LN-Display Installation Instructions
5
The minimum cable section for power wiring is
18 AWG. We recommended using the heaviest gauge
wire based on a maximum of 14 AWG and a minimum
of 18 AWG.
If you are applying power to more than one device, use
the following method to calculate power requirements
of the transformer:
•
Add maximum power consumption of all devices
and multiply by 1.3.
•
If the resulting number is higher than 100 VA, use
multiple Class 2 transformers. Do not interconnect
the outputs of Class 2 transformers or power
sources unless listed for such connections.
•
For multiple devices powered from the same
transformer, maintain consistent polarity between
all controllers. Connect the COM terminals from
each controller to the same terminal on the
secondary side of the transformer.
We recommend using an external fuse on the 24 VAC
secondary side of the transformers to protect all
devices against power line spikes (Figure 10).
Communications Wiring
The approved cable type for LON communications is
Level IV 22 AWG (0.65 mm) UNSHIELDED. You can
use both one-pair and two-pair wires. The LON
communication wire is polarity insensitive and can be
laid out in either bus, star, loop, or free topology.
Connect both wires to the NET terminals of the
controller. If you are inserting multiple wires in the
terminals, properly twist wires together prior to inserting
them in the terminal connectors (Figure 11).
Note:
For additional information about network
topology and wire-length restrictions, refer to the
Echelon®
Junction Box and Wiring Guideline for
Twisted Pair L
ON
W
ORKS
Networks
(Part No. 005-0023-01)
.
!
CAUTION: Risk of Electric Shock.
Disconnect the power supply before
making electrical connections to avoid
electric shock.
MISE EN GARDE : Risque de décharge
électrique.
Débrancher l'alimentation avant de
réaliser tout raccordement électrique afin
d'éviter tout risque de décharge
électrique.
Figure 10: Power Wiring
+
FUSE
Controller
2
COM
AC
Transformer
LN-Display
-
24 VAC/DC
24 VAC/DC
24 VAC/DC
24 VAC
IMPORTANT:
Use proper terminations on the
network, according to the type of network topology
you are using. Failure to do so might result in
communication errors between controllers. Do not
use multiple gauges of cable on the same
communication bus, as this may also result in
communication errors.
Figure 11: Communications Wiring
C o n tr o lle r 2
E C -D i s p la y
Network
N E T
G N D
N E T B
N E T A
LN-Display