1592023130 XM670K_XM679K GB r4.2 26.06.2017.docx XM670K - XM679K 1/10
CONTROLLERS FOR MULTIPLEXED CABINETS
XM670K- XM679K
-MANUAL FOR THE SW REL. 4.2-
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.
Dixell Srl reserves the right to change the composition of its products, even without notice, ensuring
the same and unchanged functionality.
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. BEFORE PROCEEDING
2.1 CHECK THE SW REL. OF THE XM679K
1. Look at the SW rel. of XM679K printed on the label of the controller.
2. If the SW release is 4.2 proceed with this manual otherwise contact Dixell to get the right manual.
3. GENERAL DESCRIPTION
The XM670K/XM679K are high level microprocessor based controllers for multiplexed cabinets suitable
for applications on medium or low temperature. It can be inserted in a LAN of 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 XM670K/XM679K are provided with 6 relay outputs to control the
solenoid valve, defrost - which can be either electrical or hot gas - the evaporator fans, the lights, an
auxiliary output and an alarm output and with one output to drive pulsed electronic expansion valves
(only XM679K). The devices are also provided with four probe inputs, one for temperature control, one
to control the defrost end temperature of the evaporator, the third for the display and the fourth can be
used for application with virtual probe or for inlet/outlet air temperature measurement. The model XM679K
is provided by other two probes that have to be used for superheat measurement and regulation. Finally,
the XM670K/XM679K are equipped with the three digital inputs (free contact) fully configurable by
parameters.
The instruments are equipped with the HOTKEY connector that permits to be programmed in a simple
way. Direct serial output RS485 ModBUS-RTU compatible permits a simple XWEB interfacing. RTC are
available as options. The HOTKEY connector can be used to connect X-REP display (Depending on the
model).
4. INSTALLATION AND MOUNTING
This device can operate without any user interface, but normal application is with Dixell CX660 keyboard.
Figure 1a
Figure 1b
The CX660 keyboard shall 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 1c
5. WIRING DIAGRAM AND CONNECTIONS
5.1 IMPORTANT NOTE
XM device is provided with disconnectable terminal block to connect cables with a cross section up to 1.6 mm2 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). Heatresistant 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.
5.2 XM670K – ALL POWER SUPPLY
5.3 XM679K – 230VAC VALVES
5.4 XM679K – 24VAC VALVES
NOTE: the jumper indicated as JMP is inside the case of the controller. This jumper
has to be closed only in case of driving 24Vac valve.
5.5 KEYBOARD DISPLAY CX660
The XM670/679K board can operate also without keyboard.
Polarity:
Terminal [34] [-]
Terminal [35] [+]
Use twisted shielded cable
AWG 18 or less in case of long
distance.
Max distance: 30m
5.6 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 Adr parameter is the number to identify 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 is 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.
The max distance allowed is 30m
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5.7 SENSORS FOR SUPERHEAT CONTROL – ONLY FOR XM679K
Temperature probe: Pb6 terminals [19] - [20] without 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 supply for ratiometric pressure
transducer.
Select the configuration of the transducer with parameter P5C.
5.8 HOW TO USE ONLY ONE PRESSURE TRANSDUCER ON MULTIPLEXED APPLICATIONS
A working LAN connection is requ ired (green LED lit on all XM670-XM679K boards of the same LAN). Connect
and configure a pressure transducer only on one XM670-XM679K 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.
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 SUPERHEAT
On the fast access menu:
dPP is the value read by the pressure 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 nA or Err messages mean that the superheat has no sense in that
moment and its value is not available.
5.9 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 tape.
Only one device for each LAN has to be connected to the RS485 connection.
The Adr parameter is the number to identify 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).
5.10 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 parameter 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.
5.11 ANALOG OUTPUT
Selectable between 4 to 20mA and
0 to 10Vdc.
Use CABCJ15 to perform the connections
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.
6. QUICK REFERENCE GUIDE: HOW TO RUN THE SELF ADAPTIVE
REGULATION IN 4 STEPS.
1. After wiring the XM679K, set the proper gas via Fty parameter. Pre-set gas is R404A.
2. Configure the probes:
- Regulation and evaporator probe are preset as NTC. If another kind of sensors is used, set it via
P1c and P2c parameters.
- Superheat evaporator outlet probe is pre-set as Pt1000, if another kind of sensor is used, set it
via P6c parameter.
- The PP11 (-0.5÷11bar) is pre-set as pressure probe. It operates at relative pressure (Pru = rE).
If you’re using a ratiometric transducer, set P5c = 0-5, then use parameters PA4 and P20 to set
the range
NOTE: check the pressure gauge reading with the value of dPP, press the UP arrow once to enter
the Fast Access Menu. If ok, proceed; otherwise solve the situation before proceeding acting on
par. Pru, PA4 and P20.
3. Set the parameters for self adaptive regulation of superheat
NOTE: the parameters Pb (regulation band) and Int (integral time) are automatically calculated by the
controller
- Set CrE = no, this disable the continuos regulation of the temperature. Default is CrE = no.
- Set SSH, superheating setpoint: a value between 4 and 8 is acceptable. Default is SSH=8
- Set AMS = y to start the self adaptive regulation. Default is AMS = y
- Set ATU = y to start the search of the lowest stable superheat. Default is ATU = y. This function
reduces automatically the setpoint in order to optimize the use of the evaporator, keeping, at the
same time, the superheating regulation stable. The minimum allowed SH set point is LSH+2°C.
- Set LSH, low superheating limit: a value between 2-4 is acceptable. Default is LSH = 3
- Set SUb, pressure filter: Default is SUb = 10. The value can be increased up to 20 in case of too
fast response of the pressure variations.
4. Set the parameters for the temperature regulation
- Set the temperature setpoint. Default is -5°C
- Set the differential HY: Default is 2°C.
- If the capacity of the valve is higher than requested, it can be reduced by the par. MNF (Default
is 100). A proper setting of MnF will reduce the time that the algorithm takes to reach the stability.
MNF value doesn’t affect the band witdh
7. USER INTERFACE
7.1 ICONS
Cooling output
↓
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 →
← Fan
Defrost →
AUX
← Auxiliary relay
Energy saving →
← Multimaster Enabled
Generic alarm →
← Clock / time
DURING PROGRAMMING: blink the measurement units of temperature and pressure
7.2 KEYBOARD COMMANDS
Single commands:
LIGHT relay
Press light button.
AUX relay
Press down arrow.
Manual defrost
Press and hold for 3 sec the defrost button
ON/OFF
Press for 3 sec the ON/OFF button (if the function is enabled).
Energy Saving
Press for 3 sec the ON/OFF button (if the function is enabled).
Double commands:
Press and hold for about 3 sec to lock (Pon) or unlock (PoF) the keyboard.
Pressed together to exit from programming 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.
7.3 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
Press SET button for 3 sec, the measurement units will blink together.
1592023130 XM670K_XM679K GB r4.2 26.06.2017.docx XM670K - XM679K 3/10
Value
modification
or
With the arrows it’s possible to change the value within the LS and US
parameters value.
EXIT
By pressing SET it is possible to confirm the value that will blink for
about 2 sec.
In any 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.KEY COMBINATIONS
8. 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
Press and hold for about 3 sec to have access to the first
programming level (Pr1).
Select item
or
Select the parameter or submenu using the arrows.
Show value
Press SET button.
Modify
or
Use the arrows to modify the value.
Confirm and
store
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).
8.1 HOW TO HAVE ACCESS TO “PR2”
To enter Pr2 programming menu:
1. Access to a Pr1 menu by pressing both SET+DOWN keys for 3 sec, the first parameter label will be
showed;
2. Press DOWN key till the Pr2 label will be showed, then press SET;
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.
8.2 HOW TO MOVE PARAMETER FROM PR1 TO PR2 AND VICE VERSA
Enter on Pr2; select the parameter; press together [SET + DOWN]; 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).
9. 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 stands for probe not present or value not
evacuate, Err value out of range, probe damaged not connected or incorrectly configured.
Entering fast
access menu
By press and release the UP arrow. The duration of the menu in
case of inactivity is about 3 min.
The values that will be showed depend on the configuration of the
board.
Use
or
arrows to
select an
entry,
then press
to see the
value or to
go on with
other value.
HM Access to clock menu or reset of the RTC alarm;
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.
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];
dPF Virtual probe for fan management [FPA];
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
10. 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 physically connected to the board, through the LAN functionality.
Action
Button or display
Notes
Enter menu
Press UP arrow for about 3 sec, the icon will be ON.
Waiting for action
SEC
The menu to change the section will be entered. SEC label
will be displayed.
Enter section list
Press SET to confirm. The following list will be available to
select the proper network function.
Select proper
function
Or
LOC
ALL
SE1
SEn
SE8
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 (*)
Confirm
Select and confirm an entry by pressing SET button.
Exit menu
Press SET and UP together or wait about 10 seconds.
(*) The devices on the LAN are indexed by using the Adr parameter (in ascending order).
EXAMPLES:
1. To modify the same parameter values in all the devices connected to the LAN: enter multimaster 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. To 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 fro m
multimaster menu.
AT THE END OF THE PROGRAMMING PROCEDURE, SELECT THE SECTION “LOC”. IN THIS WAY
THE ICON WILL BE SWITCHED OFF!!
10.1 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.
The Adr parameter cannot be duplicated because in this case the defrost cannot be correctly managed.
BEGIN
Press for 3 seconds, the rtC or other will be showed. The
measurement unit blinks.
Find Adr
Press more than once the DOWN arrow to find the Adr parameter,
the press SET.
Modify Adr
or
Set the value of Adr parameter, then press SET to confirm the
parameter.
EXIT
Press the two keys together to exit from menu or wait for about 10
seconds.
The LSn and LAn parameter are only to show the actual settings (read only). Se the following example of
configuration:
DAILY DEFROST FROM RTC: : [cPb = y] & [EdF = rtC]
IdF Parameter: for safety reason force the value of Idf at +1 respect to the interval 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
Par.
Unit A (RTC)
Unit B (RTC)
Unit C (RTC)
Adr n N + 1
N + 2
EdF
rtC (clock)
rtC (clock)
rtC (clock)
IdF
9 hours safety
9 hours safety
9 hours safety
MdF
45 min safety
45 min safety
45 min safety
dtE
12°C safety
12°C safety
12°C safety
Ld1
06:00 1°
06:00 1°
06:00 1°
Ld2
14:00 2°
14:00 2°
14:00 2°
Ld3
22:00 3°
22:00 3°
22:00 3°
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