Connecting Remote Communication Interfaces Ldcm - ABB Relion 650 Series Installation Manual

1MRK 514 027-UEN D
Optical fibers have Transmission (Tx) and Reception (Rx) connectors, and they should be
attached to the Tx and Rx connectors on the SLM module (Tx cable to Rx connector, Rx cable to
Tx connector). Connectors are usually color coded: connect blue or dark grey cable connectors
to blue or dark grey (receive) back-side connectors. Connect black or grey cable connectors to
black or grey (transmit) back-side connectors.
6.2.2

Connecting remote communication interfaces LDCM

The Line Data Communication Module (LDCM) (see Figure 14) is used for transferring binary
and analog signal data between IEDs in different protection schemes on the IEEE/ANSI C37.94
protocol.
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 (1-2 meters). With such an
installation it is important to set the LDCM parameter
650 series
Installation manual
Fiber-optical cables are very sensitive to handling. Do not bend too sharply. The
minimum curvature radius is 15 cm for plastic fiber cables and 25 cm 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 fibers. Do not twist, pull or bend the fiber. Invisible damage may
increase fiber 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.
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Section 6
Connecting
M12637-2 v6
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