ABB Relion 670 Series Installation Manual page 75

1MRK 514 026-UUS F
1 2 3
X1
IED
ANSI07000142 V1 EN-US
Figure 48: Communication cable installation, 4-wire
Where:
1
2
3
4
Cc
670 series
Installation manual
Cc
4 5 6
PG
The inner shields shall be connected together (with an isolated terminal block) and only have one
connection point in the whole system, preferably at the external equipment (PC).
The outer shield shall be connected to the IED chassis in every cable end. Use the shield connection clamp
at all IEDs. The first IED will have only one cable end but all others require two.
Connect according to installation instructions for the actual equipment, observe the 120 ohms
termination.
Connect the screens according to the installation instructions for the actual equipment.
Shield connection clamp, see Figure 32.
Communication cable
Cc
1)
1)
1 2 3 4 5 6
X1
IED
PG PG
2)
External
Equipment (PC)
PG 1) 3)
en07000142_ansi.vsd
Section 6
Connecting
69