Emerson Dixell XM668D Installing And Operating Instructions

The

CX660 keyboard

shall

LSt

uSt

CPP

CHd

Sr

0

Manual settings

Par Par Par Par Par 1 Alco EX4

-

EX5-EX6 5 75 50 10 500 2 Alco EX7

10

160 75 25

500 3 Alco EX8 500 step/s

10

260 80 50

500 4 Danfoss ETS

-

25/50 7 262 10 10

300 5 Danfoss ETS

-

100 10 353 10 10 300

6 Danfoss ETS

-

10

7 Sporlan SEI .5

to 11 0 159 16 5 200

8 Sporlan SER 1.5

to

5

9 Sporlan SEI

30 0 319 16 5

200 10 Sporlan SER(I) G,J,K

0

250 12 5 200 11 Sporlan SEI

-50 0

638 16 5 200 12 Sporlan SEH(I)

-

100 0 638 16 5 200 13 Sporlan SE

H(I)-

175 0 638 16 5 200

SPORLAN

45 BLUE WHITE BLACK

46

BROWN

BLACK

WHITE 47 BLACK

RED RED 48 W

HITE GREEN

GREEN

4. WIRING DIAGRAM AND CONNECTIONS

CONTROLLERS FOR MULTIPLEXED CABINETS

WITH STEPPER DRIVER INSIDE

XM668D

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

2. GENERAL DESCRIPTION .............................................................................................................................. 1

3. INSTALLATION AND MOUNTING.................................................................................................................. 1

4. WIRING DIAGRAM AND CONNECTIONS..................................................................................................... 1

5. USER INTERFACE.......................................................................................................................................... 3

6. HOW TO PROGRAM THE PARAMETERS (PR1 AND PR2) ........................................................................ 3

7. FAST ACCESS MENU .................................................................................................................................... 3

8. MENU FOR MULTIMASTER FUNCTION: SEC ............................................................................................. 3

9. COMMISSIONING ........................................................................................................................................... 4

10. DISPLAY MESSAGES .................................................................................................................................... 5

11. USE OF THE PROGRAMMING “HOT KEY“ .................................................................................................. 5

12. CONTROLLING LOADS.................................................................................................................................. 5

13. TECHNICAL DATA .......................................................................................................................................... 7

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 operati ng

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 fault y 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 su pply 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

The XM668D is a microprocessor based controller for multiplexed cabinets suitable
for applications on medium or low temperature. It can be inserted in a proprietary
LAN with up to 8 different sections which can operate, depending on the
programming, as stand alone controllers or following the commands coming from the
other sections. The XM668D is provided with 4 relay outputs to control the solenoid
valve, defrost - which can be either electrical or hot gas - the evaporator fans, the
lights, and with the stepper valve driver. The device is also equipped with six probe
inputs: for temperature control, for control the defrost end temperature, for display
and the fourth can be used for application with virtual probe or for inlet/outlet air
temperature m easurement. Moreover, fifth and sixth probe are used to evaluate and
control the superheat. Finally, the XM668D is equipped with the three digital inputs
(free contact) fully configurable by parameters.
The device is equipped with the HOTKEY connector that perm its to be programmed
in a simple way. The optional direct serial output RS485 (ModBUS compatible)
permits a simple XWEB interfacing. RTC is available as options. The HOT-KEY
connector can be used to connect X-REP display (Depending on the model).

3. INSTALLATION AND MOUNTING

This device can operate without any user interface, but normal application is with
Dixell CX660 keyboard.

be mounted on vertical panel,
in a 29x71 mm hole, and
fixed using the special
bracket supplied as shown in
fig. 1a/1b. The temperature
range allowed for correct
operation is 0 to 60°C. Avoid
places subject to strong
vibrations, corrosive gases,
excessive dirt or humidity.
The same recommendations
apply to probes. Let air
circulate by the cooling holes.

Figure 1a

Figure 1b

4.1 IMPORTANT NOTE

XM device is provided with disconnectable terminal block to connect cables with a

cross section up to 1.6 m m2 for all the low voltage connection: the RS485, the LAN,
the probes, the digital inputs and the keyboard. Other inputs, power supply and relay
connections are provided with screw terminal block or fast-on connection (5.0 mm).
Heat-resistant cables have to be used. Before connecting cables make sure the
power suppl y 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. N.B. Maximum current allowed for all the loads is 16A.
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.

4.2 XM668D

4.3 VALVE CONNECTIONS AND CONFIGURATION

WARNINGS

1. T o avoid possible problems, before connecting the valve configure the
driver by making the right changes on the parameters. Select the kind of
motor (tEU parameter) and check if the valve is present in tEP
parameter table reported here below.

2. T he max distance between an XM controller and a valve must not

exceed 10 m. To avoid any problems, use only shielded cables with

!!!!! In any case, the unique and valid reference has to be considered the
datasheet made by valve manufacturer. Dixell cannot be considered
responsible in case of valve damaging due to wrong settings!!!!!!

tEP

If you can see your valve on the table, please select the valve through tEP
parameter. In this way, you can be sure of a right configuration. About the

connection, please pay attention to the following table to have a quick reference on
the connection mode for valves of different manufacturer

4 WIRES VALVES (BIPOLAR)

section greater than or equal to 0.325 mm² (AWG22).

Model

250/400

20

Connection

numbering

(steps*10)

(steps*10)

11 381 10

0 159 12

ALCO

EX4/5/6/7/8

(mA*10)

SEI-SEH-

SER

(mA*10)

DANFOSS

ETS

(step/s)

300

200

Figure 1c

1592023040 XM668D GB r1.1 2011.07.05.doc XM668D 1/14

Connection

45 ORANGE

ORANGE

46

RED RED 47 YELLOW

YELLOW

48

BLACK

BLACK

49 –

Common

GRAY GRAY

Temperature probe:

Pb6

terminals

[19] -

[20] without

5-6 WIRES VALVES (UNIPOLAR)

numbering

AFTER M AKING THE CONNECTION, PLEASE SWITCH OFF AND ON THE
CONTROLLER IN ORDER TO BE SURE OF THE RIGHT POSITIONING OF THE
VALVE.

SPORLAN SAGINOMIYA

4.4 ABSOLUTE MAXIMUM POWER

XM668D is able to dri ve a wide range of stepper valves, on the following table are

indicated the maximum values of current that the actuator can supply to the stepper
wiring. The TF20D dIXEL transformer has to be used.

NOTE: the electrical power absorption of the valve can be unrelated to refrigeration
power that valve has. Before using the actuator, please read the technical manual of
the valve supplied by the manufacturer and check the maximum current used to drive
the valve in order to verify that they are lower than those indicated below.

BIPOLAR VALVES

UNIPOLAR VALVES

TYPE

VALVE

(5-6 wires)

(4 wires)

Maximum Current 0.9A

Maximum Current 0.33A

4.5 KEYBOARD DISPLAY CX660

Polarity:

Terminal [34] [-]
Terminal [35] [+]

Use shielded cable in

The XM668D board can operate also without keyboard.

case of long distance.

4.6 SYNCHRONIZED DEFROST – MAXIMUM 8 SECTIONS

Follow next steps to create a LAN connection, which is a necessary condition to
perform synchronized defrost (also called master-slave functioning):

1) Connect a shielded cable between terminals [38] [-] and [39] [+] for a maximum
of 8 sections;

2) The value of parameter Adr is the number to identif y each electronic board.
Address duplication is not permitted, in this case the synchronized defrost
and the communication with monitoring system is not guaranteed (the Adr is
also the ModBUS address). For example, a correct configuration could be the
following:

If the LAN is well connected, the green LED will be ON. If the green LED blinks
then the connection is wrongly configured.

4.7 SENSORS FOR SUPERHEAT CONTROL

any polarity.

Select the kind of sensor with P6C parameter.

Pressure transducer: Pb5 terminals:
[21] = input of the signal; [22] = Power Supply for
4to20mA transducer; [20] = GND; [23] = +5Vdc power

Select the configuration of the transducer with parameter P5C.

supply for ratiometric pressure transducer.

4.8 HOW TO USE ONLY ONE PRESSURE TRANSDUCER ON MULTIPLEXED

APPLICATIONS

By pressing UP ARROW button, the user will be able to enter a fast selection menu
and to read the value of the following parameters:

dPP = measured pressure (only on master device);
dP5 = value of temperature obtained from pressure temperature conversion;
rPP = pressure value read from remote location (only for slave devices).

Examples of error messages:

dPP = Err  the local transducer read a wrong value, the pressure is out of the

bounds of the pressure transducer or the P5C parameter is wrong. Check all
these options and eventually change the transducer;

rPF  the remote pressure transducer is on error situation. Check the status of the

onboard GREEN LED: if this LED is OFF the LAN is not working, otherwise
check the remote transducer.

LAST CHECKS ABOUT SU PERHEAT

On the fast access menu:

dPP is the value read by the gauge;
dP6 is the value read by the temperature probe, temperature of the gas on the outlet

section of the evaporator;
SH is the value of the superheat. The n A or Err messages mean that the superheat
has no sense in that moment and its value is not available.

4.9 HOW TO CONNECT MONITORING SYSTEM

1) Terminals [36] [-] and [37] [+].

2) Use shielded twisted cable. For
example Belden® 8762 o 8772 or cat 5
cables.

3) Maximum distance 1Km.

4) Don’t connect the shield to the earth or

to GND terminals of the device, avoid
accidental contacts by using insulating

Only one device for each LAN has to be connected to the RS485 connection.

The value of parameter Adr is the number to identify each electronic board. Address
duplication is not permitted, in this case the synchronized defrost and the

tape.

communication with monitoring system is not guaranteed (the Adr is also the
ModBUS address).

4.10 DIGITAL INPUTS

1) The terminals from [30] to [33] are all
free of voltage;

2) Use shielded cable for distance higher
than one meter;

For each input, has to be configured: the
polarity of activation, the function of the input
and the delay of signaling.

The parameters to perform this configuration are i1P, i1F, i1d respectively for
polarity, functioning and delay. The i1P can be: cL = active when closed; oP = active
when opened. The i1F param eter can be: EAL = external alarm, bAL = serious lock
alarm, PAL = pressure switch alarm, dor = door switch, dEF = external defrost, AUS
= auxiliary activation command, LiG = light activation, OnF = board On/OFF, FHU =
don’t use this configuration, ES = day/night, HdY = don’t use this configuration. Then
there is i1d parameter for delay of activation. For the others digital inputs there are a
set of the same parameters: i2P, i2F, i2d, i3P, i3F, i3d.

4.11 ANALOG OUTPUT

 Selectable between 4 to 20mA and

0 to 10Vdc.

 Use CABCJ15 to perform the

It’s located near the terminal [39] on a 2-pin connector. It’s possible to use the output
to control anti-sweat heaters through a chopped phase controller XRPW500
(500watt) or family XV...D or XV...K.

connections

A working LAN connection is required (green LED lit on all XM668D boards of the
same LAN). Connect and configure a pressure transducer only on one XM668D of
the network. Afterwards, the value of pressure read by the unique transducer
connected will be available to each device connected to the same LAN.

1592023040 XM668D GB r1.1 2011.07.05.doc XM668D 2/14

DURING PROGRAMMING

: blink the measurement units of temperatu

re and

LIGHT relay

AUX relay

Manual defrost

ON/OFF

Press for 3

sec the

ON/OFF

button (if the function is

E

nergy

Saving

Press for 3

sec the

ON/OFF

button (if the function is

By press and release the

UP arrow

. The

duration

5. USER INTERFACE

5.1 DIRECT COMMAND INTERFACE

5.2 ICONS

With icon ON the
output is active, while
with blinking icon there
is a delay.

MEASUREMENT
UNIT

°C, Bar and (time)

are ON depending on
the selection.

Light →

Defrost →

Energy saving →

Generic alarm →

pressure

Cooling output

↓

AUX ← Auxiliary relay

← Multimaster Enabled

← Clock / time

← Fan

5.3 KEYBOARD COMMANDS

Single commands:

Double commands:

Press light button.
Press down arrow.
Press and hold for 3 sec the defrost button

enabled).

enabled).

Press and hold for about 3 sec to lock (Pon) or unlock (PoF) the
keyboard.

Pressed together to exit from programm ing mode or from menu; on
submenus rtC and EEV this combination allow to come back to
previous level.

Pressed together for 3 sec allow to access to first level of
programming mode.

5.4 HOW TO MODIFY THE SET POINT FOR AIR TEMPERATURE REGULATION

The thermostat set point is the value that will be used to regulate the air temperature.
The regulation output is controlled by the electronic valve or by the relay.

BEGIN

Value

modification

EXIT

or

In a ny case, it is possible to wait for about 10 sec to exit. In order to show the air
temperature set is sufficient to press and release the SET button, the value is
displayed for about 60 sec.

Press SET button for 3 sec, the measurement units
will blink together.

With the arrows it’s possible to change the value
within the LS and US parameters value.

By pressing SET it is possible to confirm the value
that will blink for about 2 sec.

6. HOW TO PROGRAM THE PARAMETERS (PR1 AND PR2)

The device provide 2 programming levels: Pr1 with direct access and Pr2 protected
with a password (intended for experts).

ACCESS
to Pr1

Select item

Show value

Modify

Confirm
and store

or

or

Press and hold for about 3 sec to have access to
the first programming level (Pr1).

Select the parameter or submenu using the arrows.

Press SET button.

Use the arrows to modify the value.

Press SET key: the value will blink for 3 sec, and
then the display will show the next parameter.

EXIT

Instantaneous exit from the programming mode,
otherwise wait for about 10 sec (without press any
button).

6.1 HOW TO HAVE ACCESS TO “PR2”

To enter Pr2 programming menu:

1. access the Pr1 menu by pressing both SET+DOWN keys for 3 sec, the first
parameter label will be showed;

2. press DOWN key untill the Pr2 label will be showed, then press SET key;

3. The blinking PAS label will be showed, wait some seconds;

4. Will be showed “0 - -” with blinking 0: insert the password [321] using the keys

UP and DOWN and confirming with SET key.

GENERAL STRUCTURE: The first two item rtC and EEV are related to submenus

with others parameters.

 SET+UP keys on rtC or EEV submenus allow coming back to parameter list,
 SET+UP keys on parameter list allow immediate exit.

6.2 HOW TO MOVE PARAMETER FROM PR1 TO PR2 AND VICE VERSA

Enter on Pr2; select the parameter; press both SET+DOWN keys; a left side LED ON
gives to the parameter the presence on Pr1 level, a left side LED OFF means that the
parameter is not present on Pr1 (only Pr2).

7. FAST ACCESS MENU

This menu contains the list of probes and some values that are automatically
evacuate by the board such as the superheat and the percentage of valve opening.
The values: nP or noP sta nds for probe not present or value not evacuate, Err value
out of range, probe damaged not connected or incorrectly configured.

Entering fast

access menu

of the menu in case of inactivity is about 3 min.
The values that will be showed depend on the
configuration of the board.

HM Access to clock menu or reset of the RTC alarm;

Use

arrows to

select an

entry,

then press

to see the

value or to

go on with

other value.

An Value of analog output;
SH Value of superheat. nA = not Available;
oPP Percentage of valve opening.
dP1 (Pb1) Value read by probe 1.
dP2 (Pb2) Value read by probe 2.

or

dP3 (Pb3) Value read by probe 3.
dP4 (Pb4) Value read by probe 4.
dP5 (Pb5) Temperature read by probe 5 or value obtained from

pressure transducer.

dP6 (Pb6) Value read by probe 6.
dPP Pressure value read by (Pb5) transducer.
rPP Virtual pressure probe, only on slave.
L°t Minimum room temperature;
H°t Maximum room temperature;
dPr Virtual probe for room temperature regulation [rPA and rPb];
dPd Virtual probe for defrost management [dPA and dPb];
dPF Virtual probe for fan management [FPA and FPb];
rSE Real thermoregulation set point: the value includes the sum of

SET, HES and/or the dynamic set point if the functions are

enabled.

Exit

Pressed together or wait the timeout of about 60

sec

8. MENU FOR MULTIMASTER FUNCTION: SEC

The function “section” SEC is enabled when icon is lit. It allows entering in the
remote programming mode, from a keyboard not ph ysically connected to the board,
through the LAN functionality.

1592023040 XM668D GB r1.1 2011.07.05.doc XM668D 3/14

Enter

Press

SET

and UP

together

or

wait about 10

XM6

x8D_1

XM6x8D_2

+

with

XM6x8D_3+

LSt

uSt

CPP

CHd

0

Manual

settings

Par Par Par Par Par 1 Alco EX4

-

EX5-EX6 5 75 50 10 500 2 Alco EX7

10

160 75 25

500 3 Alco EX8 500 step/s

10

260 80 50

500 4 Danfoss ETS

-

25/50 7 262 10 10

300 5 Danfoss ETS

-

100 10 353 10 10 300

6 Danfoss ETS

-

10

7 Sporlan

SEI .5 to 11 0

159 16 5 200

8 Sporlan SER 1.5

to

5

9 Sporlan SEI 30

0

319 16 5

200 10 Sporlan SER(I) G,J,K

0

250 12 5 200 11 Sporlan SEI

-50 0

638 16 5 200 12 Sporlan SEH(I)

-

100 0 638 16 5 200 13 Sporlan SEH(I)

-

175 0 638 16 5 200

Action

Enter
menu

Waiting
for action

section
list

Select
proper
function

Confirm

Exit menu

Button or

display

SEC

LOC

ALL

Or

SE1

SEn

SE8

Notes

Press UP arrow for about 3 sec, the icon will be
ON.
The menu to change the section will be entered. SEC
label will be displayed.

Press SET to confirm. The following list will be
available to select the proper network function.

To gain access only to the local device.

To gain access to all the devices connected to the

LAN.

To gain access to the device with 1st Adr (*)

…

To gain access to the device with 8th Adr (*)

Select and confirm an entry by pressing SET button.

seconds.
(*) The devices on the LAN are indexed by using the Adr parameter (in ascending
order).

EXAMPLES:

1. T o modify the same parameter values in all the devices connected to the LAN:

enter multim aster menu. Select and confirm ALL. Exit from multimaster menu.
Enter the programming menu and change the required parameter values.
The new values will be changed on all devices connected to the LAN.

2. T o modify a parameter value in the device with [Adr = 35]: find the relevant
indexed section (the one linked to [Adr = 35]). Enter multimaster menu. Select
and confirm this section from the multimaster menu. Exit from multimaster
menu. Enter the programming menu and change the required parameter value.

3. If the alarm nod is present: enter the multimaster menu. Select and confirm the
LOC section. Exit from multimaster menu.

AT THE END OF THE PROGRAMMING PROCEDURE, SELECT THE

SECTION “LOC”. IN THIS WAY THE ICON WILL BE SWITCHED OFF!!

9. COMMISSIONING

9.1 CLOCK SETTING AND RTC ALARM RESET

Parameter configuration: [CbP = Y] en able the clock, [EdF = rtC] enable the defrost
from rtc Ld1...Ld6.

BEGIN

Display

HM identify the clock RTC submenu; press

HUr = hour  press to confirm/modify

Display

Min = minutes  press to confirm/modify
…… don’t use others parameters if present.

EXIT

Note: the rtC clock menu is present also on the second level of parameters.
Warning: if the board shows the rtF alarm, the device has to be changed.

9.2 ELECTRONIC VALVE SETTINGS

Some parameters have to be checked:
[1] Superheat temperature probe: Ntc, Ptc, Pt1000 with parameter P6C. The
sensor has to be fixed at the end of the e vaporator.
[2] Pressure transducer: [4 to 20mA] or ratiometric P5C = 420 or 5Vr with
parameter P5C.
[3] Range of measurement: check the parameter of conversion PA4 and P20 that
are related to the transducer.
TRANSDUCER: [-0.5/7Bar] or [0.5/8Bar abs] the correct setup is relative pressure
with PA4 = -0.5 and P20 = 7.0. The [0.5/12Bar abs] the correct setup is relative
pressure with PA4 = -0.5 and P20 = 11.00.

Example of virtual pressure with unique [4 to 20mA] or [0 to 5V] transducer:

Param.

Adr

LPP

P5C

PA4

P20

[4] From EEV submenu: select the correct kind of gas with FTY parameter.
[5] Use the following parameters to setup the right valve driving, according to the

valve datasheet from the manufacturer.

without transducer

LPP = n LPP = Y LPP = n

LAN or not connect

the probe

Not used -0.5 bar Not used

Not used 7.0 bar Not used

UP arrow (press once) to access the fast access

Press for about 10 sec. The operation resets the RTC
alarm.

transducer

menu

without transducer

n n + 1 n + 2

P5C= 420 or 0-5V

LAN or not connect

the probe

tEU Type of Stepper motor: [uP-bP] it permits to select the kind of valve. uP = 5 -

6 wires unipolar valves; bP = 4 wires bipolar valves; !!!!! WARNING !!!!! by

changing this parameter the valve has to be reinitialized.

tEP Predefined valve selection: [0 to 10] if [tEP = 0] the user has to modify all

the parameters of configuration in order to use the valve. If tEP is different
from 0 the device performs a fast configuration of the following parameters:
LSt, uSt, Sr, CPP, CHd. To select the right number please read the following

table:

tEP

If tEP is different from 0 previous configuration of LSt, uSt, Sr, C PP and CHd are

Model

250/400

20

overwritten.

(steps*10)

(steps*10)

11 381 10

0 159 12

(mA*10)

(mA*10)

Sr (step/s)

300

200

LSt Minimum number of steps: [0 to USt] it permits to select the minimum

number of steps. At this number of steps the valve should be closed. So it’s
necessary the reading of manufacturer datasheet to set correctl y this
parameter. It’s the minimum number of steps to stay in advised range of
functioning. !!!!! WARNING !!!!! By changing this parameter the valve has

to be reinitialized. The device performs this procedure automatically and
restarts its normal functioning when the programming mode ends.

USt Maximum number of steps: [LSt to 800*10] it permits to select the maximum

number of steps. At this number of steps the valve should be completely
opened. Read the datasheet provided by manufacturer of the valve to set
correctly this parameter. It’s the maximum number of steps to stay in advised
range of functioning. !!!!! WARNING !!!!! By changing this parameter the

valve has to be reinitialized. The device performs this procedure
automatically and restarts its normal functioning when the programming
mode ends.

Sr Step rate [10 to 600 step/sec] it’s the maximum speed to change step without

losing precision (means without losing steps). It’s advised to stay under the
maximum speed.

CPP Current per phase (only bipolar valves): [0 to 100*10mA] it’s the maximum

current per phase used to drive val ve. It’s used only with bipolar valves.

CHd Holding current per phase (only bipolar valves): [0 to 100*10mA] it’s the

current per phase when the valve is stopped for more than 4 minutes. It’s used
only with bipolar valves.

9.3 ELECTRONIC VALVE FUNCTIONING

ON/OFF TEMPERATURE REGULATION [CrE = n]

1. The HY parameter is a differential [2°C default].

2. The temperature regulation is ON/OFF with valve stop at set point.

3. The superheat is regulated to be closer to its set point.

4. With more pauses normally also the humidity is bigger.

5. Regulation pauses can be realized using Sti and Std parameters (during these
pauses the valve is closed).

COUNTINUOUS REGULATION OF THE TEMPERATURE [CrE=Y] (with superheat
regulation):

1. The HY parameter becomes temperature band for PI control. A default good
value is 5°C.

2. The regulation of injection is continuous and the cooling output is always on.
The icon is always ON excluding the defrost phase.

3. The superheat is regulated following the SSH parameter.

4. Regulation pauses can be realized using Sti and Std parameters (during these
pauses the valve is closed).

5. Increasing the Int integral time it is possible to decrease the speed of reaction
of the regulator on the HY band.

COUNTINUOUS REGULATION OF THE TEMPERATURE [CrE=Y] (without
superheat regulation):

1. The HY parameters become temperature band for PI control. A default good
value is 5°C.

2. The regulation of injection is continuous and the cooling output is always on.
The icon is always ON excluding the defrost phase.

3. The superheat is not regulated because the valve is at the end of the
evaporator. At the beginning of the evaporator there is another valve.

4. Regulation pauses can be realized using Sti and Std parameters (during these
pauses the valve is closed).

5. Increasing the Int integral time it is possible to decrease the speed of reaction
of the regulator on the HY band.

9.4 SYNCHRONIZED DEFROST

The synchronized defrost allow to manage multiple defrost from different boards
connected through the LAN connection. In this way, the boards can perform
simultaneous defrosts with the possibility to end them in a synchronized way.

1592023040 XM668D GB r1.1 2011.07.05.doc XM668D 4/14

Par. Unit A (RTC)

Unit

B (RTC)

Unit C

(RTC) Adr

EdF

CbP

IdF

MdF

dtE

Ld1

Ld2

Ld3

Display

Causes

Notes

KEYBOARD

enter

ALARM FROM PROBE INPUT

P1

TEMPERATURE ALARM

Temperature alarm from parameter

Temperature alarm from parameter

Alarm from parameter

dLU

on

Alarm from parameter

dLU

on

Alarm from parameter

FLU

on

Alarm from parameter

FLL

on

DIGITAL INPUT ALARM

Door open alarm from input

i1F

,

Cooling relay and fan follow the

Pressure switch lock

i1F, i2F

o

i3F

ELECTRONIC VALVE ALARM

High superheating from

HSH

CL

OCK ALARM

OTHERS

23 EE

The Adr parameter cannot be duplicated because in this case the defrost

cannot be correctly managed.

BEGIN

Find Adr

Modify

Adr

EXIT

The LSn and LAn parameter are only to show the actual settings (read only). Se the
following example of configuration:

DAILY DEFROST FROM RTC: [CbP = Y] and [EdF = rtC]

idF Parameter: for safety reason force the value of idF at +1 respect to the i nterval

between two Ld parameters. The idF timer is reinitialized after defrost and at every
power-on.

DEFROST START: at the time selected by the parameters Ld1 to Ld6 or Sd1 to
Sd6.
DEFROST END: if the probes reach the dtE temperature or for maximum MdF time.
SAFETY and rtC or rtF ALARM: with clock alarm the device will use the parameter
idF, dtE and MdF.

WARNING: don’t set [EdF=rtC] and [CPb=n].

MULTIMASTER DEFROST: all the probes with clock

Table for example

or

n N + 1 N + 2

rtC (clock) rtC (clock) rtC (clock)

Y Y Y

9 hours safety 9 hours safety 9 hours safety

45 min safety 45 min safety 45 min safety

12°C safety 12°C safety 12°C safety

06:00 1° 06:00 1° 06:00 1°
14:00 2° 14:00 2° 14:00 2°

22:00 3° 22:00 3° 22:00 3°

Press for 3 sec, the rtC or other will be showed.
The measurement unit blinks.

Press more than once the DOWN arrow to find the
Adr parameter, the press SET.

Set the value of Adr parameter, then press SET to
confirm the parameter.

Press the two keys together to exit from menu or
wait for about 10 sec.

10. DISPLAY MESSAGES

1 nod

2 Pon

3 PoF

4 rSt

noP, nP

5

nA

P2

P3

P4

6

P5

P6

PPF

CPF

7 HA

8 LA

9 H Ad

10 LAd

11 HAF

No display: the keyboard is trying
to work with another board that is
not working or not present

Keyboard is unlocked

Keyboard is locked

Alarm reset Alarm output deactivated

Not present (configuration)
Not available (evaluation)

Sensor brake down, value out of
range or sensor incorrectly
configured P1C, P2C to P6C.

PPF can be showed by slaves of
pressure that don’t receive the
value of pressure.

CPF is showed when the remote
probe 4 is not working.

ALU on probe rAL.

ALL on probe rAL.

probe defrost probe [dPa / dPb].

probe defrost probe [dPa / dPb].

probe defrost probe [FPa / FPb].

Press for 3 sec UP arrow,
the SEC menu and select LOC
entry.

P1: the cooling output works
with Con and COF,
With defrost probe on error the
defrost is performed only at
interval.

For P5, P6 and PPF: the
percentage of the valve
opening is fixed at PEO value.

12 LAF

13 dA

14 EA

15 CA

16 PAL

17 LOP

18 MOP

19 LSH

20 HSH

21 rtC

22 rtF

24 Err

25 End

probe defrost probe [FPa / FPb].

i2F or i3F = after delay d1d, d2d

or d3d.
Generic alarm from digital input

i1F,i2F,i3F=EAL.
Severe alarm of regulation lock

from digital input i1F,i2F,i3F=bAL.

= PAL.

Minimum operating pressure
threshold from LOP parameter.

Maximum operating pressure
threshold from MOP parameter.

Low superheating from LSH
parameter and SHd delay.

parameter and SHd delay.

Clock settings lost.

Clock damaged.

EEPROM serious problem. Output OFF.
Error with upload/download
parameters.
Parameters have been correctly
transferred.

odc parameter. Cooling restart
as specified on rrd parameter.

Regulation output OFF.

All the outputs are OFF.

The valve output increases its
opening of dML quantity every
second.
The valve output decreases its
opening of dML quantity every
second.
The valve will be closed; the
alarm will be showed after SHd
delay.

Only display.

Defrost will be performed with
IdF till restoring the settings of
RTC.
Defrost will be performed with
IdF.

Repeat the operation.

10.1 ALLARM RECOVERY

Probe alarms P1, P2, P3 and P4 start some seconds after the fault in the related
probe; they automatically stop some seconds after the probe restarts normal
operation. Check connections before replacing the probe.
Temperature alarms HA, LA, HA2 and L A2 automatically stop as soon as the
temperature returns to normal values.
Alarms EA and CA (with i1F = bAL) recover as soon as the digital input is disabled.
Alarm CA (with i1F = PAL) recovers only by switching off and on the instrument.

11. 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. Using
HOT-KEY the Adr will not changed.

11.1 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.

11.2 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 = right programming;
Err = failed programming. In this case push SET key if you want to restart the

programming again or remove the not programmed HOT-KEY.

12. CONTROLLING LOADS

12.1 THE COOLING OUTPUT

The regulation is performed according to the t emperature measured by the
thermostat probe that can be physical probe or virtual probe obtained by a weighted
average between two probes following the formula:

If the temperature increases and reaches set point plus differential the solenoid valve
is opened and then it is closed when the temperature reaches the set point value
again.In case of fault in the thermostat probe the opening and closing time of
solenoid valve is configured by Con and CoF parameters.

12.2 STANDARD REGULATION AND CONTINUOUS REGULATION

The regulation can be performed in three ways: the goal of the first way (standard
regulation) is reaching the best superheat via a classic temperature regulation

obtained using hysteresis. The second way permits to use the valve to realize an high
performance temperature regulation with a good f actor of superheat precision. This

value_for_room_regulation = (rPA*rPE + rPb*(100-rPE))/100

1592023040 XM668D GB r1.1 2011.07.05.doc XM668D 5/14