dIXEL
Installing and Operating Instructions 1592027050
1592027050 XW60L RTC GB r1.0 27.06.2008.doc XW60L 1/6
Digital controller for medium-low temperature
refrigeration applications
XW60L
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.p.A.” (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 XW60L, format 38x185mm, is microprocessor based controller, suitable for applications on
medium or low temperature ventilated refrigerating units. It has 4 relay outputs to control
compressor, fan, defrost, which can be either electrical or reverse cycle (hot gas) and light
(configurable). It could be provided with a Real Time Clock which allows programming of up to 6 daily
defrost cycles, divided into holidays and workdays. A “Day and Night” function with two different set
points is fitted for energy saving. It is also provided with up to four 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 and to managed the fan. One of the 2 digital inputs can operate as third
temperature probe. The fourth probe is used to signal the condenser temperature alarm or to display
a temperature.
The HOT KEY output allows to connect the unit, by means of the external module XJ485-CX, to a
network line ModBUS-RTU compatible such as the dIXEL monitoring units of X-WEB family. It
allows to program 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 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.
Time
Temper.
Compr.
SET
ON
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).
The defrost interval depends on the presence of the RTC (optional). If the RTC is present is
controlled by means of parameter “EdF”:
-with EdF=in the defrost is made every “IdF” time – standard way for controller without RTC.
-with EdF = “rtc”, the defrost is made in real time depending on the hours set in the parameters
Ld1..Ld6 on workdays and in Sd1…Sd6 in holidays;
Other parameters are used to control defrost cycles: 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 Fdt parameter. With Fdt =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.
3.3.2 Cyclical activation of the fans with compressor off.
When Fnc = c-n or c-Y (fans in parallel to the compressor), by means of the Fon and FoF
parameters the fans can carry out on and off cycles even if the compressor is switched off. When the
compressor is stopped the fans go on working for the Fon time. With Fon =0 the fans remain always
off, when the compressor is off.
3.4 LIGHT RELAY CONFIGURATION
The functioning of the auxiliary relay (terminals. 1-3) can be set by the oA3 parameter, according to
the kind of application. In the following paragraph the possible setting:
3.4.1 Auxiliary thermostat
I.E.. anti condensing heater) with the possibility of switching it on and off also by keyboard
Parameters involved:
- ACH Kind of regulation for the auxiliary relay: Ht: heating; cL: cooling;
- SAA Set point for auxiliary relay
- SHy Differential for auxiliary relay
-ArP Probe for auxiliary relay
- Sdd Auxiliary output off during defrost
By means of these 5 parameters the functioning of the auxiliary relay can be set.. The differential is
given by the SHy parameter.
The auxiliary relay can be switched on also by the AUX button. In this case it remains on till it’s
manually switched off.
NOTE: Set oA3 =AUS and ArP= nP (no probe for auxiliary output).
In this case the relay 1-3 can be activated only by digital input with i1F or i2F = AUS.
3.4.2 On/off relay – oA3 = onF
In this case the relay is activated when the controller is turned on and de-activated when the
controller is turned off.
3.4.3 Neutral zone regulation
With oA3 = db the relay 1-3 can control a heater element to perform a neutral zone action.
oA3 cut in = SET-HY
oA3 cut out = SET
3.4.4 Second compressor
With oA3 = CP2, the relay 1-3 operates as second compressor: it is activated in parallel with the
relay of the first compressor, with a possible delay set in the AC1 parameter. Both the compressors
are switched off at the same time.
3.4.5 Alarm relay
With oA3 = ALr the relay 1-3 operates as alarm relay. It is activated every time an alarm happens.
Its status depends on the tbA parameter: if “tbA = y”, the relay is silenced by pressing any key.
If “tbA = n”, the alarm relay remains on until the alarm condition recovers.
3.4.6 Night blind management during energy saving cycles
With oA3 = HES, the relay 1-3 operates to manage the night blind: the relay is energised when the
energy saving cycle is activated , by digital input, frontal button or RTC (optional)
4. FRONT PANEL COMMANDS
4.1 STANDARD FRONTAL PANEL
4.2 STEEL FINISHING
: 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.
To switch the light, if oA3 = Lig.
KEY COMBINATIONS:
+ To lock & unlock the keyboard.
