I/O
100k
100nF
Soft ground
IEC07000242-2-en.vsdx
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
Signal
1
Shield (earth)
2
TXD A
3
Control A
4
RXD A
6
Signal timing A
8
Earth
9
TXD B
10
Control B
11
RXD B
13
Signal timing B
5,7,12,14,15
Not used
5.4.3
Functionality
GUID-4512904E-08D1-47EC-B005-E66170CEB130 v2
The data format is HDLC. The speed for the transmission of the messages used is 64 kbit/s.
Section 5
1MRK 505 382-UEN E
Communication set-up
68
Communication set-up, 670/650 series
Application Guide
© Copyright 2017 ABB. All rights reserved
Summary of Contents for Relion 670 series
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