14
S2/S9
6
Electrical connection
The transducers are supplied with a 3m (S2) or 6 m (S9) length of
unterminated cable.
ATTENTION
The balancing resistors must not be cut off the end of the cable
(sensitivity would alter).
The cable shielding is connected in accordance with the Greenline concept.
Under this scheme, the measurement system is enclosed in a Faraday cage;
then electromagnetic interference does not affect the measurement system.
Transducers with unterminated cables must be fitted with connectors to CE
standard. In this event the shielding must be laid evenly over the whole area.
If a different connection technique is used then good EMC shielding is to be
provided in the wiring loom, the shielding again being laid over the full area
(see also HBM Greenline Information, document G36.35.0).
6.1
Notes on cabling
•
Always use shielded, low-capacitance measurement cable supplied by
HBM.
•
Do not lay measurement cable parallel to high-voltage power lines or
control circuits. If this is not possible (e.g. in cable shafts) protect the
measurement cable, e.g. with armoured steel tube and maintain a minimum
distance of 50 cm from the other cables. High-voltage power lines and
control circuits should be twisted (15 turns per metre).
•
Avoid stray fields from transformers, motors and contactors.
•
Do not earth transducer, amplifier and display device more than once. All
the devices in the measurement chain are to be connected to the same
earthed conductor.
•
Link the connection cable shielding to the transducer housing.
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