dixell XR50CX Installing And Operating Instructions - Page 2

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dIXEL

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

blinking).

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

blinking).

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

displayed immediately followed from the HY parameter.

NOW YOU ARE IN THE HIDDEN MENU.

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

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

The "POF" message will be displayed and the keyboard will be locked. At this point it will be

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

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

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.

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

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

point.

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

the thermostat probe.

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

stops by temperature.

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

the evaporator probe.

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

present:, the terminal operates as third probe.

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

the third probe.

P4P Fourth probe presence: (n = Not present; y = present).

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

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

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

following restart.

rtr

Percentage of the second and first probe for regulation (0÷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÷24.0h; res. 10min) Allows to set the

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.

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

cycle.

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

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

1592020050 XR50CX GB m&M r1.0 12.03.2007.doc

Installing and Operating Instructions

DISPLAY

CF Temperature measurement unit:

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;

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

tdF Defrost type: EL = electrical heater; in = hot gas;

dFP Probe selection for defrost termination: nP = no probe; P1 =thermostat probe; P2 =

evaporator probe; P3 =configurable probe; P4 = Probe on Hot Key plug.

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.

SECOND RELAY

tbA Alarm relay silencing (with oA1=ALr):

(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).

oA2 Second relay configuration: ALr: alarm; Lig: light; AuS: Auxiliary relay; onF: always on with

instrument on; db = do not select it; dEF: do not select it!.; FAn: do not select it!.; dF2: do not

select it.

AoP Alarm relay polarity: it set if the alarm relay is open or closed when an alarm happens. CL=

terminals 1-2 closed during an alarm; oP = terminals 1-2 open during an alarm

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.

XR50CX

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°C=Celsius; °F=Fahrenheit. WARNING: When the

dtr = percentage of

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