Zero Zone XR40CX Installation Manual

dIXEL

Installing and Operating Instructions

Digital controller with defrost management

XR40CX

CONTENTS

1.

GENERAL WARNING ________________________________________________________ 1

2. GENERAL DESCRIPTION ____________________________________________________ 1

3. CONTROLLING LOADS ______________________________________________________1

4. FRONT PANEL COMMANDS __________________________________________________ 1

5. MAX & MIN TEMPERATURE MEMORIZATION____________________________________ 1

6. MAIN FUNCTIONS __________________________________________________________ 1

7. PARAMETERS _____________________________________________________________ 2

8. DIGITAL INPUT (ENABLED WITH P3P = N) ______________________________________ 3

9. TTL SERIAL LINE – FOR MONITORING SYSTEMS ________________________________ 3

10. X-REP OUTPUT – OPTIONAL _________________________________________________ 3

11. INSTALLATION AND MOUNTING ______________________________________________ 3

12. ELECTRICAL CONNECTIONS _________________________________________________ 3

13. HOW TO USE THE HOT KEY __________________________________________________ 3

14. ALARM SIGNALS ___________________________________________________________ 3

15. TECHNICAL DATA __________________________________________________________ 3

16. CONNECTIONS_____________________________________________________________ 4

17. DEFAULT SETTING VALUES __________________________________________________4

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

• 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

• 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

• 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

• In case of applications in industrial environments, the use of mains filters (our mod. FT1) in

2. GENERAL DESCRIPTION

Model XR40CX, format 32 x 74 mm, is microprocessor based controller, suitable for applications on
medium or low temperature refrigerating units. It has 2 relay outputs to control compressor and
defrost, which can be either electrical or reverse cycle (hot gas). It is also provided with three NTC or
PTC probe inputs, the first one for temperature control, the second one, to be located onto the
evaporator, to control the defrost termination temperature, the third one, optional, to connect to the
HOT KEY terminals to signal the condenser temperature alarm or to display a temperature. The
digital input can operate as fourth temperature probe.
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.

3. CONTROLLING LOADS

3.1 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”.

3.2 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).
At the end of defrost dripping time is started, its length is set in the FSt parameter. With FSt =0 the
dripping time is disabled.

SAFETY PRECAUTIONS

sudden temperature changes with high atmospheric humidity to prevent formation of
condensation

S.p.A.” (see address) with a detailed description of the fault.

from each other, without crossing or intertwining.

parallel with inductive loads could be useful.

Tem per.

SET

Time

Compr.

ON

1592020040

4. FRONT PANEL COMMANDS

: To display target set point; in programming mode it selects a parameter or confirm an

operation.

(DEF) To start a manual defrost

(UP): To see the max. stored temperature; in programming mode it browses the parameter

codes or increases the displayed value.

(DOWN) To see the min stored temperature; in programming mode it browses the parameter

codes or decreases the displayed value.

To switch the instrument off, if onF = oFF.

Not enabled.

KEY COMBINATIONS:

+

+ To enter in programming mode.
+ To return to the room temperature display.

To lock & unlock the keyboard.

4.1 USE OF LEDS

Each LED function is described in the following table.

LED MODE FUNCTION

ON Compressor enabled

Flashing Anti-short cycle delay enabled

ON Defrost enabled

Flashing Drip time in progress

ON An alarm is occurring

ON Continuous cycle is running

ON Energy saving enbled

°C/°F

ON Measurement unit

°C/°F

Flashing Programming phase

5. MAX & MIN TEMPERATURE MEMORIZATION

5.1 HOW TO SEE THE MIN TEMPERATURE

1. Press and release the n key.

2. The “Lo” message will be displayed followed by the minimum temperature recorded.

3. By pressing the n key again or by waiting 5s the normal display will be restored.

5.2 HOW TO SEE THE MAX TEMPERATURE

1. Press and release the o key.

2. The “Hi” message will be displayed followed by the maximum temperature recorded.

3. By pressing the o key again or by waiting 5s the normal display will be restored.

5.3 HOW TO RESET THE MAX AND MIN TEMPERATURE RECORDED

1. Hold press the SET key for more than 3s, while the max. or min temperature is displayed. (rSt
message will be displayed)

2. To confirm the operation the “rSt” message starts blinking and the normal temperature will be
displayed.

6. MAIN FUNCTIONS

6.1 HOW TO SEE THE SETPOINT

1. Push and immediately release the SET key: the display will show the
Set point value;

2. Push and immediately release the SET key or wait for 5 seconds to

display the probe value again.

6.2 HOW TO CHANGE THE SETPOINT

1. Push the SET key for more than 2 seconds to change the Set point value;

2. The value of the set point will be displayed and the “°C” or “°F” LED starts blinking;

3. To change the Set value push the o or n arrows within 10s.

4. To memorise the new set point value push the SET key again or wait 10s.

6.3 HOW TO START A MANUAL DEFROST

Push the DEF key for more than 2 seconds and a manual defrost will start.

6.4 HOW TO CHANGE A PARAMETER VALUE

To change the parameter’s value operate as follows:

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dIXEL

1. Enter the Programming mode by pressing the Set + n keys for 3s (the “°C” or “°F” LED starts

2. Select the required parameter. Press the “SET” key to display its value

3. Use “UP” or “DOWN” to change its value.

4. 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 set value is stored even when the procedure is exited by waiting the time-out to expire.

6.5 THE HIDDEN MENU

The hidden menu Includes all the parameters of the instrument.

6.5.1 HOW TO ENTER THE HIDDEN MENU

1. Enter the Programming mode by pressing the Set + n keys for 3s (the “°C” or “°F” LED starts

2. Released the keys, then push again the Set+n keys for more than 7s. The Pr2 label will be

3. Select the required parameter.

4. Press the “SET” key to display its value

5. Use o or n to change its value.

6. Press “SET” to store the new value and move to the following parameter.

To exit: Press SET + o or wait 15s without pressing a key.
NOTE1: if none parameter is present in Pr1, after 3s the “noP” message is displayed. 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.

6.5.2 HOW TO MOVE A PARAMETER FROM THE HIDDEN MENU TO THE
FIRST LEVEL AND VICEVERSA.

Each parameter present in the HIDDEN MENU can be removed or put into “THE FIRST LEVEL”
(user level) by pressing “SET + n”.
In HIDDEN MENU when a parameter is present in First Level the decimal point is on.

6.6 HOW TO LOCK THE KEYBOARD

1. Keep pressed for more than 3 s the UP + DOWN keys.

2. The “POF” message will be displayed and the keyboard will be locked. At this point it will be

3. If a key is pressed more than 3s the “POF” message will be displayed.

6.7 TO UNLOCK THE KEYBOARD

Keep pressed together for more than 3s the o and n keys, till the “Pon” message will be
displayed.

6.8 THE CONTINUOUS CYCLE

When defrost is not in progress, it can be activated by holding the “o” key pressed for about 3
seconds. 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
“o” for 3 seconds.

6.9 THE ON/OFF FUNCTION

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

REGULATION
Hy Differential: (0,1 ÷ 25,5°C / 1÷255 °F) Intervention differential for set point. Compressor Cut IN

LS Minimum set point: (- 50°C÷SET/-58°F÷SET): Sets the minimum value for the set point.
US Maximum set point: (SET÷110°C/ SET÷230°F). Set the maximum value for set point.
Ot Thermostat probe calibration: (-12.0÷12.0°C; -120÷120°F) allows to adjust possible offset of

P2P Evaporator probe presence: n= not present: the defrost stops by time; y= present: the defrost

OE Evaporator probe calibration: (-12.0÷12.0°C; -120÷120°F). allows to adjust possible offset of

P3P Third probe presence (P3): n= not present:, the terminal operates as digital input.; y=

O3 Third probe calibration (P3): (-12.0÷12.0°C; -120÷120°F). allows to adjust possible offset of

P4P Fourth probe presence: (n = Not present; y = present).
o4 Fourth probe calibration: (-12.0÷12.0°C) allows to adjust possible offset of the fourth probe.
OdS Outputs activation delay at start up: (0÷255min) This function is enabled at the initial start up

AC Anti-short cycle delay: (0÷50 min) minimum interval between the compressor stop and the

rtr Percentage of the second and first probe for regulation (0÷100; 100 = P1, 0 = P2 ): it

CCt Compressor ON time during continuous cycle: (0.0÷24.0h; res. 10min) Allows to set the

CCS Set point for continuous cycle: (-50÷150°C) it sets the set point used during the continuous

COn Compressor ON time with faulty probe: (0÷255 min) time during which the compressor is

COF Compressor OFF time with faulty probe: (0÷255 min) time during which the compressor is

1592020040 XR40CX GB m&M r1.1 05.03.2007.doc XR40C 2/4

blinking).

blinking).

displayed immediately followed from the HY parameter.
NOW YOU ARE IN THE HIDDEN MENU.

possible only to see the set point or the MAX o Min temperature stored

With “onF = oFF”, pushing the ON/OFF key, the instrument is switched off. The “OFF”
message is displayed. In this configuration, the regulation is disabled.
To switch the instrument on, push again the ON/OFF key.

is Set Point + differential (Hy). Compressor Cut OUT is when the temperature reaches the set
point.

the thermostat probe.

stops by temperature.

the evaporator probe.

present:, the terminal operates as third probe.

the third probe.

of the instrument and inhibits any output activation for the period of time set in the parameter.

following restart.

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).

length of the continuous cycle: compressor stays on without interruption for the CCt time. Can be
used, for instance, when the room is filled with new products.

cycle.

active in case of faulty thermostat probe. With COn=0 compressor is always OFF.

OFF in case of faulty thermostat probe. With COF=0 compressor is always active.

Installing and Operating Instructions

1592020040

DISPLAY
CF Temperature measurement unit: °C=Celsius; °F=Fahrenheit. WARNING: When the

measurement unit is changed the SET point and the values of the parameters Hy, LS, US, Ot,
ALU and ALL have to be checked and modified if necessary).

rES Resolution (for °C): (in = 1°C; dE = 0.1 °C) allows decimal point display.
Lod Instrument display: (P1; P2, P3, P4, SET, dtr): it selects which probe is displayed by the

instrument: P1 = Thermostat probe; P2 = Evaporator probe; P3 = Third probe(only for model
with this option enabled); P4 = Fourth probe, SET = set point; dtr = percentage of
visualization.

rEd X- REP display (optional): (P1; P2, P3, P4, SET, dtr): it selects which probe is displayed by

X- REP: P1 = Thermostat probe; P2 = Evaporator probe; P3 = Third probe(only for model with
this option enabled); P4 = Fourth probe, SET = set point; dtr = percentage of visualization.

dLy Display delay: (0 ÷20.0m; risul. 10s) when the temperature increases, the display is updated

of 1 °C/1°F after this time.

dtr Percentage of the second and first probe for visualization when Lod = dtr (0÷100; 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
dFP Probe selection for defrost termination: nP = no probe; P1 =thermostat probe; P2 =

evaporator probe; P3 =configurable probe; P4 = Probe on Hot Key plug.
tdF Defrost type: EL = electrical heater; in = hot gas
dtE Defrost termination temperature: (-50÷50 °C/

-58÷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÷120h) Determines the time interval between the

beginning of two defrost cycles.
MdF (Maximum) length for defrost: (0÷255min) When P2P = n, (not evaporator probe: timed

defrost) it sets the defrost duration, when P2P = y (defrost end based on temperature) it sets

the maximum length for defrost.
dSd Start defrost delay: ( 0÷99min) This is useful when different defrost start times are necessary

to avoid overloading the plant.
dFd Temperature displayed during defrost: (rt = real temperature; it = temperature at defrost

start; SEt = set point; dEF = “dEF” label)
dAd MAX display delay after defrost: (0÷255min). Sets the maximum time between the end of

defrost and the restarting of the real room temperature display.
Fdt Drip time: (0÷120 min) 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: (y = immediately; n = after the IdF time)
dAF Defrost delay after continuous cycle: (0÷23.5h) time interval between the end of the fast

freezing cycle and the following defrost related to it.

ALARMS
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: (SET÷110°C; SET÷230°F) when this temperature is reached

the alarm is enabled, after the “ALd” delay time.
ALL Minimum temperature alarm: (-50.0 ÷ SET°C; -58÷230°F when this temperature is reached

the alarm is enabled, after the “ALd” delay time.
AFH Differential for temperature alarm recovery: (0,1÷25,5°C; 1÷45°F) Intervention differential

for recovery of temperature alarm.
ALd Temperature alarm delay: (0÷255 min) time interval between the detection of an alarm

condition and alarm signalling.
dAO Exclusion of temperature alarm at startup: (from 0.0 min to 23.5h) time interval between the

detection of the temperature alarm condition after instrument power on and alarm signalling.

CONDENSER TEMPERATURE ALARM (detected by the fourth probe)
AP2 Probe selection for temperature alarm of condenser: nP = no probe; P1 =thermostat probe;

P2 = evaporator probe; P3 =configurable probe; P4 = Probe on Hot Key plug.
AL2 Low temperature alarm of condenser: (-55÷150°C) when this temperature is reached the

LA2 alarm is signalled, possibly after the Ad2 delay.
Au2 High temperature alarm of condenser: (-55÷150°C) when this temperature is reached the

HA2 alarm is signalled, possibly after the Ad2 delay.

AH2 Differential for temperature condenser alarm recovery: (0,1÷25,5°C; 1÷45°F)
Ad2 Condenser temperature alarm delay: (0÷255 min) time interval between the detection of the

condenser alarm condition and alarm signalling.

dA2 Condenser temperature alarm exclusion at start up: (from 0.0 min to 23.5h, res. 10min)
bLL Compressor off with low temperature alarm of condenser: n = no: compressor keeps on

working; Y = yes, 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 = no: compressor keeps on

working; Y = yes, compressor is switched off till the alarm is present, in any case regulation

restarts after AC time at minimum.

DIGITAL INPUT
i1P Digital input polarity: oP: the digital input is activated by opening the contact; CL: the digital

input is activated by closing the contact.
i1F Digital input configuration: 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 =not enabled; Htr = kind of

action inversion (cooling – heating); FAn = not set it; ES = Energy saving.
did: (0÷255 min) with i1F= EAL or i1F = bAL digital input alarm delay: delay between the

detection of the external alarm condition and its signalling.

with i1F= dor: door open signalling delay

with i1F = PAL: time for pressure switch function: time interval to calculate the number of

the pressure switch activation.
nPS Pressure switch number: (0

interval, before signalling the alarm event (I2F= PAL).

If the nPS activation in the did time is reached, switch off and on the instrument to

restart normal regulation.
odc Compressor status when open door: no; Fan = normal; CPr; F_C = Compressor OFF.
rrd Outputs restart after doA alarm: no = outputs not affected by the doA alarm; yES = outputs

restart with the doA alarm;

÷15) Number of activation of the pressure switch, during the “did”