Porkka F User manual

Rev. 201405
C &F
Technical and Service manual
Inventus upright refrigerators and freezers

2
Technical and Service manual
Porkka reserves the right to make product alterations at any time and can not be held responsible for any printing errors or omissions.
Inventus upright refrigerators and freezers
Contents
User manual - Control unit XW70K and D50K 4
Wiring diagram C 14
Wiring diagram F 15
Troubleshooting 16
Fan motor 20
Evaporator 21
Cleaning the condenser filter 22
Probes, P1 temperature probe 23
Probes, P2 defrost probe 24
Probes, P3 condenser probe 24
How to change the hinging of the solid door 26
EC-declaration of conformity for electrical equipment 30

3
Technical and Service manual
Porkka reserves the right to make product alterations at any time and can not be held responsible for any printing errors or omissions.
Inventus upright refrigerators and freezers

4
1598027800 XW70K GB PKK R1.0 10.12.2013doc.docx XW70K 1/6
XW70K AND D50K
1GENERAL 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.
Dixell Srl reserves the right to change the composition of its products, even without notice,
ensuring the same and unchanged functionality.
2GENERAL DESCRIPTION
Model XW70K is microprocessor based controller suitable for applications on medium or low
temperature refrigerating units. It has to be connected by means of a two-wire shielded twisted cable
(1mm) at a distance of up to 30 meters to the keyboard T620T or T620 or V620 or CX620. It is
provided with four relay outputs to control compressor, defrost - which can be either electrical or hot
gas - the evaporator fans and light. It is also provided with 4 NTC or PTC probe inputs, one for
temperature control, one to control the defrost end temperature of the evaporator and the third and
fourth to control condenser temperature or to display another temperature.
The HOT KEY output allows to connect 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 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.
3CONTROLLING 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 are 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
Two defrost modes are available through the “tdF” parameter: defrost through electrical heater (tdF =
EL) and hot gas defrost (tdF = in). Other parameters are used to control the interval between defrost
cycles (IdF), its maximum length (MdF) and two defrost modes: timed or controlled by the evaporator’s
probe (P2P).
Two defrost modes are available through the tdF parameter: defrost through electrical heater (tdF =
EL) and hot gas defrost (tdF = in).
A defrost starts after elapsing the idF time.
Other parameters are used to control defrost cycles: its maximum length (MdF) 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 Fdt parameter. With Fdt=0 the
dripping time is disabled.
3.4 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 duringdefrost;
FnC = o_n fans will run even if the compressor is off, and not runduring defrost;
After defrost, there is a timed fan delay allowing for drip time, set by means of the Fnd parameter.
FnC = C_Y fans will switch ON and OFF with the compressor and run duringdefrost;
FnC = o_Y fans will run continuously also during defrost.
An additional parameter FSt provides the setting of temperature, detected by the evaporator probe,
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.
3.4.1 Forced activation for fans
This function, managed by the FCt parameter, is designed to avoid short cycles of fans, that could
happen when the controller is switched on or after a defrost, when the room air warms the evaporator.
If the difference between the evaporator temperature and the room temperature is higher than the FCt
value, the controller will activate the fans. This function is disabled if FCt=0.
3.4.2 Timed activation of the fans when the compressor is off.
When FnC=C-n or C-Y (fans in parallel to the compressor), the fans will be able to carry out on and off
cycles even if the compressor is switched off. The on and off interval of time follow the Fon and FoF
parameters. When the compressor is stopped the fans will go on working for the Fon time. On the
other side, with Fon=0 the fans will stayalways off when the compressor is off.
4SPECIAL FUNCTIONS
By means of the parameter oA4 (28-29) it’s possible to configure the functions of the TRIAC output, as
described in the following paragraphs:
4.1 ON –OFF OUTPUT (DEAFALUT SETTING OA4 = ONF)
By setting oA4 =onF, the TRIAC will operate as “on-off”: it will be activated when the controller is
switched on and it will be switched off when the controller is in stand-by status.
4.2 LIGHT OUTPUT (OA4 = LIG)
By setting oA4=Lig the TRIAC will work as light, 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.
The parameter LHt (Light timer) sets the time the light will stay on after pressing the light switch on
the keyboard. Every time the key is pushed the timer is re-loaded.
4.3 SECOND COMPRESSOR MANAGEMENT (OA4 = CP2)
By setting oA4 =CP2, the correspondent TRIAC will operate as “second compressor”. It will be
activated in parallel with the first compressor, with a possible delay set in the AC1 parameter
(seconds). Both the compressors are switched off at the same time.
4.4 AUXILIARY OUTPUT (OA4 = AUS)
Bysetting oA4 =AUS, the TRIAC will work as auxiliary thermostat (ex. anti condensing heater).
Parameters involved:
-ACH (cL, Ht): Kind of regulation for the auxiliary output : Ht = heating / CL = cooling;
-SAA (-50÷150) Set point for auxiliary output
-SHy (0÷25.5°C) Differential for auxiliary output.
With ACH = CL: aux output cut in is SAA+SHy, cut out SAA.
With ACH = Ht: aux output cut in is SAA-SHy, cut out SAA.
-ArP (nP, P1, P2, P3, P4) Probe for auxiliary output
-Sdd (n, Y) Auxiliary output working during defrost
4.5 ALARM OUTPUT (OA4 = ALR)
By setting oA4 = ALr the correspondent output will work as alarm, it is switched on when an alarm
happens.
Parameters involved:
-tbA (n, y) Alarm output silencing
-AoP (cL; oP) Alarm output polarity
4.6 NEUTRAL ZONE (OA4 = DB)
By setting oA4 =db the controller will perform a
“neutral zone” regulation.
The heating element has to be connected to the
correspondent relay.
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 output
(heater) is switched on and then turned OFF
when the temperature reaches again the set
point.
Technical and Service manual
Porkka reserves the right to make product alterations at any time and can not be held responsible for any printing errors or omissions.
Inventus upright refrigerators and freezers
User manual - Control unit XW70K AND D50K

5
1598027800 XW70K GB PKK R1.0 10.12.2013doc.docx XW70K 2/6
5KEYBOARD
To display and modify target set point; in programming mode it selects a parameter
or confirm an operation. By holding it pressed for 3 sec
when max or min
temperature is displayed it will be erased.
(UP)
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.
(DOWN) To see the min stored tem
perature; in programming mode it browses the
parameter codes or decreases the displayed value.
(DEF) By holding it pressed for 3 sec the defrost is started.
(ONOFF) 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)
6CONTROLLER INTERFACE
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 or waiting for 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 temperature recorded.
3. By pressing the UP key or waiting for 5 sec the normal display will be restored.
6.3 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.
6.4 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.
6.5 TO START A MANUAL DEFROST
1. Push the DEF key for more than 2 sec and a manual defrost will start.
6.6 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 key
for few seconds ( and start blinking).
2. The instrument will show the first parameter present in “Pr1”
6.7 THE HIDDEN MENU
In the hidden menu there are all the parameters of the instrument.
6.7.1 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
bedisplayed immediately, followed from the HY parameter.
NOW THE HIDDEN MENU IS DISPLAYED
3. Select the required parameter.
4. Press SET keyto 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”messagewillbe displayed.
NOTE2: the new set value will be stored even if the procedure is exited by waiting for the time-out to
expire.
6.7.2 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.
6.7.3 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.
6.8 HOW TO LOCK THE KEYBOARD (MANUALLY)
+
1.
Keep the UP and DOWN keys pressed together for more than 3 sec the 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.
Technical and Service manual
Porkka reserves the right to make product alterations at any time and can not be held responsible for any printing errors or omissions.
Inventus upright refrigerators and freezers
User manual - Control unit XW70K AND D50K

6
1598027800 XW70K GB PKK R1.0 10.12.2013doc.docx XW70K 3/6
6.9 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.
6.10 TO SEE THE PROBE VALUES
1.
Enter in “Pr1” level.
2. Parameters “dP1”, “dP2”, “dP3” and “dP4” display the value of probes 1, 2, 3 and 4.
7PARAMETER LIST
REGULATION
HY Differential: (0.1 to 25.5°C; 1 to 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 to SET; -67°F to SET) sets the minimum value for the set
point.
US Maximum set point: (SET to 150°C; SET to 302°F) set the maximum value for set point.
ot Thermostat probe calibration: (-12.0 to 12.0°C; -21 to 21°F) allows to adjust possible
offset of the thermostat probe. Terminals 1-2.
P2P Second probe presence: (n; Y) n= not present, the defrost stops by time;
Y= present, the defrost stops by temperature. Terminals 2-3
oE Second probe calibration: (-12.0 to 12.0°C; -21 to 21°F) allows to adjust possible offset
of the second probe. Terminals 2-3.
P3P Third probe presence (P3): (n; Y) n= not present, Y= present. Terminals 4-5
o3 Third probe calibration (P3): (-12.0 to 12.0°C; -21 to 21°F) allows to adjust possible
offset of the third probe. Terminals 4-5
P4P Fourth probe presence: (n; Y) n = Not present; Y = present. Terminals 5-6
o4 Fourth probe calibration: (-12.0 to 12.0°C; -21 to 21°F) allows to adjust possible offset
of the fourth probe. Terminals 5-6
odS Outputs activation delay at start up: (0 to 255min) 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 to 50min) minimum interval between the compressor stop and
the following restart.
AC1 2
nd
compressor delay at start up (0÷255s) Used only with oA3 or oA4 = cP2 Time
interval between the switching on of the first compressor and the second one.
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. 10min) allows to
set the length of the continuous cycle. Compressor stays on without 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) it sets the set point used
during the continuous cycle.
Con Compressor ON time with faulty probe: (0 to 255min) time during 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 to 255min) time during which the
compressor is OFF 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 measurement unit is changed the SET point and the values of
the parameters related to the temperature have to be checked and modified (if
necessary).
rES Resolution (for °C): (in=1°C; dE=0.1°C) allows decimal point display.
rEd Probe display (P1; P2, P3, P4, SET, dtr) it selects which probe is displayed by the
controller. P1 = Thermostat probe; P2 = Second probe; P3 = Third probe; P4 = Fourth
probe, SET = set point;
dtr = percentage of visualization.
dLY Display delay: (0 to 20min00s; res. 10s) when the temperature increases, the display
is updated of 1°C or 1°F after this time.
dtr Percentage of the second and first probe for visualization 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 second probe, as for the following formula (dtr(P1-P2)/100 + P2).
DEFROST
tdF Defrost type: (EL; in) EL = electrical heater; in = hot gas.
dFP Probe selection for defrost termination: (nP; P1; P2; P3; P4) nP = no probe;
P1 =thermostat probe; P2 = Second probe; P3 =Third probe; P4 = Fourth Probe
dtE Defrost termination temperature: (-55 to 50°C; -67 to 122°F) (enabled only when
EdF=Pb) sets the temperature measured by the evaporator probe, which causes the
end of defrost.
idF Interval between defrost cycles: (0 to 120hours) determines the interval of time
between two defrost cycles.
MdF (Maximum) length for defrost: (0 to 255min) when P2P = nP, (not evaporator probe:
timed defrost) it sets the defrost duration. When P2P different from nP (defrost end
based on temperature) it sets the maximum length for defrost.
dSd Start defrost delay: (0 to 99min) this is useful when different defrost start times are
necessary to avoid overloading the plant.
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 defrost: (0 to 255min) sets the maximum time between the
end of defrost and the restarting of the real room temperature display.
Fdt Drip time: (0 to 120min) 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.
dPo First defrost after start-up: (n; Y)n= afterthe idF time, Y= immediately.
dAF Defrost delay after continuous cycle: (0.0 to 24h00min, res. 10min) time interval
between the end of the fast freezing cycle and the following defrost related to it.
FANS
FnC Fans operating mode: (C-n; o-n; C-Y; o-Y) C-n = runs with the compressor, OFF during
defrost; o-n = continuous mode, OFF during defrost; C-Y = runs with the compressor, ON
during defrost; o-Y = continuous mode, ON during defrost.
Fnd Fans delay after defrost: (0 to 255min) interval between end of defrost and evaporator
fans start.
FCt Temperature differential to avoid fan short cycles: (0 to 59°C; 0 to 90°F) (N.B.: FCt=0
means function disabled) if the difference of temperature between the evaporator and the
room probes is higher than FCt value, the fans will be switched on.
FSt Fans stop temperature: (-55 to 50°C; -67 to 122°F) setting of temperature, detected 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 the evaporator fan ON cycling time when the compressor is off. With
Fon=0 and FoF≠0the 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 activated in parallel with compressor) it sets the evaporator
fan off cycling time when the compressor is off.
With Fon=0 and FoF≠0the 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 = Second probe; P3 =Third probe; P4 =Fourth probe.
OA4 = AUS: AUXILIARY THERMOSTAT CONFIGURATION (terms. 28-29)
ACH Kind of regulation for auxiliary output: (Ht; CL) Ht = heating; CL = cooling.
SAA Set Point for auxiliary output: (-55.0 to 150.0°C; -67 to 302°F) it defines the room
temperature set point to switch auxiliary output.
SHY Differential for auxiliary output: (0.1 to 25.5°C; 1 to 45°F) intervention differential for
auxiliary output set point.
ACH=CL, AUX Cut in is [SAA+SHY]; AUX Cut outis SAA.
ACH=Ht, AUX Cut in is [SAA–SHY]; AUX Cut out is SAA.
ArP Probe selection for auxiliary: (nP; P1; P2; P3; P4) nP = no probe, the auxiliary output is
switched only by the digital input; P1 = Probe 1 (Thermostat probe); P2 = Probe 2; P3 =
Probe 3; P4 = Probe 4.
Sdd Auxiliary output off during defrost: (n; Y) n= the auxiliary output operates during
defrost.Y= the auxiliary output is switched off during defrost.
ALARMS
ALP Probe selection for alarm: (nP; P1; P2; P3; P4) nP = no probe, the temperature alarms
are disabled; P1 = Probe 1 (Thermostat probe); P2 = Probe 2; P3 = Probe 3; P4 = Fourth
probe.
ALC Temperature alarms configuration: (Ab; rE) Ab = absolute temperature, alarm
temperature is given by the ALL or ALU values. rE = temperature alarms are referred to
the set point. Temperature alarm is enabled when the temperature exceeds the
[SET+ALU] or[SET-ALL] values.
ALU MAXIMUM temperature alarm:
If ALC=Ab: [ALL to 150.0°C or ALL to 302°F]
If ALC=rE: [0.0 to 50.0°C or 0to 90°F]
when this temperature is reached the alarm is enabled, after the ALd delay time.
ALL Minimum temperature alarm:
If ALC=Ab: [-55°C to ALU;-67 to ALU]
If ALC=rE: [0.0 to 50.0°C or 0to 90°F]
when this temperature is reached the alarm is enabled, after the ALd delay time.
AFH Differential for temperature alarm recovery: (0.1 to 25.5°C; 1 to 45°F) intervention
differential for recovery of temperature alarm.
ALd Temperature alarm delay: (0 to 255 min) time interval between the detection of an alarm
condition and alarm signalling.
dot Temperature alarm delay, with door open: (0 to 255 min) time interval between the
detection of temperature alarm condition and alarm signaling with door open.
dAo Exclusion of temperature alarm at start-up: (0.0 to 24h00min, res. 10min) time interval
between the detection of the temperature alarm condition after instrument power on and
alarm signalling.
CONDENSER TEMPERATURE ALARM
AP2 Probe selection for temperature alarm of condenser: (nP; P1; P2; P3; P4)
nP = no probe; P1 = thermostat probe; P2 = second probe; P3 = Third probe; P4 = Fourth
probe.
AL2 Low temperature alarm of condenser: (-55 to 150°C; -67 to 302°F) when this
temperature is reached the LA2 alarm is signalled, possibly after the Ad2 delay.
Au2 High temperature alarm of condenser: (-55 to 150°C; -67 to 302°F) when this
temperature is reached the HA2 alarm is signalled, possiblyafter the Ad2 delay.
AH2 Differential for temperature condenser alarm recovery: 0.1 to 25.5°C; 1 to 45°F.
Ad2 Condenser temperature alarm delay: (0 to 255 min) time interval between the detection
of the condenser alarm condition and alarm signalling.
dA2 Condenser temperature alarm exclusion at start up: 0.0 to 24h00min, res. 10min.
bLL Compressor off with low temperature alarm of condenser: (n; Y) n= compressor
keeps on working; Y= compressor is switched off till the alarm is present, in any case
regulation restarts after AC time at minimum.
AC2 Compressor off with high temperature alarm of condenser: (n; Y) n= compressor
keeps on working; Y= compressor is switched off till the alarm is present, in any case
regulation restarts after AC time at minimum.
RELAY OA3 (22-23) CONFIGURATION
tbA Alarm relay silencing (with oAx =ALr): (n; Y) n= silencing disabled: alarm relay stays
on till alarm condition lasts. Y= silencing enabled: alarm relay is switched OFF by
pressing a key during an alarm.
oA4 TRIAN output configuration, terminals 28-29: (dEF; FAn; ALr; LiG; AUS; onF; db;
dEF2; HES) dEF = defrost; FAn = Fan; ALr = alarm; LiG = light; AUS = Auxiliary relay;
onF = always on with instrument on; db = neutral zone; dEF2 = do not select it; HES =
night blind.
Technical and Service manual
Porkka reserves the right to make product alterations at any time and can not be held responsible for any printing errors or omissions.
Inventus upright refrigerators and freezers
User manual - Control unit XW70K AND D50K

7
1598027800 XW70K GB PKK R1.0 10.12.2013doc.docx XW70K 4/6
AoP Alarm relay polarity: (CL; oP) it set if the alarm relay is open or closed when an alarm
occurs. CL = terminals closed during an alarm; oP = terminals open during an alarm.
DIGITAL INPUT
i1P First digital input polarity: (oP; CL) oP = the digital input is activated by opening the
contact; CL = the digital input is activated by closing the contact.
i1F First digital input configuration: (EAL; bAL; PAL; dor; dEF; ES; AUS; Htr; FAn; HdF;
onF; Sbt) EAL = external alarm: “EA” message is displayed; bAL = serious alarm “CA”
message is displayed; PAL = pressure switch alarm, “CA” message is displayed; dor =
door switch function; dEF = activation of a defrost cycle; AUS = auxiliary output activation
with oA4=AUS; Htr = type of inverting action (cooling or heating); FAn = fan; ES = energy
saving; HdF = Holiday defrost (enable only with RTC); onF = to switch the controller off;
LHt = to activate the light.
did Digital input 1 alarm delay: (0 to 255 min) delay between the detection of the external
alarm condition and its signalling.
When i1F= PAL, it is the interval of time to calculate the number of pressure switch
activation.
I2P Second digital input polarity: (oP; CL) oP = the digital input is activated by opening the
contact; CL = the digital input is activated by closing the contact.
I2F Second digital input configuration: (EAL; bAL; PAL;dor; dEF; ES; AUS; Htr; FAn; HdF;
onF; Sbt) EAL = external alarm: “EA” message is displayed; bAL = serious alarm “CA”
message is displayed; PAL = pressure switch alarm, “CA” message is displayed; dor =
door switch function; dEF = activation of a defrost cycle; AUS = auxiliary relay activation
with oA3=AUS; Htr = type of inverting action (cooling or heating); FAn = fan; ES = energy
saving; HdF = Holiday defrost (enable only with RTC); onF = to switch the controller off;
LHt = to activate the light.
d2d Digital input 2 alarm delay: (0 to 255 min) delay between the detection of the external
alarm condition and its signalling.
When i2F= PAL, it is the interval of time to calculate the number of pressure switch
activation.
nPS Number of pressure switch activation: (0 to 15) Number of activation, during the did or
d2d interval, before signalling an alarm event (i1F, i2F=PAL).
If the nPS activation during did or d2d time is reached, switch off and on the instrument to
restart normalregulation.
odC Compressor status when open door: (no; FAn; CPr;F_C;) no = normal;
FAn = normal; CPr = compressor OFF, F_C = compressor OFF.
rrd Outputs restart after door open alarm: (n; Y) n= outputs follow the odC parameter.
Y= outputs restart with a door open alarm.
LES Light off during Energy Saving status: n; Y.
HES Delta temperature during an Energy Saving cycle: (-30.0 to 30.0°C; -54 to 54°F) it
sets the increasing value of the set point [SET+HES] during the Energy Saving cycle.
OTHER
Adr Serial address: (1 to 247) identifies the instrument address when connected to a
ModBUS compatible monitoring system.
PbC Type of probe: (PtC; ntC) it allows to set the kind of probe used by the instrument:
-
PtC = PTC probe; ntC = NTC probe.
onF On/Off key enabling: (nU;oFF; ES)nU = disabled; oFF = enabled; ES = not set it.
dP1 Thermostat probe display.
dP2 Second probe display.
dP3 Third probe display.
dP4 Fourth probe display (only for XW60LT models).
rSE Real set point: it shows the set point used during the energy saving cycle or during the
continuous cycle.
rEL Software release for internal use.
Ptb Parameter table code: readable only.
8DIGITAL INPUT
The free voltage digital inputs are programmable in different configurations by the i1F or i2F
parameters.
8.1 DOOR SWITCH INPUT ( DOR)
It signals the door status and the corresponding relay output status through the odC parameter: no =
normal(anychange); Fan = Fan OFF; CPr = Compressor OFF; F_C = Compressor and fan OFF.
Since the door is opened, after the delay time set through parameter did, the door alarm is enabled,
the display shows the message “dA” and the regulation restarts is rtr = yES. The alarm stops as
soon as the external digital input is disabled again. With the door open, the high and low temperature
alarms are disabled.
8.2 GENERIC ALARM ( EAL)
As soon as the digital input is activated the unit will wait for did time delay before signalling the “EAL”
alarm message. The outputs status doesn’t change. The alarm stops just after the digital input is de-
activated.
8.3 SERIOUS ALARM MODE (BAL)
When the digital input is activated, the unit will wait for did delay before signalling the “CA” alarm
message. The relay outputs are switched OFF. The alarm will stop as soon as the digital input is de-
activated.
8.4 PRESSURE SWITCH (PAL)
If during the interval time set by did parameter, the pressure switch has reached the number of
activation of the nPS parameter, the “CA” pressure alarm message will be displayed. The compressor
and the regulation are stopped. When the digital input is ON the compressor is always OFF. If the
nPS activation in the did time is reached, switch off and on the instrument to restart normal
regulation.
8.5 AUXILIARY OUTPUT SWITCHING (AUS)
With oA1 or oA2 or oA3=AUS and i1F or i2F=AUX it switches the correspondent relay.
8.6 START DEFROST (I1F = DFR)
It starts a defrost if there are the right conditions. After the defrost is finished, the normal regulation will
restart only if the digital input is disabled otherwise the instrument will wait until the MdF safety time is
expired.
8.7 KIND OF ACTION: HEATING OR COOLING (I1F = HTR)
This function allows to invert the regulation of the controller: from cooling to heating and viceversa.
8.8 ENERGY SAVING (I1F = ES)
The Energy Saving function allows to change the set point value as the result of the SET+HES
(parameter) sum. This function is enabled until the digital input is activated.
8.9 DIGITAL INPUTS POLARITY
The digital input polarity depends on the i1P or i2P parameters:
i1P or i2P=CL: the input is activated by closing the contact.
i1P or i2P =OP: the input is activated by opening the contact
9INSTALLATION AND MOUNTING
D50K keyboard shall be mounted on vertical panel, and fixed using two columns according to the
following dimensions.
The controller XW70K shall bemounted ina din rail
It must be connected to the keyboard by means of a two-wire cable (1mm). The temperature range
allowed for correct operation is 0 to 60°C. Avoid places subject to strong vibrations, corrosive gases,
excessive dirt or humidity. The same recommendations apply to probes. Let the air circulate by the
cooling holes.
9.1 XW70K – 8 DIN CASE - DIMENSIONS
10 ELECTRICAL CONNECTIONS
XW70K is provided with screw terminal blocks to connect cables with a cross section up to 2.5 mm
2
for
the RS485 (optional) and the keyboard. To connect the other inputs, power supply and relays, XW70K
is provided with Faston connections (6.3mm). Heat-resistant cables have to be used. Before
connecting cables make sure the power supply complies with the instrument’s 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.
NOTE: the maximum current allowed for all the loads is 20A.
10.1 PROBE CONNECTIONS
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.
11 TTL/RS485 SERIAL LINE
The TTL connector allows, by means of the external module TTL/RS485 (XJ485CX), to connect the
unit to a network line ModBUS-RTU compatible as the dIXEL monitoring system. The same TTL
connector is used to upload and download the parameter list of the “HOT-KEY”.
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User manual - Control unit XW70K AND D50K

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1598027800 XW70K GB PKK R1.0 10.12.2013doc.docx XW70K 5/6
12 HOW TO: USE OF THE PROGRAMMING “HOT KEY”
12.1 PROGRAM A HOT-KEY FROM AN INSTRUMENT (UPLOAD)
1. Program one controller with the front keypad.
2. When the controller is ON, insert the “HOT-KEY” and push UP button; the “uPL”message
appears followed a by a flashing “End” label.
3. Push SET button and the “End” will stop flashing.
4. Turn OFF the instrument, remove the “HOT-KEY” and then turn it ON again.
NOTE: the “Err” message appears in case of a failed programming operation. In this case push again
button if you want to restart the upload again or remove the “HOT-KEY” to abort the operation.
12.2 PROGRAM AN INSTRUMENT BY USING A HOT-KEY (DOWNLOAD)
1. Turn OFF the instrument.
2. Insert a pre-programmed “HOT-KEY”into the 5-PIN receptacle and then turn the Controller
ON.
3. The parameter list of the “HOT-KEY” will be automatically downloaded into the Controller
memory. The “doL” message will blink followed a by a flashing “End” label.
4. After 10 seconds the instrument will restart working with the new parameters.
5. Remove the “HOT-KEY”.
NOTE: the message “Err” is displayed for failed programming. In this case turn the unit off and then on
if you want to restart the download again or remove the “HOT-KEY” to abort the operation.
13 ALARM SIGNALS
Message
Cause Outputs
P1 Thermostat probe failure
Alarm output ON; Compressor output according to
parameters Con and CoF.
P2 Second probe failure Alarm output ON; Other outputs unchanged
P3 Third probe failure Alarm output ON; Other outputs unchanged
P4 Fourth probe failure Alarm output ON; Other outputs unchanged
HA Maximum temperature alarm Alarm output ON; Other outputs unchanged
LA Minimum temperature alarm Alarm output ON; Other outputs unchanged
HA2 Condenser high temperature It depends on the AC2 parameter
LA2 Condenser low temperature It depends on the bLL parameter
dA Door open Compressor and fans restarts
EA External alarm Output unchanged.
CA Serious external alarm (i1F=bAL) All outputs OFF.
CA Pressure switch alarm (i1F=PAL) All outputs OFF
EE Data or memory failure Alarm output ON; Other outputs unchanged
noL No communication between base
and keyboard Unchanged
The alarm message is displayed until the alarm condition is recovery.
All the alarm messages are showed alternating with the room temperature except for the “P1” which is
flashing.
To reset the “EE” alarm and restart the normal functioning press any key, the “rSt” message is
displayed for about 3 sec.
13.1 SILENCING BUZZER
Once the alarm signal is detected the buzzer can be silenced by pressing any key. Buzzer is mounted
in the keyboard and it is an option.
13.2 “EE” ALARM
The dIXEL instruments are provided with an internal check for the data integrity. The “EE” alarm
flashes when a failure in the memory data occurs. In such cases the alarm output is enabled.
13.3 ALARM RECOVERY
Probe alarms: “P1” (probe1 faulty), “P2”, “P3” and “P4”; they automatically stop 10 sec after the probe
restarts normal operation. Check connections before replacing the probe.
Temperature alarms “HA”, “LA” “HA2” and “LA2” automatically stop as soon as the temperature
returns to normal values.
Alarms “EA” and “CA” (with i1F=bAL)recover as soon as the digital input is disabled.
Alarm “CA” (with i1F=PAL) recovers only by switching off and on the instrument.
14 Technical data
Keyboards
Housing: self extinguishing ABS
Case: open board: facia 35x86 mm; depth 9mm
Mounting: panel mounting
Protection: IP00;
Connections: pins connections type JST EHR-2
Power supply: from XW70K power module
Display: 3 digits, red LED, 18 mm high
Optional output: buzzer.
Power module XW70K
Case: 8 DN: 140X176X148
Connections: Screw terminal block
 2.5 mm
2
heat-resistant wiring and 6.3mm Faston
Power supply: 230Vac or. 110Vac
 10% or 24Vac
Power absorption: 10VA max
Inputs: 4 NTC or PTC probes
Digital inputs: 1 free voltage
Relay outputs: Total current on loads MAX. 20A
Compressor/Valve: relay SPST 8(3) A, 250Vac
Fan: relay SPST 16(5) A, 250Vac
Defrost: relay SPST 20(8) A, 250Vac
Light : relay SPST 16(5) A, 250Vac
On/off : TRIAC 2A max, 250Vac
Serial output: TTL standard
Communication protocol: Modbus - RTU
Data storing: on the non-volatile memory (EEPROM)
Kind of action: 1B
Pollution degree: normal
Software class: A
Operating temperature: 0 to 60°C (32 to 140°F)
Storage temperature: -25 to 60°C (-13 to 140°F)
Relative humidity: 20 to 85% (no condensing)
Measuring and regulation range:
NTC probe: -40 to 110°C (-58 to 230°F)
PTC probe: -50 to 150°C (-58 to 302°F)
Resolution: 0.1°C or 1°C or 1°F (selectable)
Accuracy (ambient temp. 25°C): ±0.5°C ±1 digit
15 CONNECTIONS
15.1 XW70K
16 Default setting values
Label
Name Range Default
Level
REGULATION
SEt Set point LS; US -5.0 - - -
Hy Differential [0.1 to 25.5°C]
[1 to 45°F] 2.0 Pr1
LS Minimum set point [-55.0°C to SET]
[-67°F to SET] -50.0
Pr2
US Maximum set point [SET to 150°C]
[SET to 302°F] 110 Pr2
ot Thermostat probe calibration [-12 to 12°C]
[-21 to 21°F] 0.0 Pr1
P2P Second probe presence n=not present; Y=pres. Y Pr1
oE Second probe calibration [-12 to 12°C]
[-21 to 21°F] 0.0 Pr2
P3P Third probe presence n=not present; Y=pres. n Pr2
o3 Third probe calibration [-12 to 12°C]
[-21 to 21°F] 0 Pr2
P4P Fourth probe presence n=not present; Y=pres. n Pr2
o4 Fourth probe calibration [-12 to 12°C]
[-21 to 21°F] 0 Pr2
odS Outputs activation delay at start
up 0 to 255 min 0 Pr2
AC Anti-short cycle delay 0 to 30 min 1 Pr1
Ac1 Second compressor delay 0 to 255 sec 5 Pr2
rtr P1-P2 percentage for regulation 0 to 100 (100=P1 , 0=P2) 100 Pr2
CCt Compressor ON time during fast
freezing 0.0 to 23h50min, res. 10 min 0.0 Pr2
CCS Set point for continuous cycle [-55.0 to 150.0°C]
[-67 to 302°F] -5 Pr2
Con Compressor ON time with faulty
probe 0 to 255 min 15 Pr2
CoF Compressor OFF time with faulty
probe 0 to 255 min 30 Pr2
DISPLAY
CF Temperature measurement unit °C; °F °C Pr2
rES Resolution (integer/decimal point)
in; dE dE Pr1
rEd Remote display P1; dtr P1 Pr2
dLy Display temperature delay 0.0 to 20min00sec, res. 10 sec 0 Pr2
dtr P1-P2 percentage for disply 1; 100 50 Pr2
DEFROST
tdF Defrost type EL; in EL Pr1
dFP Probe selection for defrost
termination nP; P1; P2; P3;P4 P2 Pr2
dtE Defrost termination temperature [-50.0 to 150°C]
[-58 to 302°F] 8.0 Pr1
idF Interval between defrost cycles 1 to 120 h 6 Pr1
MdF (Maximum) length for 1° defrost 0 to 255 min 30 Pr1
dSd Startdefrostdelay 0 to 99 min 0 Pr2
dFd Displaying during defrost rt; it; SEt;dEF; dEG it Pr2
dAd MAX display delay after defrost 0 to 255 min 30 Pr2
Fdt Draining time 0 to 60 min 0 Pr2
dPo First defrost after start up n; Y n Pr2
dAF Defrost delayafter fast freezing 0.0 to 23h50min, res. 10 min 0.0 Pr2
FANS
FnC Fans operating mode C-n; C-y; O-n; O-y o-n Pr1
Fnd Fans delay after defrost 0 to 255 min 10 Pr1
FCt Differential of temperature for
forced activation of fans [0 to 50°C] [0 to 90°F] 10 Pr2
FSt Fans stop temperature [-55.0 to 50°C]
[-67 to 302°F] 2 Pr1
Fon Fan on time with compressor off 0 to 15 min 0 Pr2
FoF Fan off time with compressor off 0 to 15 min 0 Pr2
FAP Probe selection for fan
management nP; P1; P2; P3;P4 P2 Pr2
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Inventus upright refrigerators and freezers
User manual - Control unit XW70K AND D50K

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1598027800 XW70K GB PKK R1.0 10.12.2013doc.docx XW70K 6/6
Label
Name Range Default
Level
AUXILIARY THERMOSTAT
ACH
Kind of action for auxiliary relay CL; Ht Ht Pr2
SAA
Set Point for auxiliary relay [-55.0 to 150°C]
[-67 to 302°F] 5 Pr2
SHy Differential for auxiliary relay [0.1 to 25.5°C]
[1 to 45°F] 2 Pr2
ArP Probe selection for auxiliary relay nP; P1; P2; P3 nP Pr2
Sdd Aux.output working during defrost
n; Y no Pr2
ALARMS
ALP Probe setting for temperature
alarm P1; P2; P3; P4 P1 Pr2
ALC
Temperature alarms configuration
rE; Ab Ab Pr2
ALU
MAXIMUM temperature alarm [-55.0 to 150.0°C]
[-67 to 302°F] 110,0
Pr1
ALL minimum temperature alarm [-55.0 to 150.0°C]
[-67 to 302°F] -50,0
Pr1
AFH
Temperature alarm and fan
differential [0.1 to 25.5°C] [1 to 45°F] 2,0 Pr2
ALd Temperature alarm delay 0 to 255 min 15 Pr2
dot Temperature alarm delay with
door open 0 to 255 min 15 Pr2
dAo Delay of temperature alarm at
start up 0.0 to 23h50min, res. 10 min 1,3 Pr2
AP2 Probe for temperat. alarm of
condenser nP; P1; P2; P3;P4 P4 Pr2
AL2 Condenser for low temperat.
alarm [-55.0 to 150.0°C] [-67 to 302°F] -40 Pr2
AU2 Condenser for high temperat.
alarm [-55.0 to 150.0°C] [-67 to 302°F] 110 Pr2
AH2 Differentialfor condenser
temperature alarm recovery [0.1 to 25.5°C] [1 to 45°F] 5 Pr2
Ad2 Condenser temperature alarm
delay 0 to 254 min , 255=nU 15 Pr2
dA2 Delay of cond. temper. alarm at
start up 0.0 to 23h50min, res. 10 min 1,3 Pr2
bLL Compressor off because of
condenser low temperature alarm
n(0); Y(1) n Pr2
AC2 Compr. off for condenser high
temperature alarm n(0); Y(1) n Pr2
AUXILIARY OUTPUT
tbA Alarm relay disabling n=no; Y=yes y Pr2
buM
Buzzer silencing n(0); Y(1) yes Pr2
oA4 TRIAC configuration (28-29)
ALr = alarm; dEF = do not select it; Lig
=Light; AUS =AUX; onF=always on; Fan=
do not select it; db =do not select it; dF2 =
do not select it
onF Pr2
AoP Alarm relay polarity (oA4=ALr) oP; CL CL Pr2
DIGITAL INPUT
i1P Digital input polarity oP=opening;CL=closing cL Pr1
i1F Digital input configuration EAL; bAL; PAL; dor; dEF; Htr; AUS dor Pr1
did Digital input alarm delay 0 to 255 min 5 Pr1
i2b Second Digital input on base n , y CL Pr1
i2P Digital input polarity oP=opening;CL=closing EAL Pr1
i2F Digital input configuration EAL; bAL; PAL; dor; dEF; Htr; AUS 0 Pr1
d2d Digital input alarm delay 0 to 255 min 15 Pr2
nPS Number of activation of pressure
switch 0 to 15 F-C Pr2
odC Compress and fan status when
open door no; FAn; CPr; F_C yes Pr2
rrd Regulation restart with door open
alarm n; Y no Pr2
LES Light off during energy saving
status n; Y 0 Pr2
HES
Differential for Energy Saving [-30 to 30°C]
[-54 to 54°F] 0 Pr2
OTHER
Adr Serial address 1 to 247 1 Pr1
PbC Kind of probe PtC; ntC ntC Pr2
onF on/off key enabling nu, oFF; ES oFF Pr2
dP1 Room probe display read only - Pr1
dP2 Second probe display read only - Pr1
dP3 Third probe display read only - Pr1
dP4 Fourth probe display read only - Pr1
rSE Current set point read only Pr1
rEL Software release read only 9.4 Pr2
Ptb Map code read only - Pr2
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Inventus upright refrigerators and freezers
User manual - Control unit XW70K AND D50K

10
Koodi/Edit
2
2
12
0
yes
0
yes
0
no
0
1
3
5
100
0.00
0
3
20
°C
in
P1
1.00
50
EL
P2
6
12
25
0
dEF
20
0
no
0.00
O_Y
0
10
30
0
0
P2
CL
28
2
P3
no
Technical and Service manual
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Inventus upright refrigerators and freezers
Group Parameter Description
Regulation Hy Differential
Regulation LS Minimum set point
Regulation US Maximum set point
Probes ot Air temperature probe calibration
Probes P2P Evaporator (defrost) probe presence
Probes oE Evaporator (defrost) probe calibration
Probes P3P Condenser probe presence
Probes o3 Condenser probe calibration
Probes P4P Fourth probe presence (not in use)
Probes o4 Fourth probe calibration (not in use)
Regulation odS Delay at start up
Regulation AC Anti-short cycle delay
Regulation AC1 Second compressor start delay (not in use)
Regulation rtr P1-P2 percentage for regulation (not in use)
Regulation CCt Continuous cycle duration (not in use)
Regulation CCS Set point for continuous cycle (not in use)
Regulation Con Compressor ON time with faulty probe
Regulation CoF Compressor OFF time with faulty probe
Regulation CF Temperature measurement unit
Regulation rES Resolution
Regulation rEd Probe for Temperature display
Regulation dLy Display temperature delay
Regulation dtr P1-P2 percentage for display (not in use)
Defrost tdF Defrost type
Defrost dFP Probe selection for defrost
Defrost dtE Defrost termination temperature
Defrost idF Interval between defrost cycles
Defrost MdF Maximum time for defrost
Defrost dSd Start defrost delay
Defrost dFd Display during defrost shows
Defrost dAd Display delay after defrost
Defrost Fdt Draining time
Defrost dPo First defrost after start-up (not in use)
Defrost dAF Defrost delay after fast freezing (not in use)
Fan FnC Evaporator fan operating mode
Fan Fnd Fan delay after defrost
Fan FCt Differential of temperature for forced activation of fans (not in use)
Fan FSt Evaporator fan stop temperature
Fan Fon Evaporator fan on time with compressor off (not in use)
Fan FoF Evaporator fan off time with compressor off (not in use)
Fan FAP Probe selection for evaporator fan
Auxiliary ACH Kind of action for condenser fan (auxiliary relay)
Auxiliary SAA Set point for condenser fan (auxiliary relay)
Auxiliary SHy Differential for condenser fan (auxiliary relay)
Auxiliary ArP Probe selection condenser fan (auxiliary relay)
Auxiliary Sdd condenser fan (auxiliary relay) switched off during defrost
Parameters C