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.

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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