Connections To Plug-In Terminals - Siemens siprotec 7SA6 User Manual

2.1.3

Connections to Plug-In Terminals

Terminal Blocks for
Voltage
Connections
7SA6 Manual
C53000-G1176-C133-1
Plug-in terminals are only available for voltage connections. Current connections are
made with screw terminals on all 7SA6.
There are two versions of plug-in terminal blocks. They are shown in Figure 2-14.
c b a
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
a
18 terminal
Figure 2-14 Terminal blocks of plug-in terminals for voltage connections — rear view
The system of numbers and letters used to designate the plug-in terminals is illustrat-
ed in Figure 2-15.
Plug-in terminal 2
Figure 2-15 Correlation between plug-in terminals and connection numbers/letters
Each plug-in terminal forms a complete set of connections that consists of three pins
arranged as follows:
Pin a: Signal connection
Pin b: Common connection
Pin c: Shielding connection
The signal pins are the only terminal pins that are directly connected to the internal
printed circuit boards of the 7SA6. Depending on the version of the terminal block, 18
or 12 signal connections are provided. Refer to Figure 2-16.
There are two isolated groups of common pins. Within a group the pins are inter-con-
nected as shown in Figure 2-16. The common pins "b" are not connected to the boards
c
b c
c b a
1
2
12
a
Hardware and Connections
b a
1
2
3
4
5
6
7
8
9
10
11
12
a b c
12 terminal
Plug-in terminal 1
b c
2-15