Emerson Dixell XM668D Installing And Operating Instructions

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 operating
limits avoiding sudden temperature changes with high atmospheric humidity to
prevent formation of condensation
 Warning: disconnect all electrical connections before any kind of maintenance.
Fit the probe where it is not accessible by the End User. The instrument must not

be opened.
 In case of failure or faulty operation send the instrument back to the distributor or
to "Dixell S.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 supply are separated and
far enough from each other, without crossing or intertwining.
In case of applications in industrial environments, the use of mains filters (our

mod. FT1) in parallel with inductive loads could be useful.
2. GENERAL DESCRIPTION
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 measurement. 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 permits 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.
Figure 1a
1592023040 XM668D GB r1.1 2011.07.05.doc
The CX660 keyboard shall
be mounted on vertical panel,
in a 29x71 mm hole, and
fixed using
bracket supplied as shown in
fig. 1a/1b. The temperature
range allowed for correct
operation is 0 to 60°C. Avoid
places subject
vibrations, corrosive gases,
excessive dirt or humidity.
The same recommendations
Figure 1b
apply to probes. Let air
circulate by the cooling holes.
Figure 1c
4. WIRING DIAGRAM AND CONNECTIONS
4.1 IMPORTANT NOTE
XM device is provided with disconnectable terminal block to connect cables with a
cross section up to 1.6 mm
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 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. 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. To 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. The max distance between an XM controller and a valve must not
exceed 10 m. To avoid any problems, use only shielded cables with
section greater than or equal to 0.325 mm² (AWG22).
!!!!! 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 Model
0 Manual settings
1 Alco EX4-EX5-EX6
2 Alco EX7
3 Alco EX8 500 step/s
4 Danfoss ETS-25/50
5 Danfoss ETS-100
Danfoss ETS-
6
250/400
7 Sporlan SEI .5 to 11
Sporlan SER 1.5 to
8
20
9 Sporlan SEI 30
10 Sporlan SER(I) G,J,K
11 Sporlan SEI-50
12 Sporlan SEH(I)-100
13 Sporlan SEH(I)-175
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)
Connection
numbering
the special
to strong
XM668D
2
for all the low voltage connection: the RS485, the LAN,
LSt uSt
(steps*10) (steps*10) (mA*10)
Par Par
5 75
10 160
10 260
7 262
10 353
11 381
0 159
0 159
0 319
0 250
0 638
0 638
0 638
SPORLAN
ALCO
SEI-SEH-
EX4/5/6/7/8
SER
45 BLUE WHITE
46 BROWN BLACK
47 BLACK RED
48 WHITE GREEN
CPP CHd Sr
(mA*10) (step/s)
Par Par Par
50 10 500
75 25 500
80 50 500
10 10 300
10 10 300
10
10 300
16 5 200
5
12 200
16 5 200
12 5 200
16 5 200
16 5 200
16 5 200
DANFOSS
ETS
BLACK
WHITE
RED
GREEN
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