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Figure 6-1
Residual temperature error for a load cell per 10 K temperature change when shortening or
lengthening the connecting cable
If three or four load cells are operated in parallel and the cable for a cell is lengthened, the
additional error is approximately one third or one quarter. This assumes that the load is
distributed evenly across the load cells.
Connecting cable in six-wire system
For connecting cables in the six-wire system, the supply voltage is fed back to the weighing
module as the reference voltage. Shortening or lengthening has no effect on the measuring
result.
Additional connecting cables
The maximum permissible cable length between the load cell and the weighing module is stated
in the technical specifications for the weighing module. In Ex applications, you must also take
into account the specifications of the Ex i interface.
For connecting the junction box to the weighing module, to extend a load cell connecting cable
or for cross-connection of two junction boxes, a shielded, six-core cable must be used, e.g.
Li2Y2x0.75St+2x(2x0.34St)-CY Siemens Order No.: 7MH4 702‑8AG or, for intrinsically safe Ex
applications, 7MH4 702‑8AF.
Commissioning
6.2 Application planning
SIWAREX WL200
36
Operating Instructions, 12/2021, A5E02199611B-13
