Front Panel Commands, Contents, General Warnings

dIXEL	Operating Manual	1592020130

DIGITAL CONTROLLER

6. FRONT PANEL COMMANDS

XR03CX – XR04CX

1. CONTENTS

1.	Contents __________________________________________________________________________ 1
2.	General warnings ___________________________________________________________________ 1
3.	General description __________________________________________________________________ 1
4.	Regulation _________________________________________________________________________ 1
5.	Defrost ___________________________________________________________________________ 1
6.	Front panel commands _______________________________________________________________ 1
7.	Parameters ________________________________________________________________________ 1
8.	Digital inputs _______________________________________________________________________ 2
9.	Installation and mounting _____________________________________________________________ 2
10.	Electrical connections ________________________________________________________________ 2
11.	How to use the hot key _______________________________________________________________ 2
12.	Alarm signalling_____________________________________________________________________ 2

AUX

KEYS COMBINATION

To display target set point, in programming mode it selects a parameter or confirm an operation

To start a manual defrost

In programming mode it browses the parameter codes or increases the displayed value

In programming mode it browses the parameter codes or decreases the displayed value

13.	Technical data______________________________________________________________________ 2
14.	Connections _______________________________________________________________________ 3
15.	Default setting values ________________________________________________________________ 3

2. GENERAL WARNINGS

PLEASE READ BEFORE USING THIS MANUAL

1.This manual is part of the product and should be kept near the instrument for easy and quick reference.

2.The instrument shall not be used for purposes different from those described hereunder. It cannot be used as a safety device.

3.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 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.

3. GENERAL DESCRIPTION

The XR03CX, in 32⋅74x50mm short format, is microprocessor based controller suitable for applications on normal temperature refrigerating units. It provides two relay output: one for compressor and the other one for alarm signalling or as auxiliary output. It provides an NTC probe input and a digital input for alarm signalling, for switching the auxiliary output or for start defrost. The instrument is fully configurable through special parameters that can be easily programmed through the keyboard or the by HOTKEY.

The XR04CX, in 32⋅74x50mm short format, is microprocessor based controller suitable for applications on normal or low temperature refrigerating units. It provides two relay output: one for compressor and the other one for defrost. It provides two NTC probe inputs, one for room temperature and other one to control defrost termination. The instrument is fully configurable through special parameters that can be easily programmed through the keyboard or the by HOTKEY.

4. REGULATION

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 “Cy” and “Cn”.

5. DEFROST

XR03CX

Defrost is performed through a simple stop of the compressor. Parameter “id” controls the interval between defrost cycles, while its length is controlled by parameter “Md”.

XR04CX

Two defrost modes are available through the “td” parameter:

•td=EL → defrost through electrical heater (compressor OFF)

•td=in → hot gas defrost (compressor ON).

Other parameters are used to control the interval between defrost cycles (id) ), its maximum length (Md) and two defrost modes: timed or controlled by the evaporator’s probe. At the end of defrost dripping time is started, its length is set in the dt parameter. With dt=0 the dripping time is disabled.

+	To lock or unlock the keyboard
+	To enter in programming mode
+	To return to room temperature display

LED	MODO	SIGNIFICATO
	On	Compressore enabled
	Flashing	Anti short cycle delay enabled (AC parameter)
	On	Defrost in progress
	Flashing	Dripping in progress
	On	Measurement unit
	Flashing	Programming mode
	On	Measurement unit
	Flashing	Programming mode

HOW TO SEE THE SET POINT

1.Push and immediately release the SET key, the set point will be showed;

2.Push and immediately release the SET key or wait about 5s to return to normal visualisation.

HOW TO CHANGE THE SETPOINT

1.Push the SET key for more than 2 seconds 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 o or n arrows within 10s.

4.To memorise the new set point value push the SET key again or wait 10s.

HOW TO START A MANUAL DEFROST

Push the DEF key for more than 2 seconds and a manual defrost will start

HOW TO CHANGE A PARAMETER VALUE

To change the parameter’s value operate as follows:

1.Enter the Programming mode by pressing the SET+ keys for 3s (“°C” or “°F” LED starts blinking).

2.Select the required parameter. Press the “SET” key to display its value

3.Use or to change its value.

4.Press “SET” to store the new value and move to the following parameter.

To exit: Press SET+ or wait 15s without pressing a key.

NOTE: the set value is stored even when the procedure is exited by waiting the time-out to expire.

HIDDEN MENU

The hidden menu includes all the parameters of the instrument.

HOW TO ENTER THE HIDDEN MENU

1.Enter the Programming mode by pressing the SET+ keys for 3s (“°C” or “°F” LED starts blinking).

2.Released the keys, then push again the SET+ keys for more than 7s. The L2 label will be displayed immediately followed from the Hy parameter.

NOW YOU ARE IN THE HIDDEN MENU.

3.Select the required parameter.

4.Press the “SET” key to display its value

5.Use or to change its value.

6.Press “SET” to store the new value and move to the following parameter.

To exit: Press SET+ or wait 15s without pressing a key.

NOTE1: if none parameter is present in L1, after 3s the “nP” message is displayed. Keep the keys pushed till the L2 message is displayed.

NOTE2: the set value is stored even when the procedure is exited by waiting the time-out to expire.

HOW TO MOVE A PARAMETER FROM THE HIDDEN MENU TO THE FIRST LEVEL AND VICEVERSA.

Each parameter present in the HIDDEN MENU can be removed or put into “THE FIRST LEVEL” (user level) by pressing SET+ . In HIDDEN MENU when a parameter is present in First Level the decimal point is on.