1592007251 XR60C-D GB r1.0 08.04.2015 XR60C – XR60D 1/4
Digital controller with defrost and fans management
XR60C – XR60D
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.
Dixell Srl reserves the right to change the composition of its products, even without notice,
ensuring the same and unchanged functionality.
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.
2. GENERAL DESCRIPTION
Models XR60C, format 32 x 74 mm, and XR60D, DIN rail format, are microprocessor based
controller, suitable for applications on medium or low temperature ventilated refrigerating
units. They have three relay outputs to control compressor, fan, and defrost, which can be
either electrical or reverse cycle (hot gas). It is also provided with two NTC or PTC probe
inputs, one for temperature control, the other, to be located onto the evaporator, to control the
defrost termination temperature and to managed the fan. 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.
3.3 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 during defrost;
FnC = o_n fans will run even if the compressor is off, and not run during 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 during defrost;
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”.
3.3.1 Forced activation of 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. Functioning: if the difference of temperature between the evaporator and the
room probes is more than the value of the Fct parameter, the fans are switched on. With
Fct=0 the function is disabled.
4. FRONT PANEL COMMANDS
XR60C XR60D
SET: To display target set point; in programming mode it selects a parameter or confirm an
operation.
(DEF) To start a manual defrost
o (UP): To see the last temperature alarm happened; in programming mode it browses the
parameter codes or increases the displayed value.
n (DOWN) To see the last temperature alarm happened; in programming mode it browses
the parameter codes or decreases the displayed value.
KEY COMBINATIONS:
o + n
To lock & unlock the keyboard.
SET + n To enter in programming mode.
SET + o To return to the room temperature display.
4.1 USE OF LEDS
Each LED function is described in the following table.
LED
MODE
FUNCTION
ON
Compressor enabled
Flashing
-Programming Phase (flashing with )
- Anti-short cycle delay enabled
ON
Defrost enabled
Flashing
- Programming Phase (flashing with )
- Drip time in progress
ON
Fans enabled
Flashing
Fans delay after defrost in progress.
ON
An temperature alarm happened
5. TEMPERATURE ALARM AND ITS DURATION RECORDING (HACCP)
XR60C signals and records temperature alarms, together with their duration and max value
reached. See drawing:
Ex. High temperature alarm
Set
ALu
High temp. alarm
Time
Temperature
ALL
Low temp. alarm
X
X
X
Alarm duration
Max
Temperature
Safe food zone
5.1 HOW TO SEE THE ALARM DURATION AND MAX (MIN) TEMPERATURE
If the alarm LED is on, an alarm has taken place. To see the kind of alarm, the max (min)
reached temperature and alarm duration do as follows:
1. Push the Up or Down key.
2. On the display the following message is shown: “HAL” for high temperature alarm
(“LAL” for the minimum allarm), followed by the Maximum (minimum) temperature,
then the “tiM” (tiMe) message is displayed, followed by the “Duration” in h.mm.
3. Then the instrument displays the temperature once again.
NOTE1: if an alarm is still occurring the “tim” shows the partial duration.
NOTE2: the alarm is recorded when the temperature come back to normal values
5.2 HOW TO RESET A RECORDED ALARM OR ONE THAT IS STILL
OCCURRING
1. Hold the SET key pressed for more than 3s, while the recorded alarm is displayed. (the
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.
1592007251 XR60C-D GB r1.0 08.04.2015 XR60C – XR60D 2/4
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
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:
1. Enter the Programming mode by pressing the Set and DOWN key for
3s ( and start blinking).
2. Select the required parameter.
3. Press the “SET” key to display its value (now only the LED is
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 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 key for 3s
(LED 1 and start blinking).
2. When a parameter is displayed keep pressed the Set+n 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 (Now only the LED is blinking).
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.
NOTE: 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 and DOWN keys.
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 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 in continuous 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 “o”
for 3 seconds.
7. PARAMETERS
NOTE: the parameters preceded by dots are in the Hidden Menu.
REGULATION
Hy Differential: (0,1 ÷ 25,5°C / 1÷255 °F) Intervention differential for set point. Compressor
Cut IN is Set Point Plus 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 acceptable value
for the set point.
US Maximum set point: (SET÷110°C/ SET÷230°F). Set the maximum acceptable
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.
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.
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.
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.
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 Display : select which probe is displayed by the instrument: P1 = Thermostat
probe; P2 = Evaporator probe
DEFROST
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.
FANS
FnC Fans operating mode: 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÷255min) Time interval between end of defrost and
evaporator fans start.
Fct Temperature differential avoiding short cycles of fans (0÷59°C; Fct=0 function
disabled). If the difference of temperature between the evaporator and the room probes
is more than the value of the Fct parameter, the fans are switched on.
FSt Fans stop temperature: (-50÷50°C/122°F) setting of temperature, detected by
evaporator probe, above which fans are always OFF.
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.
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.
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; LHt =not
enabled; Htr = kind of action inversion (cooling – heating).
did: (0255 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
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