Dixell xri77cx инструкция на русском

Digital controller for variable speed compressors

XRi77CX

1.

GENERAL WARNING…………………………………………………………………………………………………………….. 1

2.

GENERAL DESCRIPTION……………………………………………………………………………………………………… 1

3.

CONTROLLING LOADS…………………………………………………………………………………………………………. 1

4.

VARIABLE SPEED COMPRESSOR CONTROL ……………………………………………………………………. 1

5.

PULL DOWN ………………………………………………………………………………………………………………………….. 2

6.

DUAL MAP FEATURE …………………………………………………ERROR! BOOKMARK NOT DEFINED.

7.

FRONT PANEL COMMANDS ………………………………………………………………………………………………… 2

8.

MAX & MIN TEMPERATURE MEMORIZATION …………………………………………………………………….. 2

9.

MAIN FUNCTIONS…………………………………………………………………………………………………………………. 2

10. PARAMETERS ………………………………………………………………………………………………………………………. 3

11. DIGITAL INPUTS ……………………………………………………………………………………………………………………. 4

12. RS485 SERIAL LINE – FOR MONITORING SYSTEMS ………………………………………………………… 5

13. INSTALLATION AND MOUNTING …………………………………………………………………………………………. 5

14. ELECTRICAL CONNECTIONS ………………………………………………………………………………………………. 5

15. HOW TO USE THE HOT KEY………………………………………………………………………………………………… 5

16. ALARM SIGNALS …………………………………………………………………………………………………………………… 5

17. TECHNICAL DATA…………………………………………………………………………………………………………………. 5

18. WIRINGS ……………………………………………………………………………………………………………………………….. 5

19. DEFAULT SETTING VALUES………………………………………………………………………………………………… 5

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 XRi77CX, format 32x74mm, is microprocessor based controller, suitable for applications on

medium or low temperature ventilated refrigerating units. It has four 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 six

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 probe inputs. The first

probe is used for temperature control. The second probe is used to control the defrost termination

temperature at the evaporator. One of the two digital inputs can operate as third temperature probe.

The fourth probe is used to control the condenser temperature (for condenser alarm management) or

to display a temperature.

The RS485 serial output allows connecting the unit to a network line (ModBUS-RTU compatible)

such as any dIXEL monitoring units of X-WEB family. The HOT-KEY receptacle allows

programming the controller by using an HOTKEY programming device.

The instrument is fully configurable through special parameters that can be easily programmed

through the frontal keyboard.

3. CONTROLLING LOADS

3.1 COMPRESSOR

The regulation is performed according

to the temperature measured by the

thermostat probe with a positive

differential (HY) over the set point: if the

temperature increases and reaches set

point plus differential, the compressor

will start. It will turn off as soon as 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).

The defrost interval depends on the presence of the RTC (optional). The internal RTC is controlled

by means of the EdF parameter:

EdF=in: the defrost is made every idF time – standard way for controller without RTC.

—

EdF=rtC: the defrost is real time controlled, depending on the hours set in the parameters

—

Ld1…Ld6 (for workdays).

Other parameters are used to control defrosting cycles: the maximum length (MdF) and defrosting

modes: timed or controlled by the evaporator’s probe (P2P).

RNC-2014-034 XRi77CX GB r1.0 07.03.2014.docx

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. How it works: if the temperature difference between evaporator probe and room probe

is higher than the FCt parameter value, fans will be switched on. With FCt=0 the function is disabled.

3.3.2 CYCLIC ACTIVATION OF THE FANS WITH COMPRESSOR OFF

When FnC=C-n or C-Y (fans working in parallel with 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, also when the compressor is off.

3.4 RELAY CONFIGURATION (PAR. oA0, oA1, oA2, oA3)

The functioning of the configurable relays (terminals 1-2 and 1-7-8) can be set by the oA1 and oA2

parameters, according to the kind of application. In the following paragraph the possible setting:

3.4.1 LIGHT RELAY

With oAx=LiG the related relay operates as light output.

3.4.2 AUXILIARY RELAY

Relay activation by digital input 1 or digital input 2 (oAx=AUS, i1F or i2F=AUS): with oAx=AUS

and i1F, i2F=AUS the AUX relay is switched on and off by digital inputs.

3.4.3 ON/OFF RELAY (OAX = ONF)

When oAx=onF, the related relay is activated when the controller is turned on and de-activated

when the controller is turned off.

3.4.4 NEUTRAL ZONE REGULATION

With oAx=db the related relay can control a heater element to perform a neutral zone action.

oAx cut in = SET-HY





oAx cut out = SET

3.4.5 ALARM RELAY

With oAx=Alr the related relay 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 stay on until the alarm condition recovers.

3.4.6 SECOND COMPRESSOR

If oAx=CP2, it will work as second compressor output. The anti-short cycle parameter AC1 gives the

possibility to desynchronize the compressor activations.

3.4.7 SECOND DEFROST OUTPUT

If oAx=dF2, it will work as second defrost output.

NOTE: It is also possible to manage 2 different and independent defrost by using special parameter

map. Please refer to Dixell to activate this function.

3.4.8 NIGHT BLIND MANAGEMENT DURING ENERGY SAVING CYCLES

With oAx=HES, the related relay operates to manage the night blind: the relay is energised when the

energy saving cycle is activated by digital input or frontal button.

3.4.9 HEATER FOR WATER DRIPPING

If oAx=Het, the related output will work as heater for water dripping during and after any defrost.

3.4.10

REGULATION OUTPUT

If oAx=inV, the related output will work as regulation output and will stay active as soon as the

regulation request is running.

4. VARIABLE SPEED COMPRESSOR CONTROL

The controller is able to drive variable speed compressor with frequency control input. The HOTKEY

port is able to issue a frequency signal from 30 to 200Hz, duty cycle=50%. A special cable (CAB-

KXV1) is used to connect the frequency output of the controller to the frequency input of the

compressor. One of the available relays can be set as oAx=inV in order to control the condenser

fan. In this case the fans will be activated only when the regulation is running.

NOTE: in case of using an inverter compressor, it must be controlled ONLY from the frequency

output. DO NOT USE ANY RELAY TO CONTROL THE COMPRESSOR POWER SUPPLY.

4.1 CABLE FOR FREQUENCY OUTPUT

CAB/KXV1

4.2 PARAMETERS

The following parameters are used to set the regulation:

HY1

Differential for proportional band: (0.1 to 25.5°C; 1 to 45°F)

PMi

Lower speed limit (in percentage): (0 to PMA)

PMA

Upper speed limit (in percentage): (Pmi to 100%)

XR77CX

The wiring polarity follows:

WHITE  GND (-)

GREEN  FREQ (+)

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