dixell XR40C Installing And Operating Instructions
Dixell
Installing and Operating Instructions
1592007230
1592007230 XR40C GB r1.0 15.05.2003 XR40C 1/4
Digital controller with defrost management
XR40C
CONTENTS
1. GENERAL WARNING __________________________________________1
2. GENERAL DESCRIPTION_______________________________________ 1
3. CONTROLLING LOADS ________________________________________1
4. FRONT PANEL COMMANDS ____________________________________1
5. TEMPERATURE ALARM AND ITS DURATION RECORDING (HACCP) ___ 1
6. MAIN FUNCTIONS_____________________________________________1
7. PARAMETERS________________________________________________ 2
8. DIGITAL INPUT _______________________________________________3
9. INSTALLATION AND MOUNTING _________________________________ 3
10. ELECTRICAL CONNECTIONS ___________________________________3
11. HOW TO USE THE HOT KEY____________________________________3
12. ALARM SIGNALS______________________________________________3
13. TECHNICAL DATA_____________________________________________3
14. CONNECTIONS_______________________________________________4
15. 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
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
Model XR40C, 32x74 mm format, is a 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 two NTC or PTC probe inputs, one
for temperature control, the other, to be located onto the evaporator, to control the
defrost termination temperature. 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.
4. FRONT PANEL COMMANDS
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
Flashin
g
-Programming Phase (flashing with
)
- Anti-short cycle delay enabled
ON Defrost enabled
Flashin
g
- Programming Phase (flashing with
)
- Drip time in progress
ON An temperature alarm happened
5. TEMPERATURE ALARM AND ITS DURATION
RECORDING (HACCP)
XR40C signals and records temperature alarms, together with their duration and
max value reached. See drawing:
Ex. High temperature alarm
Set
A
Lu
High temp. alarm
Time
Temperature
ALL
Low temp. alarm
X
X
X
A
larm 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” fot 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.
6.2 HOW TO CHANGE THE SETPOINT
1. Push the SET key for more than 2 seconds to change the Set point value;
Dixell
Installing and Operating Instructions
1592007230
1592007230 XR40C GB r1.0 15.05.2003 XR40C 2/4
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 o and n 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.
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: (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
÷15) Number of activation of the pressure
switch, during the “did” 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 Compr essor status when open door: no, Fan = normal; CPr, F_C =
Compressor OFF
OTHER
PbC Type of probe: it allows to set the kind of probe used by the instrument: PbC
= PBC probe, ntC = NTC probe.
• dP1 First probe display
• dP2 Second probe display
• rEL Software release for internal use.
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