Emerson XM678D, Operation And Installation Manual

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Keyboard Display CX660 Wiring Diagram and Connections • 11
6.7. Keyboard Display CX660
The XM678D controller can also operate without the
keyboard.
Polarity:
• Terminal [34] [-]
• Terminal [35] [+]
Use twisted shielded cable AWG 18 or less in case of
long distance.
Max Distance: 30m
6.8. LAN Connection
To create a LAN connection and to a perform
synchronized defrost (also called master-slave
functioning):
1. Connect a shielded cable between terminals 38 [-]
and 39 [+] for a maximum of eight (8) sections.
2. The Adr parameter is the number that identifies
each electronic board. Address duplication is not
permitted ; in this case, synchronized defrost and the
communication with the monitoring system are not
guaranteed (the
Adr is also the MODBUS address).
See Figure 6-4 for an example of a properly
configured LAN connection:
6.9. Sensors for Superheat
Control
Temperature probe: Pb6 Terminals 19-20 without
any polarity.
Select the kind of sensor with the
P6C parameter.
Pressure transducer: Pb5 Terminals
[ 21 ] = signal input
[ 22 ] = power supply for 4 to 20mA transducer
[ 20 ] = GND
[ 23 ] = +5VDC power supply for ratiometric
pressure transducer
Select the transducer configuration with the
P5C
parameter.
Figure 6-3 - XM678D Keyboard Display
Figure 6-4 - LAN Connection
NOTE: If the LAN is connected properly, the
green LED will be ON. If the LAN is not
connected properly, a blinking LED will
display. The maximum allowed distance is
30m.
Figure 6-5 - Sensors for Superheat Control