Siemens SIWAREX MS, Device Manual

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Hardware
Configuration and Assembly
Figure 4-2 Shielding connection for load cell cable
4.4.3 Connection of 24 V Power Supply
The power supply 24 V is connected directly to the terminals M and L+ on the
SIWAREX MS expansion module.
4.4.4 Ground Connection to the Interference Dissipation
The ground wire is connected to a suitable point for dissipating interference.
4.4.5 Load Cell Connection
Measuring sensors can be connected to the SIWAREX MS if they are fitted with
strain gauges (full bridge) and meet the following conditions (see the technical data
as well – Chapter
11.4
):
- Characteristic value 1.... 4 mV/V
- Supply voltage of 6 V is permissible
The following rules are to be followed when connecting load cells (WZ).
1. Use of a junction box (SIWAREX JB) is necessary if more than one load cell is
connected (the load cells must be connected in parallel). If the distance from a load
cell to SIWAREX MS or to the junction box is greater than the available length of
the load cell connecting cable, the SIWAREX EB extension box should be used.
2. The cable shielding is always run to the cable gland on the junction box
(SIWAREX JB) or the extension box.
If there is a danger of potential equalization currents on the cable shielding, a
potential equalization conductor should be run in parallel to the load cell cable.
SIWAREX MS 4-13