ExV is supplied by the Node at end of the Bus Segment
The specifications of the components are:
a) Ru + 5 V to Signal B = 390 W, 0.25 W ±2.5%
b) Rt Signal B to Signal A = 220 W, 0.25 W ±2.5%
c) Rd Signal A to GND = 390 W, 0.25 W ±2.5%
2.3.3 Bus power distribution
The end node in each Ph-segment applies 5 V bus excitation power to the Termination network via
the Excitation pair (ExV+ and GND) used in the Type 3 Physical layer specification.
5.7.3 Data on RS485 serial communication module cable
Type: Twisted-pair S-STP (Screened – Screened Twisted Pair)
Shield: Individual foil for each pair with overall copper braid
Length: Maximum 1200 m (3000 ft) from one system earth to the next system earth
(includes length from platform point to system earth on both sides)
Temp: According to application
Impedance: 120 W
Capacitance: Less than or equal to 42 pF/m
Example: Belden 9841,Alpha wire 6412, 6413
5.8 Installing the GPS antenna
5.8.1 Antenna installation
The antenna is mounted on a console for mounting on a horizontal or vertical flat
surface or on an antenna mast.
1MRK 502 029-UEN A Section 5
Installing the IED
83
Installation and commissioning manual
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