Siemens SIWAREX WT241 Manual page 29

Rules
Observe the following rules when connecting analog (strain gauge) load cells:
1. The load cells fitted in the belt scale are connected to the PCB board implemented in the
terminal. Use the load cell connection blocks LC_A or LC_B or LC_C or LC_D to connect
the load cells. The signals will be paralleled due to the layout of the PCB. Use a well-
shielded cable for the connection between belt scale and SIWAREX WT241.
2. The cable shield is always applied at the cable gland of the junction box (SIWAREX JB).
If there is a risk of equipotential bonding through the cable shield, connect an
equipotential bonding conductor parallel to the load cell cable.
3. Twisted wire pairs that are also shielded are required for the specified cables:
– Sensor cable (+) and (-)
– Measuring voltage cable (+) and (-)
– Supply voltage cable (+) and (-)
Figure 6-5
We recommended that you use the cables listed in chapter → Accessories (Page 181).
Table 6- 1
Labeling
Sig-
Sig+
Sen-
Sen+
Exc-
Exc+
SIWAREX WT241
Manual, 05/2015, A5E36046748A
Shielding in the screw gland
Load cell connections on the module
Function
Measurement cable load cell -
Measurement cable load cell +
Sensor cable load cell -
Sensor cable load cell +
Supply load cell -
Supply load cell +
Connecting
6.3 Connecting the load cells
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