Emerson dixell XW60K E T620T Instrucciones De Manejo página 9

dIXEL
XW60K AND T620 – V620 – CX620
1. GENERAL WARNING
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.
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
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 XW60K is microprocessor based controller suitable for applications on medium or low
temperature refrigerating units. It has to be connected by means of a two-wire cable (∅ 1mm) at a
distance of up to 30 meters to the keyboard T620 or V620 or CX620. It is provided with four relay
outputs to control compressor, defrost - which can be either electrical or hot gas - the evaporator fans
and light. It is also provided with 4 NTC probe inputs, one for temperature control, one to control the
defrost end temperature of the evaporator and the third and fourth to control condenser temperature
or to display another 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 THE 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".
The relay of the second compressor 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.
3.2 FAST FREEZING
When defrost is not in progress, it can be activated by holding the "o" key pressed for about 3
seconds. 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
"o" for 3 seconds.
3.3 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.
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".
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.
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
1592026020 XW60K GB R1.0 22.02.2008.doc
Installing and Operating Instructions
formation of
is stopped the fans go on working for the Fon time. With Fon =0 the fans remain always off, when the
compressor is off.
4. Relay 22-23 configuration- special functions
By means of the parameter oA3, it's possible to configure the functions of the light relay (22-23), as
described in the following paragraphs:
OA3 = LIG: LIGHT RELAY (FACTORY SETTING)
By setting oA3 = Lig the relay will work as light relay, it is switched on and off by the light button on the
keyboard and is affected by status of the digital input when i1F = dor.
ND
OA3 = CP2 2 COMPRESSOR MANAGEMENT
By setting oA3 = cP2, the relay at terminals 22-23 will operate as "second compressor". It will be
activated in parallel with the relay of the first compressor, with a possible delay set in the AC1
parameter (seconds). Both the compressors are switched off at the same time.
OA3 = ONF: ON –OFF RELAY
By setting oA3 =onF, the relay will operate as "on-off" relay: it will be activated when the controller is
switched on and it will be switched off when the controller is in stand-by status.
OA3 = AUS: AUXILIARY RELAY
By setting oA3 = AUS, the relay 22-23 will work as auxiliary thermostat (I.E.. anti condensing heater).
Parameters involved:
- ACH (cL, Ht): Kind of regulation for the auxiliary relay: Ht = heating / CL = cooling;
- SAA (-50÷150) Set point for auxiliary relay
- SHy (0÷25.5°C) Differential for auxiliary output.
With ACH = CL: aux relay cut in is SAA+SHy, cut out SAA.
o
With ACH = Ht: aux relay cut in is SAA-SHy, cut out SAA.
o
- ArP (nP, P1, P2, P3, P4) Probe for auxiliary relay
- Sdd (n, Y) Auxiliary output working during defrost
OA3 = ALR: ALARM RELAY
By setting oA3 = ALr the relay will work as alarm relay, it is switched on when an alarm happens.
Parameters involved:
- tbA (n, y) Alarm relay silencing
- AoP (cL; oP) Alarm relay polarity
OA3 = DB: NEUTRAL ZONE
By setting oA3 = db the controller will perform a
"neutral zone" regulation.
The heating element has to be connected to the
oA3 relay (22-23)
If the temperature increases and reaches set
point plus differential (+HY) the compressor is
started and then turned off when the
temperature reaches the set point value again.
If the temperature decreases and reaches the
set point minus differential( -HY) the oA3 output
(heater) is switched on and then turned OFF
when the temperature reaches again the set
point.
5. Keyboards
V620
To display and modify target set point; in programming mode it selects a parameter
or confirm an operation. By holding it pressed for 3s when max or min temperature
is displayed it will be erased.
XW60K
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T620
CX620
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