dixell XM440K, XM460K Installing And Operating Instructions

Dixell

Installing and Operating Instructions

XM440K
XM460K

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.

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An additional parameter “FSt” 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 “FSt”.

4. KEYBOARDS

There are 3 kind of keyboard available for the XM440K and XM460K controller:

T640: 6 Keys, horizontal shape (185x38mm).

1.2

• Check the supply voltage is correct before connecting the instrument.

• Do not expose to water or moisture: use the controller only within the operating limit s avoiding

• 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.”

• 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

• In case of applications in industrial environments, the use of mains filters (our mod. FT1) in parallel

SAFETY PRECAUTIONS

sudden temperature changes with high atmospheric humidity to prevent formation of
condensation

(see address) with a detailed description of the fault.

each other, without crossing or intertwining.
with inductive loads could be useful.

2. GENERAL DESCRIPTION

Models XM440K and XM460K are microprocessor based controllers suitable for applications on
medium or low temperature multiplexed cabinets made of up to 5 units. They can be inserted in a LAN
of up to 5 different sections which can operate, depending on the programming, as stand alone
controllers or following the commands coming from one of the other sections. XM440K is provided with
3 relay outputs to control the solenoid valve, defrost - which can be either electrical or hot gas and the
lights while XM460K is also provided with a relay output to control the evaporator fans. They are also
provided with three NTC probe inputs, one for temperature control, one to control the defrost end
temperature of the evaporator and the third, optional, for the display. There are two digital inputs (free
contact) : one devoted to the Energy saving activation and the other configurable by means of
parameter.
Two LAN output allows an easy connection between the controllers and a TTL connector for quick
programming by means of an Hot Key is also available. Direct serial output RS485 ModBUS-RTU
compatible and internal RTC are available as options.

3. CONTROLLING LOADS

3.1 THE SOLENOID VALVE

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 dif ferential
the solenoid valve is opened and then closed when the temperature reaches the set point value again.
In case of fault in the thermostat probe the opening and closing of the solenoid valve are timed through
parameters “COn” and “COF”.

3.2 DEFROST

Two defrost modes are available through the “tdF” parameter: defrost with electrical heater and hot gas
defrost. The defrost interval is control by means of parameter “EdF”: (EdF = rtc) the defrost is made in
real time depending on the hours set in the parameters Ld1..Ld8 on workdays and in Sd1…Sd8 in
holidays; (EdF = in) the defrost is made every “IdF” time, (EdF=Sd) the interval “IdF” is calculate through
Smart Defrost algorithm (only when the SOLENOID VALVE is ON and the evaporator temperature is
bigger than “SdF” parameter).
At the end of defrost the drip time is controlled through the “Fdt” parameter.
The starting of a defrost cycle can be operated locally (manual activation by means of the keyboard or
digital input or end of interval time) or the command can come from the Master defrost unit of the LAN.
In this case the controller will operate the defrost cycle following the parameters it has programmed but,
at the end of the drip time, will wait that all the other controllers of the LAN finish their defrost cycle
before to re-start the normal regulation of the temperature.
Every time any of the controller of the LAN begin a defrost cycle it issue the command into the network
making all the other controllers start their own cycle. This allows a perfect synchronisation of the defrost
in the whole multiplexed cabinet

3.3 CONTROL OF EVAPORATOR FANS (XM460K)

The fan control mode is selected by means of the “FnC” parameter:

C-n = running with the solenoid valve, OFF during the defrost;
C-y = running with the solenoid valve, ON during the defrost;
O-n = continuous mode, OFF during the defrost;
O-y = continuous mode, ON during the defrost;

V640: 6 Keys, vertical shape (64x100mm.

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.
By pressing it when the current time is displayed, it allows the User to re-set the current time
and three holidays.

Only C443 keyboard

By holding it pressed for 5s set the instrument in Stand By

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 give access to the “Section” menù.

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 current time is displayed and it permits the User to enter
Energy saving, Defrost and Clock parameter menu.

Only T640 and V640 keyboards
By holding it pressed for 3s the defrost is started.
By pressing it when the current time is displayed, it allows the User to set defrost times.

Switch ON and OFF the cold room light.

Only C443 keyboard

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

Only T640 and V640 keyboards
Switch ON and OFF the instrument.

KEY COMBINATIONS

+

+

+

+

To lock and unlock the keyboard.

To enter the programming mode.

C443: 4 Keys, horizontal sha pe

1592013000 XM440_460K GB XM440K & XM460K 1/1

Dixell

+

+

4.1 USE OF LEDS

Each LED function is described in the following table.

LED MODE Function

ON The SOLENOID VALVE is running
FLASHING

ON The fan is running
FLASHING

ON The defrost is enabled
FLASHING Drip time in progress
ON The controller is working in “ALL” mode
FLASHING The controller is working in remote virtual display mode
ON - ALARM signal

To exit the programming mode.

- Programming Phase (flashing with LED

- Anti-short cycle delay enabled

Programming Phase (flashing with LED

- In “Pr2” indicates that the parameter is also present in “Pr1”

Installing and Operating Instructions

)

)

4.2 HOW TO SEE THE MIN TEMPERATURE

1. Press and release the n key.

2. The “Lo” message will be displayed followed by the minimum temperature

.

4.3 HOW TO SEE THE MAX TEMPERATURE

4.4 HOW TO RESET THE MAX AND MIN TEMPERATURE RECORDED

To reset the stored temperature, when max or min temperature is displayed :

1. Press SET key until “rST” label starts blinking.

recorded.

3. By pressing the n key or waiting for 5s the normal display will be restored.

1. Press and release the o key.

2. The “Hi” message will be displayed followed by the maximum temperature
recorded.

3. By pressing the o key or waiting for 5s the normal display will be restored.

N.B. After the installation RESET the temperature stored .

4.5 HOW TO SEE AND MODIFY THE SET POINT

1. Push and immediately release the SET key: the display will show the Set point
value;

4.6 TO START A MANUAL DEFROST

2. The SET LED start 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.

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

Only C443 keyboard
Push the Light key for more than 3 seconds and a manual defrost will start

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2. Select “Pr2” parameter and press the “SET” key.

3. The “PAS” flashing message is displayed, shortly followed by “0 - -” with a flashing zero.

4. Use è or à to input the security code in the flashing digit; confirm the figure by pressing “SET”. The
security code is “321“.

5. If the security code is correct the access to “Pr2” is enabled by pressing “SET” on the last digit.

Another possibility is the following: after switching ON the instrument the user can push Set and DOWN
keys within 30 seconds.

NOTE: each parameter in “Pr2” can be removed or put into “Pr1” (user level) by pressing “SET” + n.
When a parameter is present in “Pr1” LED

4.9 HOW TO CHANGE THE PARAMETER VALUE

1. Enter the Programming mode.

2. Select the required parameter with o or n.

3. Press the “SET” key to display its value (

4. Use o or n to change its value.

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

To exit: Press SET + UP or wait 15s without pressing a key.
NOTE: the new programming is stored even when the procedure is exited by waiting the time-out.

4.10 HOW TO LOCK THE KEYBOARD

4.11 ON/OFF FUNCTIO N KEYBOARDS T640 AND V640

4.12 ON/OFF FUNCTION KEYBOARD C443

4.13 TO SEE THE PROBE VALUES

1. Enter in “Pr2” level.

2. with o or n, select “dP1” parameter for room probe, “dP2” for evaporator probe or “dP3” for

3. Press the “SET” key to display the relative probe value.

4. Press “SET” to move to the following parameter.

By pushing the ON/OFF key, the instrument shows “OFF” for 5 sec. and the ON/OFF LED is
switched ON.
During the OFF status, all the relays are switched OFF and the regulations are stopped; if a
monitoring system is connected, it does not record the instrument data and alarms.
N.B. During the OFF status the Light is active.

Keep the SET key pressed for more than 5 sec.
During the OFF status, all the relays are switched OFF and the regulations are stopped; if a
monitoring system is connected, it does not record the instrument data and alarms.
N.B. During the OFF status the Light is active.

display probe.

1. Keep the o or n keys pressed together for more than 3.

2. The “POF” message will be displayed and the keyboard is locked. At this
point it is only possible the viewing of the set point or the MAX o Min
temperature stored and to switch ON and OFF the light, the auxiliary
output and the instrument.

TO UNLOCK THE KEYBOARD

Keep the o and n keys pressed together for more than 3s.

is on.

and LED starts blinking).

5. THE SECTION MENU

This menu allows the user to access to a particular feature of the XM series related to the LAN (Local
Area Network) of controllers.
A single keyboard, depending on the programming of this menu, is able to control either the module of
the local section of the LAN or any of the other modules of the LAN acting as a remote virtual display.
The possibilities are:
LOC: the keyboard controls and display the value, the status and the alarms of the local section of the
LAN
ALL: the keyboard display the value and the status of the local section, but the command given by the
keyboard are effective on all the sections of the LAN. In case of alarm the writing “ASn” is shown, where
“n” is the number of the section in alarm.
SE1…Se5: the keyboard controls from remote the corresponding section (from 1 to 5 depending on LAN
address) of the LAN and display the value of the probes, the whole status and all the alarms of the
section. Only one of this remote control is allowed at the same time.

1. Push the o key for more than 3 seconds

2. The label corresponding to the section controlled by the keyboard will be
displayed.

3. With o or n key select the section you want to control.

4. Press “Set” key to confirm and exit

4.7 TO ENTER IN PARAMETERS LIST “PR1”

To enter the parameter list “Pr1” (user accessible parameters) operate as follows:

4.8 TO ENTER IN PARAMETERS LIST “PR2”

To access parameters in “Pr2”:

1. Enter the “Pr1” level.

1592013000 XM440_460K GB XM440K & XM460K 2/1

1. Enter the Programming mode by pressing the Set and DOWN key for few
start blinking).

seconds (

2. The instrument will show the first parameter present in “Pr1”

and

6. REAL TIME CLOCK FUNCTIONS

The following functions are available only if the Real Time Clock is present

6.1 TO SEE THE CURRENT TIME AND DAY

1. Push the n key for more than 3 seconds

2. The following messages are displayed:

Hur (hour); Min (Minute); dAY (day = giorno)

3. To exit push n key or wait 5 seconds

Dixell

6.2 TO SET THE TIME AND THE WEEKLY HOLIDAYS

1. Push the n key for more than 3 seconds

2. The current time is displayed.

6.3 TO SET THE DEFROST TIMES

7. PARAMETER LIST

REGULATION
Hy Differential: (0,1÷25,5°C; 1÷45°F): Intervention differential for set point, always positive. Solenoid

valve Cut IN is Set Point Plus Differential (Hy). Solenoid valve Cut OUT is when the temperature
reaches the set point.

LS Minimum set point limit: (-50,0°C

set point.

US Maximu m set point limit: (SET

point.

OdS Outputs activation delay at start up: (0÷255 min) This function is enabled at the init ial start up of

the instrument and inhibits any output activation for the period of time set in the parameter. (AUX
and Light can work)

AC Anti-short cycle delay: (0÷30 min) interval between the solenoid valve stop and the following

restart.

Con solenoid valve ON time with faulty probe: (0÷255 min) time during which the solenoid valve is

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

COF solenoid valve OFF time with faulty probe: (0÷255 min) time during which the solenoid valve is

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

DISPLAY
CF Temperature measurement unit: °C = Celsius; °F = Fahrenheit . When the measurement unit is

changed the SET point and the values of the regulation parameters have to be modified

rES Resolution (for °C): (in = 1°C; de = 0,1°C) allows decimal point display.

de = 0,1°C; in = 1 °C

Lod Local display : select which probe is displayed by the remote display (T850)

P1 = Thermostat probe
P2 = Evaporator probe
P3 = auxiliary probe
1r2 = difference between P1 and P2 (P1-P2)

DEFROST
tdF Defrost type:

rE = electrical heater (SOLENOID VALVE OFF)

in = hot gas (SOLENOID VALVE and defrost relays ON)
EdF Defrost mode:
rtc = Real Time Clock mode. Defrost time follows Ld1÷Ld8 parameters on workdays and

Sd1÷Sd8 on holidays.

in = interval mode. The defrost starts when the time “Idf” is expired.

Sd = Smart Defrost mode. The time IdF (interval between defrosts) is increased only when the

solenoid valve is active (even non consecutively) and only if the evaporator temperature is less

than the value in "SdF” (set point for SMARTFROST).
SdF Set point for SMARTFROST: (-30

IdF counting (interval between defrosts) in SMARTFROST mode.
dtE Defrost termination temperature: (-50,0÷110,0°C; -58÷230°F) (Enabled only when the

evaporator probe is present) sets the temperature measured by the evaporator probe which

causes the end of defrost.
IdF Interval between defrosts: (1÷120h) Determines the time interval between the beginning of two

defrost cycles.
MdF (Maximum) duration of defrost: (0÷255 min) When P2P = n, no evaporator probe, it sets the

defrost duration, when P2P = y, defrost end based on temperature, it sets the maximum length for

defrost.

dFd Display during defrost:
rt = real temperature;

it = temperature reading at the defrost start;

Set = set point;

dEF = “dEF” label;
dEG = “dEG” label;
dAd Defrost display time out: (0

the restarting of the real room temperature display.
Fdt Drain down time: (0÷60 min.) time interval between reaching defrost termination temperature and

the restoring of the control’s normal operation. This time allows the evaporator to eliminate w ater

drops that might have formed due to defrost.

dPO First defrost after start-up:
y = Immediately; n = after the IdF time

FANS (XM460K)
FnC Fan operating mode:

C-n = running with the solenoid valve, OFF during the defrost;

C-y = running with the solenoid valve, ON during the defrost;

O-n = continuous mode, OFF during the defrost;

O-y = continuous mode, ON during the defrost;
Fnd Fan delay after defrost: (0÷255 min) The time interval between the defrost end and evaporator

fans start.

1592013000 XM440_460K GB XM440K & XM460K 3/1

3. By pushing the SET key, setting the current hour, minutes, day and

the weekly holidays (up to 3) will be possible.

4. To exit, press SET + UP or wait 15s without pressing any key.

Only T640 and V640 keyboards

1. Push the n key for more than 3 seconds

2. The current time is displayed.

3. By pushing DEF key, the DEF led will start flashing and setting defrost time will

be possible.

4. To exit, press SET + UP or wait 15s without pressing any key.

÷SET; -58°F÷SET) Sets the minimum acceptable value for the

÷110°C; SET÷230°F) Set the maximum acceptable value for set

÷30 °C/ -22÷86 °F) evaporator temperature which allows the

÷255 min) Sets the maximum time between the end of defrost and

Installing and Operating Instructions

FSt Fan stop temperature: (-50÷110°C; -58÷230°F) setting of temperature, detected by evaporator

probe, above which the fan is always OFF.

ALARMS
ALC Temperature alarm configuration

rE = High and Low alarms related to Set Point
Ab = High and low alarms related to the absolute temperature.

ALU High temperature alarm setting:

ALC= rE, 0
ALC= Ab, ALL
when this temperature is reached and after the ALd delay time the HA alarm is enabled.
ALL Low temperature alarm setting:
ALC = rE , 0
ALC = Ab , - 50°C or -58°F ÷ ALU
when this temperature is reached and after the ALd delay time, the LA alarm is enabled,.

AFH Temperature alarm and fan differential: (0,1÷25,5°C; 1÷45°F) Intervention differential for
ALd Temp erature alarm del ay: (0÷255 min) time i nterval between the det ection of an alarm cond ition
dAO Delay of temperature alarm at start-up: (0min÷23h 50min) time interval between the detection of
EdA Alarm delay at the end of defrost: (0
tbA Buzzer and alarm relay silencing: by pushing one of the keypad buttons.

n= Only the Buzzer is silenced;
y= Buzzer and relay are silenced.

PROBE INPUTS
Ot Thermostat probe calibration: (-12.0÷12.0°C/ -21÷21°F) allows to adjust possible offset of the

OE Evaporator probe calibration: (-12.0
O3 Auxiliary probe calibration: (-12.0
P2P Evaporator probe presence:

P3P Auxiliary probe presence: n= not present; y= present.
HES Temperature increase during the Energy Saving cycle : (-30÷30°C / -54÷54°F) sets the

DIGITAL INPUTS
I1P Energy saving digital input polarity:

CL : the digital input is activated by closing the contact;
OP : the digital input is activated by opening the contact.
I2P Configurable digital input polarity:
CL : the digital input is activated by closing the contact;
OP : the digital input is activated by opening the contact

I2F Digital input operating mode: configure the digital input function:
EAL = generic alarm;
bAL = serious alarm mode;
dFr = Start defrost;
AUS = Relay AUX actuation;
onF = remote On/OFF.
Hdf = Holiday function.
did T ime interval/del ay for digital inpu t alarm:(0

bbC Type of keyboard: (4bb

TO SET CURRENT TIME AND WEEKLY HOLIDAYS
CbP Clock board presen t (y ÷ n) Presence of the RTC

Hur Current hour (0 ÷ 23 h)
Min Current minute (0 ÷ 59min)
dAY Current day (Sun ÷ SAt)
Hd1 First weekly holiday (Sun ÷ nu) Set the first day of the week which follows the holiday times.
Hd2 Second weekly holiday (Sun ÷ nu) Set the second day of the week which follows the holiday

Hd3 Third weekly holiday (Sun ÷ nu) Set the third day of the week which follows the holiday times.
N.B. Hd1,Hd2,Hd3 can be set also as “nu” value (Not Used).

TO SET DEFROST TIMES
Ld1÷Ld8 Workday defrost start (0 ÷ 23h 50 min.) These parameters set the beginning of the eight

Sd1÷Sd8 Holiday defrost start (0 ÷ 23h 50 min.) These parameters set the beginning of the eight

N.B. : T o disable a defrost cycle set it to “nu”(not used).

L.A.N. CONFIGURATION
LSn L.A.N. section numb er (1 ÷ 5) States the number of sections available in the L.A.N.

Lan L.A.N. serial address (1 ÷ LSn) Identifies the instrument address inside local network of
LSP L.A.N. set-point synchronisation

÷ 50°C or 90°F

÷ 110°C or 230°F

÷ 50 °C or 90°F

temperature alarm set point and fan regulation set point, always positive.
and the corresponding alarm signalling.
the temperature alarm condition after the instrument power on and the alarm signalling.
temperature alarm condition at the end of defrost and the alarm signalling.

thermostat probe.
evaporator probe.
evaporator probe.
n= not present: the defrost stops only by time; y= present: the defrost stops by temperature and

time.

increasing value of the set point during the Energy Saving cycle.

the pressure switch activation when I2F=PAL. If I2F=EAL or bAL (external alarms), “did” parameter
defines the time delay between the detection and the successive signalling of the alarm.

8bb= 8 keys

times.

programmable defrost cycles during workdays. Ex. When Ld2 = 12.4 the second defrost starts at

12.40 during workdays.
programmable defrost cycles on holidays. Ex. When Sd2 = 3.4 the second defrost starts at 3.40 on

holidays.

Ex. If Ld6=nu ; the sixth defrost cycle is disabled

multiplexed cabinet controller.

y= the section set-point, when modified, is updated to the same value on all the other sections
n= the set-point value is modified only in the local section

÷8bb min.) State the kind of keyboard used: 4bb=4 keys, 6bb= 6 keys,

÷255 min) Time interval between the detection of the

÷12.0°C/ -21÷21°F) allows to adjust possible offsets of the

÷12.0°C/ -21÷21°F) allows to adjust possible offsets of the

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÷255 min.) Time interval to calculate the number of

Dixell

Installing and Operating Instructions

LdS L.A.N. display synchroni sation

y= the value displayed by the section is sent to all the other sections

n= the set-point value is modified only in the local section
LOF L.A.N. On/Off synchronisation this parameter stat es if the On/Off command of the section will

act on all the other ones too.

y= the On/Off command is sent to all the other sections

n= the On/Off command acts only in the local section
LLi L.A.N. light synchronisation this parameter states if the light command of the section will act on

all the other ones too.

y= the light command is sent to all the other sections

n= the light command acts only in the local section
LAU L.A.N. AUX output synchronisation this parameter states if the AUX command of the section

will act on all the other ones too.

y= the light command is sent to all the other sections

n= the light command acts only in the local section
LES L.A.N. energy saving synchronisation this parameter states if the energy saving command of

the section will act on all the other ones too.

y= the Energy Saving command is sent to all the other sections.

n= the Energy Saving command acts only in the local section
LSd Remote probe display this parameter states if the section has to display the local probe value or

the value coming from another section.

y= the displayed value is the one coming from another section (which has parameter LdS = y).

n= the displayed value is the local probe one.

OTHER
Adr RS485 serial address (1÷247): Identifies the instrument address when connected to a Mo dBUS

compatible monitoring system.

dP1 Probe 1 value displaying shows the value measured by probe 1
dP2 Probe 2 value displaying shows the value measured by probe 2
dP3 Probe 3 value displaying shows the value measured by probe 3
Rel Release software: (read only) Software version of the microprocessor.
Ptb Parameter table: (read only) it shows the original code of the dIXEL parameter map.
Pr2 Access to the protected parameter list (read only).

8. DIGITAL INPUTS

The XM series can support up to 2 free of voltage contact digital inputs. One is always configured as
energy saving while the second is programmable in six different configurations by the “I2F” parameter.

8.1 ENERGY SAVING INPUT

The Energy Saving function allows to change the set point value as the result of the SET+ HES
(parameter) sum. This function is enabled until the digital input is activated.

8.2 CONFIGURABLE INPUT - GENERIC ALARM (EAL)

As soon as the digital input is activated the unit will wait for “did” time delay before signalling the “EAL”
alarm message. The outputs status don’t change. The alarm stops just after the digital input is de­activated.

8.3 CONFIGURABLE INPUT - SERIOUS ALARM MODE (BAL)

When the digital input is activated, the unit will wait for “did” delay before signalling the “BAL” alarm
message. The relay outputs are switched OFF. The alarm will stop as soon as the digital input is de­activated.

8.4 CONFIGURABLE INPUT - START DEFROST (DFR)

It executes a defrost if there are the right conditions. After the defrost is finished, the normal regulation
will restart only if the digital input is disabled otherwise the instrument will wait until the “Mdf” safety time
is expired.

8.5 CONFIGURABLE INPUT - RELAY AUX ACTUATION (AUS)

This function allows to turn ON and OFF the auxiliary relay by using the digital input as external switch.

8.6 CONFIGURABLE INPUT - REMOTE ON/OFF (ONF)

This function allows to switch ON and OFF the instrument.

8.7 CONFIGURABLE INPUT - HOLIDAY FUNCTION (HDF)
In Holiday function Energy saving and defrost cycles follow holiday times. (Sd1…Sd8)

8.8 DIGITAL INPUTS POLARITY
The digital inputs polarity depends on “I1P” and “I2P” parameters.

CL : the digital input is activated by closing the contact.

OP : the digital input is activated by opening the contact

9. INSTALLATION AND MOUNTING

Power modules XM440K and XM460k shall be mounted in a panel with two or more screws and they
must be connected to the keyboards by means of a two-wire cable (∅ 1mm). The temperature range
allowed for correct operation is 0 - 60 °C. Avoid places subject to strong vibrations, corrosive gases,
excessive dirt or humidity. The same recommendations apply to probes. Let the air circulate by the
cooling holes.

9.1 T640 - CUT OUT
T640 keyboard shall be mounted on vertical panel, in a 150x31 mm hole, and fixed using two screws ∅

3 x 2mm. To obtain an IP65 protection grade use the front panel rubber gasket (mod. RG-L).

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1592013000

+1

165

-1

+0.5

150

-0

-0

+0.5

31

Ø3 x2

9.2 T640 MOUNTING WITH KEYBOARD COVER OPENING DOWNWARD

2

CLICK!

1

3

1

2

3

1

9.3 T640 MOUNTING WITH KEYBOARD COVER OPENING UPWARD

1

CLICK!

2

2

3

1

2

3

1

9.4 V640 - CUT OUT
V640 keyboard shall be mounted on vertical panel, in a 72x56 mm hole, and fixed using screws ∅ 3 x

2mm. To obtain an IP65 protection grade use the front panel rubber gasket (mod. RGW-V).

9.5 C443 - CUT OUT

C443 keyboard shall be mounted on vertical panel, in a 29x71 mm hole, and fixed using the special

brackets supplied

1592013000 XM440_460K GB XM440K & XM460K 4/1

Dixell

A

10. ELECTRICAL CONNECTIONS

The controller of XM series are provided with screw terminal block to connect cables with a cross
section up to 2,5 mm
the keyboard. Other inputs, power supply and relays connections are provided with Faston connection
(6,3mm). Heat-resistant cables have to be used. Before connecting cables make sure the power supply
complies with the instrument’s requirements. Separate the probe cables from the power supply cables,
from the outputs and the power connections. Do not exceed the maximum current allowed on each
relay, in case of heavier loads use a suitable external relay.

10.1 PROBE CONNECTIONS

The probes shall be mounted with the bulb upwards to prevent damages due to casual liquid infiltration.
It is recommended to place the thermostat probe away from air streams to correctly measure the
average room temperature. Place the defrost termination probe among the evaporator fins in the coldest
place, where most ice is formed, far from heaters or from the warmest place during defrost, to prevent
premature defrost termination.

11. RS485 SERIAL LINE

XM440K and XM460K are provided (on request) of a direct RS485 connection that allow the unit, to be
linked to a network line ModBUS-RTU compatible as the dIXEL monitoring system XJ500 (Version 3.3).
The same TTL connector is used to upload and download the parameter list of the “HOT KEY“. The
instruments can be ordered wit the serial output RS485(Optional).

12. USE OF THE PROGRAMMING “HOT KEY “

The XM units can UPLOAD or DOWNLOAD the parameter list from its own E2 internal memory to the

“Hot Key” and vice-versa through a TTL connector.

12.1 DOWNLOAD (FROM THE “HOT KEY” TO THE INSTRUMENT)

1. Turn OFF the instrument by means of the ON/OFF key ,insert the “Hot Key” and then turn the

unit ON.

2. Automatically the parameter list of the “Hot Key” is downloaded into the controller memory, the

“DoL” message is blinking. After 10 seconds the instrument will restart working with the new
parameters.

At the end of the data transfer phase the instrument displays the following messages:
“end “ for right programming.
The instrument starts regularly with the new programming.
“err” for failed programming.

In this case turn the unit off and then on if you want to restart the download again or remove the
“Hot key” to abort the operation.

12.2 UPLOAD (FROM THE INSTRUMENT TO THE “HOT KEY”)

1. When the XM unit is ON, insert the “Hot key” and push è key; the "uPL" message appears.

2. The UPLOAD begins; the “uPL” message is blinking.

3. Remove the “Hot Key”.
At the end of the data transfer phase the instrument displays the following messages:
“end “ for right programming.

“err” for failed programming. In this case push “SET” key if you want to restart the programming
again or remove the not programmed “Hot key”.

13. ALARM SIGNALS

The alarm signals displayed by the keyboard are divided into 2 groups:

1. the local alarms, which involves all the alarm related to the section directly controlled by the

keyboard

2. Remote alarms, which involves the alarms related to LAN
The alarm message is displayed until the alarm condition is recovery.
All the alarm messages are showed alternating with the room temperature except for the “P1” which is
flashing.
To reset the “EE” alarm and restart the normal functioning press any key, the “rSt” message is displayed
for about 3s.

13.1 LOCAL ALARMS

Message Cause Outputs

“P1” Thermostat probe failure Alarm output ON; SOLENOID VALVE output according
“P2” Evaporator probe failure Alarm output ON; Other outputs unchanged

“P3” Auxiliary probe failure Alarm output ON; Other outputs unchanged
“HA” Maximum temperature

“LA” Minimum temperature

“EE” Data or memory failure Alarm output ON; Other out puts unchanged
“EAL” External alarm Alarm output ON; Other outputs unchanged
“BAL” Serious external alarm Alarm output ON; Other outputs OFF

“rtc” Real time clock alarm Alarm output ON; Other outputs unchanged; Defrosts according to

“rtF” Real time clock failure

1592013000 XM440_460K GB XM440K & XM460K 5/1

2

for the connection of RS485(optional), the LAN, the probes, the digital inputs and

to “COn” and “COF”

alarm
alarm

alarm

Alarm output ON; Other outputs unchanged
Alarm output ON; Other outputs unchanged

par. “IdF”

larm output ON; Other outputs unchanged; Defrosts according to

par. “IdF

Installing and Operating Instructions

13.2 REMOTE ALARMS
Message Cause

“ASn” Section n is in alarm with n = LAN address of the section (parameter “Lan”). This alarm

happen when the keyboard is set al “ALL”. This is a generic signal that the section is alarm,

to get detailed information about it set the keyboard to control that section.
“nLn” No link alarm section n with n = LAN address of the section (parameter “Lan”)
“nLn” No link alarm when displaying a remote probe. This alarm appears when the keyboard is

displaying a remote probe (parameter LdS = y)

“rdE” Remote virtual display error. More than one keyboards are set to control remote sections

13.3 SILENCING BUZZER / ALARM RELAY OUTPUT

If “tbA = y”, once the alarm signal is detected the buzzer and the relay are is silenced by pressing any
key.
If “tbA = n”, only the buzzer is silenced while the alarm relay is on until the alarm condition recovers.
Buzzer is mounted in the T640 and V640 keyboards and it’s an option.

13.4 “EE” ALARM

The dIXEL instruments are provided with an internal check for the data integrity. Alarm “EE” flashes
when a failure in the memory data occurs. In such cases the alarm output is enabled.

13.5 ALARM RECOVERY

Probe alarms : “P1” (probe1 faulty), “P2” and “P3”; they automatically stop 10s after the probe restarts
normal operation. Check connections before replacing the probe.
Temperature alarms “HA” and “LA” automatically stop as soon as the thermostat temperature returns to
normal values or when the defrost starts.
External alarms “EAL”, “BAL” stop as soon as the external digital input is disabled.
No link akarms “nLn” and “nLn” automatically stop after the connection with the section is restored.
“RdE” alarm automatically stop when only one keyboard is set as remote virtual display again

14. TECHNICAL DATA

V640 and T640 keyboards

Housing: self extinguishing ABS
Case: facia 38x185 mm; depth 23mm
Mounting : panel mounting in a 150x31 mm panel cut-out with t w o screws. Ø

holes 165mm

Protection: IP20
Frontal protection: IP65 with frontal gasket mod RG-L (opti onal)

Connections: Screw terminal block ≤
Power supply: from power module
Display: 3 digits, red LED, 14,2 mm high
Optional output: buzzer

C443 keyboards

Housing: self extinguishing ABS
Case: frontal 32x74 mm; depth 23mm
Mounting: panel mounting in a 71x29 mm panel cut-out
Frontal protection: IP65
Connections: Screw terminal block ≤ 2,5 mm2 heat-resista nt wiring
Power supply: from power module
Display: 3 digits, red LED, 14,2 mm high.
Optional output: buzzer

Power modules XM440K & XM460K

Case:
“OS”: open board 132x 94 mm; height: 40mm.
“GS”: case 155x114; height 70mm. Self extinguishing ABS. IP55
Connections: Screw terminal block ≤ 2,5 mm2 heat-resistant wiring and 6,3mm Faston
Power supply: 230Vac or 110Vac
Power absorption: 10VA max
Inputs: 3 NTC probes
Digital inputs: 2 free voltage
Solenoid Valve: relay SPST 8(3) A, 250Vac
light: relay SPST 16(6) A, 250Vac
fans: relay SPST 8(3) A, 250Vac
defrost: relay SPST 20(8) A, 250Vac
Serial output : RS485 optional
Communication protocol: ModBUS - RTU
Data storing: on the non-volatile memory (EEPROM)
Internal clock back-up: 24 hours
Kind of action: 1B
Pollution grade: normal
Software class: A
Operating temperature: 0÷60 °C
Storage temperature: -25÷60 °C
Relative humidity: 20
Measuring and regulation range:
NTC probe: -40÷110°C (-58÷230°F)
Resolution: 0,1 °C or 1°C or 1 °F (selectable )
Accuracy (ambient temp. 25°C): ±0,5 °C ±1 digit

2,5 mm2 heat-resistant wiring

± 10%

÷85% (no condensing)

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3 x 2mm. Distance between the

Dixell

15. CONNECTIONS

15.1 XM440K

Comp.

8A

250Vac

XM440K

+

RS 485

-

15.2 XM460K

-

+

+

Lan

Lan

Fan

8A

250Vac

-

Hot Key
for programming

Display

Comp.

250Vac

Room

8A

XM460K

+

RS 485

-

-

+

+

Lan

Lan

16. DEFAULT SETTING VALUES

Label Name Range Default XM440 XM460

REGULATION °C/°F Level Level
Set Set point LS÷US -5/23 Pr1 Pr1
Hy Differential 0,1÷25,5 °C / 1÷45°F 2/4 Pr1 Pr1
LS Minimum set point -50,0°C÷SET / -58°F÷SET -30/-22 Pr2 Pr2
US Maximum set point SET ÷ 110°C / SET ÷ 230°F 20/68 Pr2 Pr2
OdS Outputs activation delay at start up 0÷255 min. 1 Pr2 Pr2
AC Anti-short cycle delay 0÷30 min. 1 Pr1 Pr1
COn solenoid valve on time with faulty

probe

COF solenoid valve off time with faulty

probe
DISPLAY
CF Temperature measurement unit °C ÷ °F °C/°F Pr2 Pr2
rES Resolution (integer/decimal point) in ÷ de de Pr1 Pr1
Lod Local display P1 ÷ P2 ÷ P3 ÷ 1r2 P1 Pr2 Pr2
DEFROST
tdF Defrost type rE, in rE Pr1 Pr1
EdF Defrost mode rtc, In, Sd In Pr2 Pr2
SdF Set point for SMART DEFROST -30 ÷ +30°C / -22÷+86°F 0 Pr2 Pr2
dtE Defrost termination temperature

(1°Evaporator)
IdF Interval between defrost cycles 1÷120h 6 Pr1 Pr1
MdF (Maximum) length for 1° defrost 0÷255 min. 30 Pr1 Pr1
dFd Displaying during defrost rt, it, SEt, dEF, dEG it Pr2 Pr2
dAd MAX display delay after defrost 0÷255 min. 30 Pr2 Pr2

1592013000 XM440_460K GB XM440K & XM460K 6/1

-

Hot Key
for programming

Display

Room

-50,0÷110°C /-58÷230°F 8/46 Pr1 Pr1

Installing and Operating Instructions

Label Name Range Default XM440 XM460

Fdt Draining time 0÷60 min. 0 Pr2 Pr2
dPO First defrost after start up n ÷ y n Pr2 Pr2
FANS
FnC Fans operating mode C-n, C-y, O-n, O-y O-n N.A. Pr2

Light

Defrost

16A

250Vac

250Vac

Evaporator

Light

Defrost

16A

250Vac

250Vac

Evaporator

0÷255 min. 15 Pr2 Pr2
0÷255 min. 30 Pr2 Pr2

20A

20A

Conf.

Input

Conf.

Input

Line

Energy

saving

Line

Energy

saving

+

Keyboard

-

+

Keyboard

-

Fnd Fans delay after defrost 0÷255 min. 10 N.A. Pr2
FSt Fans stop temperature -50,0÷110°C / -58÷230°F 2/35 N.A. Pr2
ALARMS
ALC Temperature alarms configuration rE÷Ab rE Pr2 Pr2
ALU MAXIMUM temperature alarm -50,0÷110°C/-58÷230°F 10/20 Pr1 Pr1
ALL minimum temperature alarm -50,0÷110°C/ -58÷230°F 10/20 Pr1 Pr1
AFH Temperature alarm and fan

differential
ALd Temperature alarm delay 0÷255 min. 15 Pr2 Pr2
dAO Delay of temperature alarm at start

up
EdA Alarm delay at the end of defrost 0÷255 min. 30 Pr2 Pr2
tBA Alarm relay silencing y ÷ n y Pr2 Pr2
ANALOGUE INPUTS
Ot Thermostat probe calibration -12,0÷12,0°C / -21÷21°F 0 Pr1 Pr1
OE Evaporator probe calibration -12,0÷12,0°C / -21÷21°F 0 Pr2 Pr2
O3 Auxiliary probe calibration -12,0÷12,0°C / -21÷21°F 0 Pr2 Pr2
P2P Evaporator probe presence n ÷ y y Pr2 Pr2
P3P Auxiliary probe presence n ÷ y n Pr2 Pr2
HES Temperature increase during the

Energy Saving cycle

DIGITAL INPUTS
I1P Energy Saving switch polarity CL÷OP CL Pr2 Pr2
I2P Configurable digital input polarity CL÷OP CL Pr2 Pr2
i2F Digital input configuration EAL, bAL, PAL,

dId Digital input alarm delay 0÷255 min. 5 Pr2 Pr2
bbc Type of keyboard 4bb ÷ 8bb 6bb Pr2 Pr2

TIME AND WEEKLY HOLIDAYS
CbP Clock Board presence n ÷ y n Pr2 Pr2
Hur Current hour 0 ÷ 23 0 Pr2 Pr2
Min Current minute 0 ÷ 59 0 Pr2 Pr2
dAY Current day Sun ÷ SAt Sun Pr2 Pr2
Hd1 First weekly holiday Sun ÷ SAt – nu nu Pr2 Pr2
Hd2 Second weekly holiday Sun ÷ SAt – nu nu Pr2 Pr2
Hd3 Third weekly holiday Sun ÷ SAt – nu nu Pr2 Pr2

ENERGY SAVING TIMES
ILE Energy Saving cycle start during

workdays

dLE Energy Saving cycle length during

workdays

ISE Energy Saving cycle start on

holidays

dSE Energy Saving cycle length on

holidays

HES Temperature increase during the

Energy Saving cycle
DEFROST TIMES
Ld1 1st workdays defrost start 0 ÷ 23h 50 min. - nu 6.0 Pr2 Pr2
Ld2 2nd workdays defrost start 0 ÷ 23h 50 min. - nu 13.0 Pr2 Pr2
Ld3 3rd workdays defrost start 0 ÷ 23h 50 min. - nu 21.0 Pr2 Pr2
Ld4 4th workdays defrost start 0 ÷ 23h 50 min. - nu nu Pr2 Pr2
Ld5 5th workdays defrost start 0 ÷ 23h 50 min. - nu nu Pr2 Pr2
Ld6 6th workdays defrost start 0 ÷ 23h 50 min. - nu nu Pr2 Pr2
Ld7 7th workdays defrost start 0 ÷ 23h 50 min. - nu nu Pr2 Pr2
Ld8 8th workdays defrost start 0 ÷ 23h 50 min. - nu nu Pr2 Pr2
Sd1 1st holiday defrost start 0 ÷ 23h 50 min. - nu 6. 0 Pr2 Pr2
Sd2 2nd holiday defrost start 0 ÷ 23h 50 min. - nu 13.0 Pr2 Pr2
Sd3 3rd holiday defrost start 0 ÷ 23h 50 min. - nu 21.0 Pr2 Pr2
Sd4 4th holiday defrost start 0 ÷ 23h 50 min. - nu nu Pr2 Pr2
Sd5 5th holiday defrost start 0 ÷ 23h 50 min. - nu nu Pr2 Pr2
Sd6 6th holiday defrost start 0 ÷ 23h 50 min. - nu nu Pr2 Pr2
Sd7 7th holiday defrost start 0 ÷ 23h 50 min. - nu nu Pr2 Pr2
Sd8 8th holiday defrost start 0 ÷ 23h 50 min. - nu nu Pr2 Pr2

LAN CONFIGURATION
LSn L.A.N. section number 1 ÷ 5 1 Pr2 Pr2
Lan L.A.N. serial address 1 ÷ LSn 1 Pr2 Pr2
LSP L.A.N. Set-point synchronisation n ÷ y n Pr2 Pr2
Lds L.A.N. display synchronisation n ÷ y n Pr2 Pr2
LOF L.A.N. On/Off synchronisation n ÷ y n Pr2 Pr2
LLi L.A.N. Light synchronisation n ÷ y n Pr2 Pr2
LAU L.A.N. AUX output synchronisation n ÷ y n Pr2 Pr2
LES L.A.N. Energy Saving

synchronisation

LSd Remote probe display n ÷ y n Pr2 Pr2

OTHER
Adr RS485 Serial address 0÷247 1 Pr1 Pr1
dP1 Probe 1 value display - - - - - - Pr2 Pr2

0,1÷25,5 °C/ 1÷45°F 2/4

0 ÷ 23h 50 min. 1,3 Pr2 Pr2

-30÷30°C / -54÷54°F 0 Pr2 Pr2

dFr, AUS, ES, OnF

0 ÷ 23h 50 min. 0 Pr2 Pr2
0 ÷ 24h 00 min. 0 Pr2 Pr2
0 ÷ 23h 50 min. 0 Pr2 Pr2
0 ÷ 24h 00 min. 0 Pr2 Pr2

-30÷30°C / -54÷54°F 0 Pr2 Pr2

rel.1.0 –07/03/2002 - cod.

1592013000

EAL Pr2 Pr2

n ÷ y n Pr2 Pr2

Dixell

Label Name Range Default XM440 XM460

dP2 Probe 2 value display - - - - - - Pr2 Pr2
dP3 Probe 3 value display - - - - - - Pr2 Pr2
rEL Software release - - - - - - Pr2 Pr2
Ptb Map code - - - - - - Pr2 Pr2
Pr2 Access parameter list - - - - - - Pr2 Pr2

Dixell s.r.l. Via dell’Industria, 27 - 32010 Z.I Pieve d’Alpago (BL) ITALY
tel. +39 - 0437 - 98 33 - fax +39 - 0437 - 98 93 13
E-mail:[e-mail] - http://www.dixell.com

Installing and Operating Instructions

rel.1.0 –07/03/2002 - cod.

1592013000

1592013000 XM440_460K GB XM440K & XM460K 7/1