Wiring Considerations And Guidelines For Network Integrations - Johnson Controls NAE55 Series Installation Instructions Manual

L W Network
ON ORKS
Terminal Block
L W Network
ON ORKS
Terminal Block Plug
Wires from
L W
ON ORKS
Trunk
L W Network wires are not polarity sensitive.
ON ORKS
Figure 7: L W
ON ORKS
and Wiring Connections
4. Make connections to the RS-232 serial ports (if
necessary).
5. Connect the 24 VAC supply power wires from the
transformer to the removable power terminal block
plug, as shown in Figure 8.

Wiring Considerations and Guidelines for Network Integrations

Table 1: Guidelines for N2 Network Topology
Category
General
Number of Devices
Line Length and Type
Cable
Terminations
6 NAE55/NIE55 Installation Instructions
Network
Network Terminal Block
Rules/Maximums Allowed
MS-NAE55xx-x models (only) support up to two N2 Bus trunks.
Only daisy-chained N2 devices (with maximum stub length of 3 m [10 ft] to any device)
MS-NAE551x-x models (only) support up to 100 N2 devices per N2 Bus, with no more than two
repeaters between NAE55 and any N2 device and a maximum of 50 devices between repeaters.
1,500 m (5,000 ft) twisted pair cable without a repeater
4,500 m (15,000 ft) twisted pair cable from NAE55 and the farthest N2 device (three segments of
1,500 m [5,000 ft] each, separated by repeaters)
2,000 m (6,600 ft) between two fiber modems
Solid or stranded 1.5 mm
Solid or stranded 0.6 mm (24 AWG) larger 3-wire or 4-wire (two twisted-pairs) is acceptable.
Note: The + and - bus leads should be a twisted pair. On applications using 4-wire
(two twisted-pairs) cable, isolate and insulate unused conductor.
Preferred Termination Configuration: Two N2 devices with EOL switches in the ON position,
one at each end of each N2 Bus segment
Minimally Required Termination Configuration: At least one N2 device with an EOL switch in
the ON position somewhere on each N2 Bus segment
NAE
Power Terminal
Block
Wires from
Johnson Controls
24 VAC Class 2
Power Transformer
Figure 8: 24 VAC Supply Power Wiring
Note: Power supply wire colors may be different on
transformers not manufactured by Johnson Controls.
Follow the transformer manufacturer's instructions and
the project installation drawings.
Note: The 24 VAC power should be connected to all
network devices so transformer phasing is uniform
across the devices. Powering network devices with
uniform 24 VAC supply power phasing reduces noise,
interference, and ground loop problems. The NAE55
does not require an earth ground connection.
2
(18 AWG) 3-wire is recommended.
24V~
NAE
Power Terminal
Block Plug
Orange Wire
Brown Wire
(COM) (24 VAC)