ABB Relion 670 series, Technical Manual

Page: 1334 / 1432

I/O
100k W
100nF
Soft ground
en07000242.vsd
IEC07000242 V1 EN-US
Figure 667: Schematic view of soft ground
Grounding
At special problems with ground loops, the soft ground connection for the IIO-ground can be
tested.
Three different kinds of grounding principles can be set (used for fault tracing):
1. Direct ground - The normal grounding is direct ground, connect terminal 2 directly to the
chassis.
2. No ground - Leave the connector without any connection.
3. Soft ground - Connect soft ground pin (3), see figure 666
X.21 connector
Table 1041:Pinout for the X.21 communication connector
Pin number Signal
1 Shield (ground)
2 TXD A
3 Control A
4 RXD A
6 Signal timing A
8 Ground
9 TXD B
10 Control B
11 RXD B
13 Signal timing B
5,7,12,14,15 Not used
22.2.16.3 Functionality
GUID-4512904E-08D1-47EC-B005-E66170CEB130 v1
The data format is HDLC. The speed for the transmission of the messages used is 64 kbit/s.
Section 22 1MRK 502 066-UUS B
IED hardware
1328
Technical manual