Battery Back Up Connection - Emerson XM678D Manual

6.5 ABSOLUTE MAXIMUM POWER
XM678D is able to drive 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 Dixell 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
(4 wires)
UNIPOLAR VALVES
(5-6 wires)
6.6 KEYBOARD DISPLAY CX660
The XM678D board can operate also without
keyboard.
6.7 LAN CONNECTION
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
6.8 SENSORS FOR SUPERHEAT CONTROL
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.
6.9 HOW TO USE ONLY ONE PRESSURE TRANSDUCER ON
MULTIPLEXED APPLICATIONS
A working LAN connection is required (green LED lit on all XM678D boards of the same
LAN). Connect and configure a pressure transducer only on one XM678D 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:
1592023140 XM678D GB r2.8 01.09.2017.docx
Maximum Current 0.5A
Maximum Current 0.33A
Polarity:
Terminal [34] [-]
Terminal [35] [+]
Use twisted shielded
cable AWG 18 or less
in case of long
distance.
Max distance: 30m
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.
6.10 HOW TO CONNECT MONITORING SYSTEM
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).
6.11 DIGITAL INPUTS
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.
6.12 ANALOG OUTPUT
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.

7. BATTERY BACK UP CONNECTION

7.1 CONNECTION OF XEC SUPERCAP
XEC Supercap is designed to be used with Dixell products (XM678D, XEV, IEV and
others); compatibility with Dixell devices has to be verified in the user manual/technical
sheet of the device.
In case of dubt, please contact Dixell Service department.
!!!!! IMPORTANT !!!!!
XEC Supercap and XM678D must be powered by two different transformers; the
failure of the observance of this rule may result in damage to the XEC Supercap and /
or the connected XM678D.
Wiring connection
XM678D
Terminal 61 (+) Terminal 4 (12Vdc)
Terminal 62 (-) Terminal 3 (gnd)
XM678D
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.
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.
Selectable between 4 to 20mA and

0 to 10Vdc.
 Use CABCJ15 to perform the
connections
XEC
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