8.1 Wiring for SIRAX V 644
Plug-in module
SIRAX V 644
Back-
plane
M
= Measured variable/measuring
input, terminal allocation acc.
to the measuring mode and
application, see "Table 2:
Measuring input"
A1
= Output signal / measuring output
A2
= 2nd output (field indicator)
K
= Output contact for open-circuit
sensor supervision or for
monitoring a limit GW
H
= Power supply
Ni 100 = Compensating resistor Ni 100 for
plugging onto backplane BP 902
8.1.1 Compensating resistor Ni 100 for universal transmitter SIRAX V 644
This only applies to SIRAX V 644 units that are to be used for measuring temperature with a thermocouple and internal refe-
rence point.
The compensating resistor Ni 100 detects the temperature at the transition point. The thermocouple or compensation leads
must be connected to the terminals of the backplane.
Hold the Ni 100 (10) with tweezers of appropriate size and insert the connection wires into the socket (7) (Fig. 6).
(10)
Fig. 6. Plug the compensating resistor Ni 100 (10) into the connector (7) on the backplane.
38
a1 a3 a5 c2 c4 c6
a7 c8
A B C D E F
Ni 100
M
(7)
a26 a28
a30 a32
G H
I
K
–
+
–
+
A1
A2
Energized:
De-energized: L – M
Connection
1
2
1A
2A
1B
2B
1C
2C
M
1D
2D
1E
2E
1F
2F
–
1G
2G
A1
+
1H
2H
–
1I
2I
A2
+
1K
2K
1L
2L
K
1M
2M
1N
2N
(7)
Relay
c27 c29 c31
a20
L M N
O
(–)
~
K
H
N – M
Slot
3
4
5
6
7
3A
4A
5A
6A
7A
3B
4B
5B
6B
7B
3C
4C
5C
6C
7C
3D
4D
5D
6D
7D
3E
4E
5E
6E
7E
3F
4F
5F
6F
7F
3G
4G
5G
6G
7G
3H
4H
5H
6H
7H
3I
4I
5I
6I
7I
3K
4K
5K
6K
7K
3L
4L
5L
6L
7L
3M
4M
5M
6M
7M
3N
4N
5N
6N
7N
c14
P
(+)
~
8
8A
8B
8C
8D
8E
8F
8G
8H
8I
8K
8L
8M
8N