User Manual

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Siemens Building Technologies SED2 LON Module Operating Instructions CE1B5193en
HVAC Products 3 Installation and wiring 26.06.2006
3.4 Installation and wiring notes
WARNING:
A VSD can be switched on unintentionally if the serial bus installation is not operated
correctly. The bus must be started by personnel who are qualified and trained in in-
stalling systems of this type.
1. DIP switches
Leave the DIP switches on the front of the LON module in OFF position (factory
setting) to ensure proper operation of the LON module.
2. Wiring
Wiring must conform to local codes and ordinances.
3. Wire routing
• Maintain a minimum of 1.5 m between VSDs and network or sensor wiring
• If it is necessary for network and sensor wiring to cross VSD wiring, it should
cross at 90-degree angles
4. POWER
The LON module receives power through its SED2 connection. If VSD power is
switched off, the LON module will not communicate on the network.
5. L
ONTalk NETWORK
The L
ONTalk network connection is on the bottom edge of the LON module (see il-
lustration 5193J02 on page 10). Figure 5193A01 below shows the wiring schematic
for this connection. See http://www.echelon.com/
for more details on the network
cable and the FTT-10A connector.
29 (P+)
30 (N-)
L
ON
T
ALK
TP/FT-10
L
ON
T
ALK
TP
/
FT-10
5193A01
Field wiring
SED2
-
L
ON
I/F
terminals
NOTE: This connection supports twisted pair, polarity-insensitive, peer-to-peer
communications at 78 Kbps.