dixell WING XW272K Installing And Operating Instructions
Dixell
Installing and Operating Instructions
rel.1.0 –25/10/2000 - cod. 1592009540
1592009540 XW272K_full GB XW272K 1/5
WING
XW272K
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 differe nt from those descri bed hereunder. I t cannot be
used as a safety device.
• Check the application limits before proceeding.
1.2
SAFETY PRECAUTIONS
• Check the supply voltage is correct before conn ecting the instrument.
• Do not expose to water or moisture: use the control ler only withi n the oper ating limi ts avoiding s udden
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 f ault.
• Consider the maximum current which can be applied to each relay (see Technical Data).
• Ensure that the wires for probes, loads a nd th e pow er suppl y ar e separat ed and far enoug h from ea ch
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 XW272K is microprocessor ba sed controller suitabl e for application s on medium or low tem perature
refrigerating units. It must be connected by mean s of a two-wire cable (∅ 1mm) at a distance of u p to 30
meters to the keyboard T620. It is provided with six relay outputs to control two compressors, defrost - which
can be either electrical or hot gas - the evaporat or fans, the lights and the alarm. It i s also provided with
three NTC probe inputs, one for temp erature control, one to control the defrost e nd temperature of the
evaporator and the third, optional, for the display. There are two digital inputs (free contact) for the door
switch and configurable by parameter.
The standard TTL output allows the user to connect, by means of a TTL/RS485 external module, a
ModBUS-RTU compatible monitoring system and to programme the parameter list with the “Hot Key”. A
4÷20 mA output to control ev aporat or or conden ser f ans an d th e dire ct seri al out put RS485 are av ailable as
options.
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 whe n the temperature reaches the set point value again.
In case of fault in the thermostat probe the start and st op of the compressor are timed t hrough parameters
“COn” and “COF”.
3.2 SECOND COMPRESSOR
The second compressor is switched ON after a delay (AC1) of the first compressor activation. Compressors
can be switched ON always with the same sequence or in an alternate way.
CCO = Se : The first compressor is always switched on before the second one.
CCO = Al : The compressors are switched on in an alternate way.
3.3 FAST FREEZING
When defrost is not in progress, it can be acti vated the keypad by holding the è key pressed for about 3
seconds. The compressor operates in continuo us mode 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, è for about 3
seconds.
3.4 DEFROST
Three defrost modes are available through the “ tdF” parameter: defrost with electrical heater, hot gas or
thermostatic defrost. The defrost int erval is control by means of parameter “EdF”: (EdF=in) the defrost is
made every “IdF” time, (EdF=Sd) the interval “IdF” is calculate through Smart Defrost algorithm (only when
the compressor is ON and the evaporator temp erature is bigger than “SdF” parameter).
At the end of defrost the drip time is controlled thr ough the “Fdt” parameter.
3.5 CONTROL OF EVAPORATOR FANS
The fan control mode is selected by means of the “ FnC” parameter:
C-n = running with the compressor, OFF during the defrost;
C-y = running with the compressor, ON during the defrost;
O-n = continuous mode, OFF during the defrost;
O-y = continuous mode, ON during the defrost;
An additional parameter “FSt” provides the setting of temperat ure, detected by t he evaporator pro be, above
which the fans are always OFF. This can be use d to make sure circulation of air only if his temperature is
lower than set in “FSt”.
4. KEYBOARD
To display and modify target set point; in progra mming mode it selects a parameter or
confirm an operation.
By holding it pressed for 3s when max or min temperature is displayed it will be erased.
To see the max. stored temperature; in program ming 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 program ming mode it browses the parameter
codes or decreases the displayed value.
By holding it pressed for 3s the defrost i s 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.
4.1 USE OF LEDS
Each LED function is described in the following ta bl e.
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 als o present in “Pr1”
Function of the LEDs placed on the left top side of buttons:
BUTTON MODE FUNCTION
SET FLASHING The Set point is displayed and it can be modified
SET FAST FLASHING The Energy Saving is enabled
DEFROST ON The Manual Defrost is activated
LIGHT ON The Light is ON
ON/OFF ON The instrument is OFF
4.2 HOW TO SEE THE MIN TEMPERATURE
1.
Press and release the à key.
2.
The “Lo” message will be displayed followed by the minimum temperature recorded.
3.
By pressing the à key or waiting for 5s the normal display will be restored.
4.3 HOW TO SEE THE MAX TEMPERATURE
1.
Press and release the è key.
2. The “Hi” message will be displayed followed by the maximum temperature recorded.
3.
By pressing the è key or waiting for 5s the normal display will be restored.
4.4 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.
N.B. After the installation RESET the temperature stored .
Dixell
Installing and Operating Instructions
rel.1.0 –25/10/2000 - cod. 1592009540
1592009540 XW272K_full GB XW272K 2/5
4.5 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. The SET LED start blinking;
3. To change the Set value push the è or à arrows within 10s.
4. To memorise the new set point value push the SET key again or wait 10s.
4.6 TO START A MANUAL DEFROST
1. Push the DEF key for more than 2 seconds and a manual defrost will start.
4.7 TO ENTER IN PARAMETERS LIST “PR1”
To enter the parameter list “Pr1” (user accessible parameters) operate as follows:
1. Enter the Programming mode by pressing the Set and DOWN ke y
for few seconds (
and
start blinking).
2. The instrument will show the first parameter present in “Pr1”
4.8 TO ENTER IN PARAMETERS LIST “PR2”
To access parameters in “Pr2”:
1. Enter the “Pr1” level.
2. Select “Pr2” parameter and press t he “SET” key.
3. The “PAS” flashing message is displayed, shortly followed by “0 - -” with a flashing zero.
4. Use è or à to input the security code in the flashing digit; confirm the figure by pressing “SET”. The
security code is “321“.
5. If the security code is correct the access to “Pr2” is enabled by pressing “SET” on the last digit.
Another possibility is the following: after switching ON the instrument the user can push Set and DOWN keys
within 30 seconds.
NOTE: each parameter in “Pr2” can be removed or put i nto “P r1 ” ( user l ev el) by pres si ng “SET” + à. When
a parameter is present in “Pr1” LED
is on.
4.9 HOW TO CHANGE THE PARAMETER VALUE
1. Enter the Programming mode.
2. Select the required parameter with è or à.
3. Press the “SET” key to display its value (
and LED starts blinking).
4. Use è or à 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 15s without pressing a key.
NOTE: the new programming is stored even when the procedure is exited by waiting the time-out.
4.10 HOW TO LOCK THE KEYBOARD
1.
Keep the è and à keys pressed together for more than 3 s the è and à 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 th e MAX o Min temperature st ored and
to switch ON and OFF the light, the auxiliary output and the instrument.
TO UNLOCK THE KEYBOARD
Keep the è and à keys pressed together for more than 3s.
4.11 ON/OFF FUNCTION
By pushing the ON/OFF key, the instrument show s “OFF” fo r 5 sec. and t he ON/OFF LE D
is switched ON.
During the OFF status, all the relays are switc hed OFF and the reg ulations are st opped; if
a monitoring system is connected, it does not record the instrument data and alarms.
N.B. During the OFF status the Light and AUX buttons are active.
4.12 TO SEE THE PROBE VALUES
1.
Enter in “Pr2” level.
2.
Select “Prd” parameter with è or à.
3.
Press the “SET” key to display “Pb1” label alternate with Pb1 value.
4.
Use è and à keys to display the other probe values.
5.
Press “SET” to move to the following parameter.
5. PARAMETER LIST
REGULATION
Hy Differential: (0,1÷25,5°C; 1÷45°F): Intervention differential for set point, always positive. Compressor
Cut IN is Set Point Plus Differential (Hy). Compressor Cut OUT is when the temperature reaches the
set point.
LS Minimum set point limit: (-50,0°C
÷SET; -58°F÷SET) Sets the minimum acceptable value for t he set
point.
US Maximum set point limit: (SET
÷110°C; SET÷230°F) Set the maximum acceptable value for set
point.
OdS Outputs activation delay at start up: (0÷255 min) This function i s ena bled at the ini ti al st art up of t h e
instrument and inhibits any output activation for the period of time set in the parameter. (AUX and Light
can work)
CCO Compressors configuration : (Se,Al)
Se : The first compressor is always switched on before the second one.
Al : The compressors are switched on in an alternate way.
AC Anti-short cycle delay: (0÷30 min) interval between the compressor stop and the following restart.
AC1 Time delay between turning on compressor 1 and 2 : (0÷255 sec) allows to set the delay between
turning on the first and the second compressor.
CCt Thermostat override: (0min ÷23h 50min) allows to set the length of the continuou s cycle. Can be
used, for instance, when the room is filled with new products.
Con Compressor ON time with faulty probe: (0÷255 min) time duri ng which the compressor is active in
case of faulty thermostat probe. With COn=0 compressor is always OFF.
COF Compressor OFF time with faulty probe: (0÷255 min) time during which the compressor is off in
case of faulty thermostat probe. With COF=0 compressor is always active.
DISPLAY
CF Temperature measu rement unit: °C = Celsius; °F = Fahrenheit . When the measurement unit is
changed the SET point and the values of the regulation parameters have to be modified
rES Resolution (for °C): (in = 1°C; de = 0,1°C) allows decimal point display.
de = 0,1°C; in = 1 °C
Red Remote display : select which probe is displayed by the remote display (T620)
P1 = Thermostat probe; P2 = Evaporator probe; P3 = auxiliary probe;
1r2 = difference between P1 and P2 (P1-P2)
DEFROST
tdF Defrost type:
rE = electrical heater (Compressor OFF)
rT = thermostat defrost. During the defrost time “MdF”, the heater switches On and OFF depending on
the evaporator temperature and “dtE” value.
in = hot gas (Compressor and defrost relays ON)
EdF Defrost mode:
in = interval mode. The defrost starts when the time “Idf” is expired.
Sd = Smartfrost mode. The time IdF (interval between defrosts) is increased only when the
compressor is running (even non consecut ively ) a nd onl y if the evap orat or t empe ratu re is le ss t han t he
value in "SdF” (set point for SMARTFROST).
SdF Set point for SMARTFROST: (-30
÷30 °C/ -22÷86 °F) evaporator tempe rature which allows the I dF
counting (interval between defrosts) in SMARTFROST mode.
dtE Defrost termination temperature: (-50,0÷110,0°C; -58÷230°F) (Enabled only when the evaporator
probe is present) sets the temperatur e measured by the evaporator probe which causes the end of
defrost.
IdF Interval between defrosts: (1÷120h) Determines the time interval b etween the beginning of two
defrost cycles.
MdF (Maximum) duration of defrost: (0÷255 min) When P2P = n, no evaporator probe, it sets the defrost
duration, when P2P = y, defrost end based on temperat ure, it sets the maximum length for defrost.
dFd Display during defrost:
rt = real temperature; it = temperature reading at t he defrost start ; Set = set point; dEF = “dEF” label;
dEG = “dEG” label;
dAd Defrost display time out: (0
÷255 min) Sets the maximum time between the end of defrost and the
restarting of the real room temperature displ ay.
Fdt Drain down time: (0÷60 min.) time interval between reaching defrost termin ation temperature and the
restoring of the control’s normal op eration. This time allows the evapo rator to eliminate water drops
that might have formed due to defrost.
dPO First defrost after start-up:
y = Immediately; n = after the IdF time
dAF Defrost delay afte r fast freezin g: (0min÷23h 50 min) aft er a Fast F reezing cy cle, the f irst defr ost wil l
be delayed for this time.
FANS
FnC Fan operating mode:
C-n = running with the compressor, OFF during the defrost;
C-y = running with the compressor, ON during the defrost;
O-n = continuous mode, OFF during the defrost;
O-y = continuous mode, ON during the defrost;
Fnd Fan delay after defrost: (0÷255 min) The time interval between t he defrost end and evaporat or fans
start.
FSt Fan stop temperature: (-50÷110°C; -58÷230°F) setting of temperature, detected by evaporator
probe, above which the fan is always OFF.
ALARMS
ALC Temperature alarm configuration
rE = High and Low alarms related to Set Point
Ab = High and low alarms related to the absolute temperature.
ALU High temperature alarm setting:
ALC= rE, 0
÷ 50°C or 90°F
ALC= Ab, ALL
÷ 110°C or 230°F
when this temperature is reached and after the AL d delay time the HA alarm is enabled.
ALL Low temperature alarm setting:
ALC = rE , 0
÷ 50 °C or 90°F
ALC = Ab , - 50°C or -58°F
÷ ALU
when this temperature is reached and after the AL d delay time, the LA alarm is enabled,.
AFH Temperature alarm and fan differential: (0,1÷25,5°C; 1÷45°F) Intervention differential for
temperature alarm set point and fan regulation set point, always positive.
ALd Temperature alarm delay: (0÷255 min) time interval between the detection of an alarm condition and
the corresponding alarm signalling.
dAO Delay of temperature alarm at start-up: (0min÷23h 50min) time interval between the detection of the
temperature alarm condition after the instrum ent power on and the alarm signalling.
EdA Alarm delay at the end of defrost: (0
÷255 min) Time interval between the detection of the
temperature alarm condition at the end of defrost and the alarm signalling.
dot Delay of temperature alarm after closing the door : (0
÷255 min) Time delay to signal the
temperature alarm condition after closing the door.
doA Open door alarm delay:(0÷254min,nu) delay bet ween the detection of the open door conditi on and its
alarm signalling: the flashing message “dA” is displayed. If doA=nu the door alarm will be not
signalled.
nPS Pressure switch number: (0
÷15) Number of activation of the pressure switch, during the “did”
interval, before signalling the alarm event (I2F= PAL).
ANALOGUE OUTPUT 4÷20 mA (OPTIONAL)
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