dixell XR70CX User Manual

1592020070 XR70CX GB m&M r1.3 08.05.2012.doc XR70CX 2/5
3. By pressing the UP key again or by waiting 5 sec the normal display will be restored.
5.3 HOW TO: RESET THE MAX AND MIN TEMPERATURE RECORDED
1. Keep the SET key pressed more than 3 sec, while the max or min temperature is displayed.
(“rSt” message will be displayed)
2. To confirm the operation the “rSt” message will start blinking and the normal temperature will be
displayed.
6. MAIN FUNCTIONS
6.1 HOW TO: SEE THE SET POINT
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 sec to display
the probe value again.
6.2 HOW TO CHANGE THE SET POINT
1. Push the SET key more than 2 sec to change the Set point value.
2. The value of the set point will be displayed and the “°C” or “°F” LED will start blinking.
3. To change the Set value push the UP or DOWN arrows within 10 sec.
4. To save the new set point value, push the SET key again or wait for 10 sec.
6.3 HOW TO START A MANUAL DEFROST
Push the DEF key for more than 2 sec and a manual defrost will start.
6.4 HOW TO: CHANGE A PARAMETER VALUE
To change a parameter value, operate as follows:
1. Enter the Programming mode by pressing the SET+DOWN buttons for 3s (the °C or °F LED will
start blinking).
2. Select the required parameter. Press the SET button to display its actual value.
3. Use UP or DOWN buttons to change its value.
4. Press SET button to store the new value and move to the following parameter.
To exit: Press SET + UP buttons or waiting for 15s without pressing any key.
NOTE: the set value is stored even when the procedure is exited by waiting for 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+DOWN buttons for 3 sec (the °C or °F LED
will start blinking).
2. Released the buttons and then push again the SET+DOWN buttons for more than 7s. The Pr2
label will be displayed immediately followed from the HY parameter.
Now it is possible to browse the hidden menu.
3. Select the required parameter.
4. Press the SET button to display its value.
5. Use UP or DOWN to change its value.
6. Press SET to store the new value and move to the following parameter.
To exit: Press SET+DOWN or wait 15 sec without pressing a key.
NOTE1: if no parameter is present in Pr1 menu, after 3 sec the “noP” message will be displayed.
Keep the buttons pushed till the Pr2 message will be displayed.
NOTE2: the set value is stored even when the procedure is exited by waiting for 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 (Pr2) can be moved into the user level (Pr1) by pressing
SET+DOWN buttons. If a parameter is part of the user level, when showed in the hidden menu the
decimal point will be lit.
6.6 HOW TO: LOCK THE KEYBOARD
1. Keep both UP and DOWN buttons pressed for more than 3 sec.
2. 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
3. If a button is pressed more than 3 sec the “PoF” message will be displayed
6.7 HOW TO: UNLOCK THE KEYBOARD
Keep pressed together for more than 3 sec the UP and DOWN 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 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.
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 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: (-100°C to SET; -148°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.
P2P Evaporator probe presence: (n; Y) n = not present, the defrost stops by time;
Y = present, the defrost stops by temperature.
oE Evaporator probe calibration: (-12.0 to 12.0°C; -21 to 21°F) allows to adjust possible
offset of the evaporator probe.
P3P Third probe presence (P3): (n; Y) n = not present, the terminals 18-20 operate as
digital input; Y = present, the terminals 18-20 operate as third probe.
o3 Third probe calibration (P3): (-12.0 to 12.0°C; -21 to 21°F) allows to adjust possible
offset of the third probe.
P4P Fourth probe presence: (n; Y) n = Not present; Y = present.
o4 Fourth probe calibration: (-12.0 to 12.0°C; -21 to 21°F) allows to adjust possible
offset of the fourth probe.
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.
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 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.
dL
Y
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 = evaporator probe; P3 =configurable probe; P4 = Probe on
Hot Key plug.
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.
Md
F
(Maximum) length for defrost: (0 to 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 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 = after the 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.

dixell XR70CX Specifications

General

Model	XR70CX
Category	Controller
Power Consumption	3 VA max
Resolution	0.1°C
Dimensions	32x74x60 mm
Mounting	Panel mounting
Operating Temperature	0°C to 60°C
Storage Temperature	-30°C to 85°C
Inputs	NTC or PTC probes
Digital Inputs	1
Outputs	Relay
Display	3 digits, red LED
Protection Degree	IP20
Relative Humidity	20% to 85% (non-condensing)