dixell XR460C Installing And Operating Instructions

dIXEL

Installing and Operating Instructions

1592018110

1592018110 XR460C GB r1.0 04.07.2005 XR460C 1/5

XR460C

DUAL TEMPERATURE CONTROLLER

Contents

1. GENERAL WARNING __________________________________________________________ 1

2. GENERAL DESCRIPTION_______________________________________________________ 1

3. TEMPERATURE CONTROL _____________________________________________________ 1

4. DEFROST ___________________________________________________________________ 1

5. CONTROL OF EVAPORATOR FANS (ONLY FOR SECTION 1)_________________________ 1

6. THE DISPLAY ________________________________________________________________ 1

7. PARAMETER LIST_____________________________________________________________ 2

8. DIGITAL INPUT _______________________________________________________________ 4

9. INSTALLATION AND MOUNTING_________________________________________________ 4

10. ELECTRICAL CONNECTIONS ___________________________________________________ 4

11. SERIAL LINE _________________________________________________________________ 4

12. USE OF THE PROGRAMMING “HOT KEY “ ________________________________________ 4

13. ALARM SIGNALS______________________________________________________________ 4

14. TECHNICAL DATA_____________________________________________________________ 5

15. WIRING CONNECTIONS _______________________________________________________ 5

16. 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.

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 XR460C, 32x74 mm format, is a microprocessor based controller, able to control 2
temperatures in an independent way.
The first section is suitable for applications on medium or low temperature refrigerating units. It is
provided with 3 relay outputs to control compressor, defrost - which can be either electrical or hot
gas - and the evaporator fans. It is also provided with 2 NTC or PTC probe inputs, one for
temperature control the other one to control the defrost end temperature of the evaporator.
The second section is suitable for applications on medium or normal temperature refrigerating
units, with timed defrost. It’s provided with 1 relay output to control compressor. It is also provided
with 1 NTC/PTC probe inputs, for temperature control.
There are two digital inputs (free contact) completely configurable by parameter.
The standard TTL output allows the user to connect, by means of a TTL/RS485 external module, a

ModBUS-RTU compatible monitoring system and to programme the parameter list with the “Hot
Key”.

3. TEMPERATURE CONTROL

3.1 THE COMPRESSOR 1 (2)

For each section, the regulation is
performed according to the
temperature measured by its own
thermostat probe with a positive
differential from the set point.
If the temperature increases and
reaches set point1 (2) plus
differential1 (2) 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 “COn1(2)” and “COF1(2)”.

4. DEFROST

4.1 SECTION 1
For the section 1 two defrost modes are available through the “tdF1” parameter:

tdF1= rE defrost with electrical heater
tdF1= in or hot gas.
The defrost interval is control by means of parameter “EdF”:
rtc (only for instruments with RTC): beginning of defrost cycles is set by the L1d1÷L1d6
parameters during the working days and S1d1÷S1d6 during the holidays
in the defrost is made every “IdF” time
Sd the interval “IdF” is calculate through Smart Defrost algorithm (only when the compressor is ON)
At the end of defrost the drip time is controlled through the “Fdt” parameter.

4.2 SECTION 2

For the section 2 the defrost interval is control by means of parameter “EdF2”: with EdF=in the
defrost is made every “IdF2” time, with EdF2=Sd the interval “IdF2” is calculate through Smart
Defrost algorithm (only when the compressor 2 is ON).
Defrost is performed through a simple stop of the compressor2. Parameter “IdF2” controls the
interval between defrost cycles, while its length is controlled by parameter “MdF2”.

4.3 RELATION BETWEEN DEFROSTS

Different kinds of defrosts are available for each section.
The relation between defrosts is set by the dFS parameter: relation between defrosts.
4 relation between the 2 sections of the controller are available, to manage different kinds of
applications:

in = independent defrosts;
StS = same defrost start, synchronised defrost end;
St = same defrost start, independent defrost end;
SE = sequential defrost;

4.3.1 dFS= in - independent defrosts

The defrosts of the 2 sections of controller are completely independent.

First section: defrost interval is set by idF1 parameter.
Second section: defrost interval is set by idF2 parameter.
The defrost interval is control by means of parameter “EdF1(2)”:
in the defrost is made every “IdF” time
Sd the interval “IdF” is calculate through Smart Defrost algorithm (only when the compressor is ON)

Manual defrost activation, by pushing the DOWN key (defrost 1) or UP key (defrost 2).
By pushing the Down key or Up key for 3s, a defrost request is generated for section 1 or 2
respectively. The defrost interval is re-loaded.

4.3.2 dFS = StS – Same defrost star t, end defrost synchronised or dFS = St

- Same defrost start, end defrost independent.

The defrost of the 2 sections of controller starts at the same time. idF1 parameter sets the def rost
interval for both the sections. The defrosts are performed at regular interval if EdF1 = in or according
to the Smartdefrost algorithm if EdF1 = Sd.

With dFS = StS regulation restarts only when defrost is finished for bot h the sections. The section
that finishes the defrost before the other starts dripping time until also the other sect ion has not
finished its defrost.
Manual defrost activation, by pushing the DOWN key (defrost 1) or UP key (defrost 2).
By pushing the Down key or Up key for 3s, a defrost request is generated for both the sections 1 and

2. The defrost interval is re-loaded.
With dFS = St each section restarts regulation as soon as its defrost is finished.

4.3.3 dFS = SE – sequential defrost

The defrost of 2 sections is synchronised. idF1 parameter sets the defrost interval for both the
sections. Defrosts are performed at regular interval if EdF1 = in or according to the Smartdefrost
algorithm if EdF1 = Sd. Section 1 does its defrost first, at the end of the defrost of section 1, section
2 starts its defrost..
Manual defrost activation, by pushing the DOWN key (defrost 1) or UP key (defrost 2).
By pushing the Down key or Up key for 3s, a defrost request is generated for both the sections 1 and

2. The defrost interval is re-loaded.

5. CONTROL OF EVAPORATOR FANS (ONLY FOR SECTION 1)

Section 1 has 1 relay to control evaporator fan.
The fan control mode is selected by means of the “FnC1” parameter:

FnC1=C-n fans will switch ON and OFF with the compressor and not run during defrost:;
FnC1= O-n fans will run continuously, but not during defrost

After defrost, there is a timed fan delay allowing for drip time, set by means of the “Fnd1” parameter.

FnC1=C-y fans will switch ON and OFF with the compressor and run during def rost;
FnC1=O-y fans will run continuously also during defrost

An additional parameter “FSt1” provides the setting of temperature, detected by the evaporator
probe, above which the fans are always OFF. This can be used to make sure circulation of air only if
his temperature is lower than set in “FSt1”.

dIXEL

Installing and Operating Instructions

1592018110

1592018110 XR460C GB r1.0 04.07.2005 XR460C 2/5

6. THE DISPLAY

X----C

XR40 0

The display is divided in 2 parts:
Upper left part: to see the temperature2 (upper display)
Lower left part: to see the temperature1(lower display)

6.1 THE KEYBOARD
SET1 To display and modify target set point1; in programming mode it selects a parameter or

confirm an operation.
To switch on/off the instrument: by holding it pressed f or 5s the instrument is switched in

stand by mode.
SET2 To display and modify target set point 2.

o/

(UP/DEFROST 2) in programming mode it browses the parameter codes or increases

the displayed value. By holding it pressed for 3s the defrost for section 2 is started

.

n/

(DOWN/DEFROST 1) in programming mode it browses the parameter codes or

decreases the displayed value. By holding it pressed for 3s the defrost for section 1 is started

o + n

To lock and unlock the keyboard.

SET +

n To enter the programming mode.

SET +

o To exit the programming mode.

6.2 MEANING OF THE ICONS

6.2.1 I
con

FUNCTION

6.2.2 Meaning

ON Celsius degree
ON Fahrenheit degree
ON Compressor 1 on

FLASHING Anti-short cycle delay enabled for compressor 1
ON Compressor 2 on
FLASHING Anti-short cycle delay enabled for compressor 2
ON Defrost 1 in progress

FLASHING Drip time in progress for section 1
ON Defrost 2 in progress
ON Fan enabled
FLASHING Drip time in progress
ON ALARM signal

6.3 HOW TO SEE AND MODIFY THE SET-POINT

Push and release the SET1 or SET2 key:
the bottom display shows the label St1 or St2
the upper display shows the Set point value flashing
To change the Set value push the o or n within 15s.
To memorise the new set point value push the SET1 or SET2 key again or wait 15s.

6.4 HOW TO START A MANUAL DEF ROST F OR THE SECTION 1 OR SECTION 2

To start a defrost for the section 1: push the DOWN key( ) for 3s.
To start a defrost for the section 2: push the UP key(

) for 3s.

6.5 HOW TO ENTER T HE “PR1” PARAMETER LIST

To change the parameter’s value operate as follows:
Enter the Programming mode by pressing the Set1 and DOWN key for 3s
The controller will show the first parameter present in the Pr1 menu:
Bottom menu: label
Upper menu: value

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

6.6 HOW TO ENTER IN PARAMET ERS L I ST “PR2”

To access parameters in “Pr2”:
Enter the “Pr1” level.
Select “Pr2” – “PAS” parameter and press the “SET1” key.

The flashing value “0 - - ” is displayed. use o or n to input the security code and confirm the figure
by pressing “SET” key.

The security code is “321”.
If the security code is correct the access to “Pr2” is enabled by pressing “SET1” on the last digit.

Another possibility is the following:

After switching ON the instrument, within 30 seconds, push SET1 + n keys together for 3s: the Pr2
menu will be entered.

6.7 HOW TO MOVE A PARAMETER FROM T HE “PR2” MENU TO “PR1” AND VICE VERSA.
Each parameter present in “Pr2” MENU can be removed or put into “Pr1”, user level, by pressing

“SET1 + n”.
In “Pr2” when a parameter is present in “Pr1” the decimal point LE of the bottom display is on.

6.8 HOW TO CHANGE A PARAMETER

To change a parameter value operates as follows:
Enter the Programming mode
Select the required parameter.
Press the “SET1” key and the value starts blinking.
Use “UP” or “DOWN” to change its value.
Press “SET1” to store the new value and move to the following parameter.

TO EXIT: Press SET1 + o 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.

6.9 HOW TO LO CK T HE KEYBOARD

Keep pressed for more than 3 s the o and n keys.
The “POF” message will be displayed and the keyboard will be locked. At this point it will be possible
only to see the set points.
If a key is pressed more than 3s the “POF” message will be displayed.

6.10 TO UNLOCK THE KEYBOARD

Keep pressed together for more than 3s the o and n keys, till the “Pon” message will be
displayed.

6.11 ON/OFF FUNCTION – HOW TO SWITCH ON AND OFF THE CONTROLLER

If the function is enabled (par. onF=yES), by pressing the SET1 key for more than 5s the controller
is switched OFF. The stand-by function switches OFF all the relays and stops the regulation. During
the stand by if a monitored unit is connected, it does not record the instrument data and alarms
To switch the instrument on again press the SET1 key for 5s.

NOTE1: When the instrument is under Stand-by, all the relays are under power supply. Don’t
connect any loads to the normal closed contact of the relays.

NOTA2: With the instrument in stand-by, it’s possible to see and modify the set points and enter the
programming mode.

7. PARAMETER LIST

DIFFERENTIALS

Hy1 Differential1: (0,1÷25,5°C; 1÷45°F): Intervention differential for set point1, always positive.

Compressor1 Cut IN is Set Point Plus Differential1 (Hy1). Compressor1 Cut OUT is when the
temperature reaches the set point1.

Hy2 Differential2: (0,1÷25,5°C; 1÷45°F): Intervention differential for set point2, always positive.

Compressor2 Cut IN is Set Point2 Plus Differential2 (Hy2). Compressor2 Cut OUT is when the
temperature reaches the set point2.

REGULATION – SECTION 1

LS1 Minimum set point1 limit: (-50,0°C÷SET1; -58°F÷SET1) Sets the minimum acceptable value

for the set point1.

US1 Maxi mum set point1 limit: (SET1

÷110°C; SET1÷230°F) Set the maximum acceptable value

for set point1.

OdS1 Outputs activation delay of section 1 at start up: (0÷255 min) This function is enabled

at the initial start up of the instrument and inhibits any output act ivation of the section 1 for the
period of time set in the parameter. (Light can work)

AC1 Anti-short cycle delay for co mpressor1: (0÷30 min) interval between the compressor1 stop

and the following restart.

Con1 Compressor1 ON time with faulty probe1: (0÷255 min) time during which the compressor1

is active in case of faulty thermostat probe. With COn=0 compressor1 is always OFF.

COF1 Compressor1 OFF time with faulty probe1: (0÷255 min) time during which the compressor

is off in case of faulty thermostat probe. With COF=0 compressor is always active.

CH1 Kind of action for secti on 1: CL = cooling; Ht = heating

REGULATION – SECTION 2

LS2 Minimum set point2 limit: (-50,0°C÷SET2; -58°F÷SET2) Sets the minimum acceptable value

for the set point2.

US2 Maxi mum set point2 limit: (SET2

÷110°C; SET2÷230°F) Set the maximum acceptable value

for set point2.

OdS2 Outputs activation delay of section 2 at start up: (0÷255 min) T his function is enabled at

the initial start up of the instrument and inhibits any output activation of the section 1 for the
period of time set in the parameter.

AC2 Anti-short cycle delay for co mpressor2: (0÷30 min) interval between the compressor2 stop

and the following restart.

Temperature2

Temperatature1