dixell CX620 Instructions d'installation et d'utilisation

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dIXEL

XW40K 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 XW40K 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 three relay

outputs to control compressor, defrost - which can be either electrical or hot gas - 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.

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.

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.

1592026010 XW40K GB R1.0 22.02.2008.doc

Installing and Operating Instructions

formation of

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.

With ACH = Ht: aux relay cut in is SAA-SHy, cut out SAA.

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.

To see the max. stored temperature; in programming mode it browses the

parameter codes or increases the displayed value.

By holding it pressed for 3s the fast freezing cycle is started.

To see the min stored temperature; in programming mode it browses the parameter

codes or decreases the displayed value.

By holding it pressed for 3s the defrost is started.

Switch ON and OFF the cold room light.

Switch ON and OFF the instrument.

KEY COMBINATIONS

To lock and unlock the keyboard.

To enter the programming mode.

To exit the programming mode.

XW40K

1592026010

T620

CX620

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