Siemens SIWAREX WP241 Manual page 27

Rules
Observe the following rules when connecting analog (strain gauge) load cells:
The load cells fitted in the belt scale are connected in parallel in a junction box (e.g.
SIWAREX JB). Use a well-shielded cable for the connection between junction box and
SIWAREX WP241 (see SIWAREX cables → Accessories (Page 177)).
1. The cable shield is always applied at the cable gland of the junction box (SIWAREX JB).
2. Twisted wire pairs that are also shielded are required for the specified cables:
Figure 6-2
3. The shield must be connected to ground directly in the vicinity of the SIWAREX WP241.
Table 6- 2
Labeling
Sig-
Sig+
Sen-
Sen+
Exc-
Exc+
SIWAREX WP241
Manual, 04/2014, A5E33713528A
If there is a risk of equipotential bonding through the cable shield, connect an
equipotential bonding conductor parallel to the load cell cable.
– Sensor cable (+) and (-)
– Measuring voltage cable (+) and (-)
– Supply voltage cable (+) and (-)
Shielding in the screw gland
We recommended that you use the cables listed in chapter → Accessories (Page 177).
The maximum distance between the SIWAREX WP241 and the load cell applies when
using the recommended cables (see SIWAREX cables → Accessories (Page 177)).
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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