of the relays are always
supplied and under voltage, even if the instrument is in stand by mode.
7. 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 to 25.5°C; 1 to 45°F) intervention differential for set point.
Compressor Cu t IN is S et Point + differ ential ( HY). Com pressor Cut OUT i s when th e
temperature reaches the set point.
LS
Minimum set point: (-55°C to SE T; -6 7°F to S ET) sets t he m ini mum v alu e for the s et
point.
US
Maximum set poin t: (SET to 15 0°C; SET to 302°F) set the maxim um value f or set
point.
ot
Thermostat probe calibration: (-12.0 to 12.0°C; -21 to 21°F) allows to adjust
possible offset of the thermos tat 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: (-1 2. 0 t o 12.0°C; -21 to 21°F) allows t o adjust possibl e
offset of the ev aporator probe.
P3P
Third probe presence (P3): (n; Y) n = not pr esent, the terminal s 18-20 operate as
digital input; Y = present, the terminals 18-20 operate as third probe.
o3
Third probe calibration (P3): (-12.0 to 12. 0°C ; -21 to 21°F) allow s to adjus t possi ble
offset of the third probe.
P4P
Fourth probe presence: (n; Y) n = Not present; Y = present.
NOTE: only for XW60LH models.
o4
Fourth probe calibration: (-12.0 to 1 2.0°C; -21 to 21°F) allows to adjus t possible
offset of the fourth probe.
NOTE: only for XW60LH models.
odS
Outputs activ ation delay at start up: (0 to 2 55min) this func tion is enabl ed at the
initial start up of the i nstr ument a nd inhi bits a ny outpu t acti vati on for th e peri od of tim e
set in the parameter.
AC
Anti-short cycl e delay: (0 to 50m in) mini mum interv al betwe en the compr essor stop
and the following restart.
rtr
Percentage of the second and fir st prob e for regulatio n: (0 to 100; 100=P 1, 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. 10min) allows
to set the len gth of the conti nuous cycle. C ompressor stays on without interr uption
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) it sets the set poi nt used
during the continuous cycle.
Con
Compressor ON time with faulty probe: (0 to 255min) time during which the
compressor i s active in case of faulty ther mostat probe. W ith Con=0 com pressor is
always OFF.
CoF
Compressor OFF time with faulty probe: (0 to 255min) time during which the
compressor i s OFF in case of faulty therm ostat probe. With CoF=0 compres sor is
always active.
1592036000 XW60LH GB r1.0 18.03.2015 XW60LH 2/6
Loading...