Connecting Remote Communication Interfaces Ldcm - ABB Relion 670 Series Installation Manual

Section 6
Connecting
6.3.2

Connecting remote communication interfaces LDCM

The Line Data Communication Module (LDCM) (see Figure 19) is used for transferring binary and
analog signal data between IEDs in different protection schemes on the IEEE/ANSI C37.94
protocol. The optical ports on the rear side of the IED are X305, X306, X312, X313, X322 and X323.
When LDCM is used for binary signal exchange between IEDs in the same station or even within
the same panel, the fiber optic cables can be quite short (39-79 inches). With such an installation it
is important to set the LDCM parameter
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Fiber-optical cables are very sensitive to handling. Do not bend too sharply. The
minimum curvature radius is 5.9" for plastic fiber cables and 9.84" for glass fiber
cables. If cable straps are used to fix the cables, apply them with a loose fit.
Always hold the connector, never the cable, when connecting or disconnecting
optical fibres. Do not twist, pull or bend the fibre. Invisible damage may increase
fibre attenuation making communication impossible.
RJ45 LAN ports of the IED are PELV or SELV circuits.
The connected remote circuit must be PELV or SELV circuits.
Ensure that the clearance distance accordance with national regulations, for the
highest voltage that may be present within the cabinet. This can be done by
ensuring that the LAN cables are mounted and fixed with sufficient distance to all
HLV circuits.
During transportation of a relay mounted in a cubicle, the optical fibers must be
disconnected from the OEM ports.
Strictly follow the instructions from the manufacturer for specific types of optical
cables/connectors.
When utilizing galvanic RJ45 SFP ports for the IEDs network connection(s), the
installation shall be done in such way that the electrical power distribution
environment follows Environment A as specified in IEEE 802.3. In other words, the
LAN or LAN segments, with all its associated interconnected equipment, is entirely
contained within a single low-voltage power distribution system and within a
single building.
OptoPower = LowPower .
1MRK 514 026-UUS F
M12637-2 v6
670 series
Installation manual