dixell XW20K, T620, T620T, V620 Installing And Operating Insructions
1592026000 XW20K GB R2.0 08.06.2011.doc XW60K 1/5
XW20K AND T620T - T620 – V620 – CX620
1 GENERAL WARNING ......................................................................................................... 1
2 GENERAL DESCRIPTION .................................................................................................. 1
3 CONTROLLING LOADS ...................................................................................................... 1
4 SPECIAL FUNCTIONS................................................................ ........................................ 1
5 KEYBOARDS...................................................................................................................... 1
6 AUTOMATIC KEYBOARD LOCK (ONLY FOR T620T) ......................................................... 2
7 CONTROLLER INTERFACE ............................................................................................... 2
8 PARAMETER LIST ............................................................................................................. 2
9 DIGITAL INPUT .................................................................................................................. 3
10 INSTALLATION AND MOUNTING ................................ ....................................................... 4
11 ELECTRICAL CONNECTIONS............................................................................................ 4
12 TTL/RS485 SERIAL LINE .................................................................................................... 4
13 HOW TO: USE OF THE PROGRAMMING “HOT KEY” ......................................................... 4
14 ALARM SIGNALS ............................................................................................................... 4
15 TECHNICAL DATA ............................................................................................................. 4
16 CONNECTIONS................................................................ .................................................. 4
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.
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.r. l.”
(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 XW20K is microprocessor based controller suitable for applications on normal or medium
temperature refrigerating units. It has to be connected by me ans of a two-wir e cable ( 1mm) at a
distance of up to 30 meters to the keyboard T620T, T620, V620 or CX620.
It is provided with two relay outputs to control compressor and light. It is also provided with 3 NTC or
PTC probe inputs, one for temperature control, one to control the defrost end temperature of the
evaporator and the third to control condenser temperature or to display another temperature.
The HOT-KEY output allows to connect the unit, by me ans of the external module XJ485-CX, to a
network line ModBUS-RTU compatible such as a dIXEL monitoring u nits of X-WEB family. It allows
to program 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 THE COMPRESSOR
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 Con and CoF.
The relay of the second compressor is activated in parallel with the relay of the first compressor, with a
possible delay set in the AC1 parameter. Both the compressors ar e switched off at the same time.
3.2 FAST FREEZING
When defrost is not in progress, it can be activated by holding the UP key pressed for about 3 sec.
The compressor operates to maintain the CCS set point for the time set through the CCt parameter.
The cycle can be terminated before the end of the set time using the same activation key UP for 3 sec.
3.3 DEFROST
Defrost is performed through a simple stop of the compressor. The parameters involved are: i dF, to
control the interval between defrost cycles and MdF, which is the maximum defrost length. There are
also two defrost modes: timed or controlled by the evaporator’s probe (p arameter dFP and P3P). At
the end of a defrost cycle a d ripping time is started; its length is set in the FSt parameter. With FSt=0
the dripping time is disabled.
4 SPECIAL FUNCTIONS
By means of the parameter oA3, it’s possible to configure the functions of the light relay (22-23), as
described in the following paragraphs:
4.1 OA3 = LIG: LIGHT RELAY (FACTORY SETTING)
By setting oA3=Lig the relay will work as light relay, it is switched on and off by the light button on the
keyboard and is affected by status of the digital input when i1F=dor.
4.2 OA3 = CP2 SECOND COMPRESSOR MANAGEMENT
By setting oA3=CP2, the relay at terminals 22-23 will operate as “second compressor”. It will be
activated in parallel with the relay of the first compressor, with a possible delay set in the AC1
parameter (seconds). Both the compressors are switched off at the same time.
4.3 OA3 = ONF: ON –OFF RELAY
By setting oA3=onF, the relay will operate as “on-off” relay: it will be activated when the controller is
switched on and it will be switched off when the controller is in stand-by status.
4.4 OA3 = AUS: AUXILIARY RELAY
By setting oA3=AUS, the relay 22-23 will work as auxiliary thermostat (ex. anti condensing heater).
Parameters involved:
- ACH (cL, Ht): Kind of regulation for the auxiliary relay: Ht = heating / CL = cooling;
- SAA (-50÷150) Set point for auxiliary relay
- SHy (0÷25.5°C) Differential for auxiliary output.
With ACH = CL: aux relay cut in is SAA+SHy, cut out SAA.
With ACH = Ht: aux relay cut in is SAA-SHy, cut out SAA.
- ArP (nP, P1, P2, P3, P4) Probe for auxiliary relay
- Sdd (n, Y) Auxiliary output working during defrost
4.5 OA3 = ALR: ALARM RELAY
By setting oA3=ALr the relay will work as alarm relay, it is switched on when an alarm happens.
Parameters involved:
- tbA (n, y) Alarm relay silencing
- AoP (cL; oP) Alarm relay polarity
4.6 OA3 = DB: NEUTRAL ZONE
By setting oA3=db the controller will perform a
“neutral zone” regulation.
The heating e lement has to be connected to the
oA3 relay (22-23)
If the temperature increases and reaches set
point plus differential (HY) the compressor is
started and then turned off when the
temperature reaches the set point value again.
If the temperature decreases and reaches the
set point minus differential (HY) the oA3 output
(heater) is switched on and then turned OFF
when the temperature reaches again the set
point.
5 KEYBOARDS
T620T
T620
V620
CX620
To display and modify target set point; in programming mode it se lects a parameter
or confirm an operation. By holding it pressed for 3 sec when max or min
temperature is displayed it will be erased.
To see the max stored temperature; in programming mode it browses the
parameter codes or increases the displayed value.
By holding it pressed for 3s the fast freezing cycle is started.
To see the min stored temperature; in programming mode it browses the parameter
codes or decreases the displayed value.
1592026000 XW20K GB R2.0 08.06.2011.doc XW60K 2/5
By holding it pressed for 3 sec the defrost is started.
Switch ON and OFF the cold room light.
Switch ON and OFF the instrument.
KEY COMBINATIONS
+
To lock and unlock the keyboard.
+
To enter the programming mode.
+
To exit the programming mode.
5.1 USE OF LEDS
Each LED function is described in the following table.
LED MODE Function
ON The compressor is running
FLASHING
- Programming Phase (flashing with LED )
- Anti-short cycle delay enabled
ON The fan is running
FLASHING
Programming Phase (flashing with LED )
ON The defrost is enabled
FLASHING Drip time in progress
ON The Fast Freezing cycle is enabled
ON
- ALARM signal
- In “Pr2” indicates that the parameter is also present in “Pr1”
ON Continuous cycle is running
ON Energy saving enabled
ON Light on
ON Auxiliary relay on (CX620 only)
°C/°F ON Measurement unit (CX620 only)
6 AUTOMATIC KEYBOARD LOCK (ONLY FOR T620T)
To avoid accidental modifications of the controller settings, the T620T keyboard will be locked
automatically if no key will be touched for 60 seconds. The T620T will show “LoC” flashing for few
seconds when it’s locking. The light key is operating even if the keyboard is locked.
6.1 TO UNLOCK THE T620T
1. Touch any key.
2. The keys will be lighted.
3. Keep a key pushed for few seconds till the “on” message is displayed.
7 CONTROLLER INTERFACE
7.1 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 or waiting for 5 sec the normal display will be restored.
7.2 HOW TO SEE THE MAX TEMPERATURE
1.
Press and release the UP key.
2. The “Hi” message will be displayed followed by the maximum temperature recorded.
3. By pressing the UP key or waiting for 5 sec the normal display will be restored.
7.3 HOW TO RESET THE MAX AND MIN TEMPERATURE RECORDED
To reset the stored temperature, when max or min temperature is displayed:
1. Press SET key until “rST” label starts blinking.
Note: after the installation remember to RESET the temperature stored.
7.4 HOW TO SEE AND MODIFY THE SET POINT
1. Push and immediately release the SET key: the display will show the Set point value;
2. To change the SEt value, push the UP or DOWN arrows within 10 sec.
3. To memorise the new set point value push the SET key again or wait for 10 sec.
7.5 TO START A MANUAL DEFROST
1. Push the DEF key for more than 2 sec and a manual defrost will start.
7.6 TO ENTER IN PARAMETERS LIST “PR1”
To enter the parameter list “Pr1” (user accessible parameters) o perate as follows:
+
1. Enter the Programming mode by pressing the Set and DOWN key for
few seconds ( and start blinking).
2. The instrument will show the first parameter present in “Pr1”
7.7 THE HIDDEN MENU
In the hidden menu there are all the parameters of the instrument.
7.7.1 ENTERING THE HIDDEN MENU
1. Enter the Programming mode by pressing the SET+DOWN keys for 3 sec (the “°C” or “°F” LED will
start blinking).
2. Release the keys and then push again the SET+DOWN keys more than 7 sec. The “Pr2” label will
be displayed immediately, followed from the HY parameter.
NOW THE HIDDEN MENU IS DISPLAYED
3. Select the required parameter.
4. Press SET key to display its actual 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 or wait for 15 sec without pressing any key.
NOTE1: if no parameter is present in the “Pr1” level, after the first 3 sec the “noP” message will be
displayed. Keep SET+DOWN keys pushed till the “Pr2” message will be displayed.
NOTE2: the new set value will be stored even if the procedure is exited by waiting for the time-out to
expire.
7.7.2 HOW TO: MOVE A PARAMETER FROM THE HIDDEN MENU TO THE FIRST LEVEL AND
VICEVERSA.
Each parameter present in the HIDDEN MENU can be moved or put into “THE FIRST LEVEL” (user
level) by pressing SET+DOWN keys. In HIDDEN MENU, if a parameter is present also in the First
Level (Pr1), the decimal point will be lit.
7.7.3 HOW TO CHANGE THE PARAMETER VALUE
1. Enter the Programming mode.
2. Select the required parameter with UP or DOWN.
3. Press the “SET” key to display its value ( and LED starts blinking).
4. Use UP or DOWN to change its value.
5. Press SET to store the new value and move to the following parameter.
To exit: Press SET+UP or wait for 15 sec without pressing any key.
NOTE: the new programming is stored even when the procedure is exited by waiting the time-out.
7.8 HOW TO LOCK THE KEYBOARD (MANUALLY)
+
1.
Keep the UP and DOWN keys pressed together for more than 3 sec th e UP and
DOWN keys.
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.
TO UNLOCK THE KEYBOARD
Keep the UP and DOWN keys pressed together for more than 3 sec.
7.9 ON/OFF FUNCTION (STAND BY)
By pushing the ON/OFF key, the instrument shows “OFF” for 5 sec. and the ON/OFF LED
is switched ON.
During the OFF status, all the relays are switched OFF and the regulations are stopped; if
a monitoring system is connected, it does not record the instrument data and alarms.
When the instrument is in stand by the keyboard displays “oFF”.
N.B. During the OFF status the Light and AUX buttons are active.
1.1 TO SEE THE PROBE VALUES
1.
Enter in “Pr1” level.
2. Parameters “dP1”, “dP3” and “dP4” display the value of probes 1, 3 and 4.
8 PARAMETER LIST
REGULATION
Hy Differential: (0.1 to 25.5°C; 1 to 45°F) differential for set p oint, always positive. Compressor Cut
IN is Set Point p lus Differential (HY). Compress or Cut OUT is when the temperature reaches the
set point.
LS Minimum set point limit: (-55.0°C to SET; -67°F to SET) Sets the minimum acceptable value
for the set point.
US Maximum set point limit: (SET to 150°C; SET to 302°F) Set the maximum acceptable value for
set point.
PROBE INPUTS
ot Thermostat probe calibration (term. 1-2): (-12.0 to 12.0°C; -21 to 21°F) allows to adjust
possible offset of the thermostat probe.
P3P Third probe presence (term. 4-5): n= not present; y= present.
o3 Third probe calibration: (-12.0 to 12.0°C; -21 to 21°F) allows to adjust possible offsets of the
third probe.
P4P Fourth probe presence (term. 5-6): n= not present; y= present.
o4 Fourth probe calibration: (-12.0 to 12.0°C; -21 to 21°F) allows to adjust possible offsets of the
fourth probe.
odS Outputs activation delay at start up: (0 to 255 min) 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.
(AUX and Light can work)
AC Anti-short cycle delay: (0 to 30 min) inter val between the com pressor stop and the following
restart.
AC1 Time delay between turning on compressor 2: (0 to 255 sec) allows to set the delay between
turning on the first and the second compressor. It’s used with oA3=CP2.
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