Parallel Connection Of More Than One Transducer; Connections Using The Four Wire Technique; Cable Extension; Notes On Cable Routing - HBM U2A Notice De Montage

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4.3 Parallel connection of more than one transducer

The transducers are connected in parallel electrically by joining together the
core ends of the transducer connection cables having the same color.
ATTENTION
An overload of individual load cells cannot be detected from the output
signal.

4.4 Connections using the four wire technique

With connections to amplifiers using the four wire technique the cores bu
(blue) and gn (green) should be connected together, as should bk (black) and
gr (grey). Please take in account that this causes deviations to the sensitivity
and the temperature coefficient of sensitivity that this causes.

4.5 Cable extension

Extension cables must be screened and of the low capacitance type. We re
commend the use of HBM cables which fulfil these requirements. For cable
extensions, care must be taken to ensure a satisfactory connection with the
lowest possible transfer resistance and goog insulation.
When using the six wire technique, the effects of resistance changes in the
extension cable are compensated. If you extend the cable with the four wire
technique, the sensitivity deviation can be rectified by adjustment. Tempera
ture effects though are only compensated with the operation using six wire
technique.

4.6 Notes on cable routing

The load cell connecting cable should be routed so that any condensed water
or dampness forming on the cable can drip off. It must not be led to the load
cell. In addition, it must be ensured that no dampness can penetrate the open
end of the cable.
HBM
U2A
A1261−2.1 en/de/fr