Functionality - ABB Relion 670 Series Application Manual

Section 5
Communication set-up
100k
IEC07000242 V2 EN-US
Figure 66: Schematic view of soft earth
Earthing
Three different kinds of earthing principles can be set (used for fault tracing):
1. Direct earth - The normal earthing is direct earth, connect terminal 2 directly to the
chassis.
2. No earth - Leave the connector without any connection.
3. Soft earth - Connect soft earth pin (3), see figure
X.21 connector
Table 24: Pinout for the X.21 communication connector
Pin number
1
2
3
4
6
8
9
10
11
13
5,7,12,14,15
5.4.3

Functionality

The data format is HDLC. The speed for the transmission of the messages used is 64 kbit/s.
68
I/O

100nF
Soft ground
IEC07000242-2-en.vsdx
Signal
Shield (earth)
TXD A
Control A
RXD A
Signal timing A
Earth
TXD B
Control B
RXD B
Signal timing B
Not used
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65
GUID-4512904E-08D1-47EC-B005-E66170CEB130 v2
Communication set-up, 670/650 series
1MRK 505 382-UEN E
Application Guide