Table des Matières
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Digital controller
XR50CH
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
1.
DIGITAL INPUT (ENABLED WITH P3P = N) ................................................................................3
2.
TTL SERIAL LINE – FOR MONITORING SYSTEMS ...................................................................3
3.
X-REP OUTPUT – OPTIONAL ......................................................................................................3
4.
INSTALLATION AND MOUNTING ................................................................................................3
5.
ELECTRICAL CONNECTIONS .....................................................................................................3
6.
HOW TO USE THE HOT KEY .......................................................................................................3
7.
ALARM SIGNALS ..........................................................................................................................3
8.
TECHNICAL DATA ........................................................................................................................3
9.
CONNECTIONS .............................................................................................................................4
10. 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.
•
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
Model XR50CH, format 32 x 74 mm, is microprocessor based controller, suitable for applications on
medium or low temperature refrigerating units. It has 3 relay outputs to control compressor and
defrost, which can be either electrical or reverse cycle (hot gas) and the other one can be used for
auxiliary output. 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 HOT KEY output allows connecting the unit, by means of the external module XJ485-CX, to a
network line ModBUS-RTU compatible such as the Dixell monitoring units of X-WEB family. It allows
programming 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
3.1 NEUTRAL ZONE REGULATION (COMPRESSOR AND HEATER)
The compressor works in this way:
•
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 starts and then turned off when the
temperature reaches the set point value again.
The heater works in this way:
•
The regulation is performed according to the temperature measured by the thermostat
probe with a negative differential from the set point: if the temperature decreases and
reaches set point minus differential the heater is starts and then turned off when the
temperature reaches the set point value again.
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.
manuale RNC 2018 277
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 lock & unlock the keyboard.
+
To enter in programming mode.
+
To return to the room temperature display.
4.1 USE OF LEDS
Each LED function is described in the following table.
LED
MODE
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 enabled
ECO
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 DOWN key.
2.
The "Lo" message will be displayed followed by the minimum temperature recorded.
3.
By pressing the DOWN key again or by waiting 5 sec the normal display will be restored.
5.2 HOW TO SEE THE MAX TEMPERATURE
1.
Press and release the UP key.
2.
The "Hi" message will be displayed followed by the maximum temperature recorded.
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 for 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 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 sec to display
the probe value again.
6.2 HOW TO CHANGE THE SETPOINT
1.
Push the SET key for 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 starts blinking;
3.
To change the Set value, push the UP or DOWN arrows within 10 sec.
4.
To memorise the new set point value push the SET key again or wait 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 the parameter's value, operate as follows:
1. Enter the Programming mode by pressing the SET+ DOWN keys for 3 sec (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.
XR50CH
FUNCTION
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