Shield Connection; Table 6- 2 Load Cell Connections On The Module; Image 6-2 Shielding In The Screw Gland - Siemens SIWAREX WP251 Manual

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 (-)
Image 6-2
We recommended that you use the cables listed in chapter → Accessory (Page 213).
4. The shield must be connected to ground directly in the vicinity of the SIWAREX WP251.
The maximum distance between the SIWAREX WP251 and the load cell applies when
using the recommended cables.
Table 6- 2
Labeling
Sig-
Sig+
Sen-
Sen+
Exc-
Exc+
6.4

Shield connection

Make sure you observe the correct design of the shield support for the shielded cables. It is
the only way to ensure immunity of the system.
A cable is shielded to attenuate the effects of magnetic, electrical and electromagnetic
interference on the cable. Interference currents on cable shielding are diverted to ground by
conductive isolation rails. To avoid interference as a result of these currents, it is imperative
to provide a low-impedance connection to the ground.
Use only cables with protective braided shield (see recommended cables of digital load cells
in chapter Accessory (Page 213)). Shielding density must be at least 80%.
SIWAREX WP251
Manual, 12/2015, A5E37203357A
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 +
Connection
6.4 Shield connection
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