Commissioning
6.2 Application planning
SIWAREX WL200
32 Operating Instructions, 07/2016, A5E02199611B-03
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.
Further information: see section: Accessories (Page 98)
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