Cable Extension And Cable Shortening; Emc Protection - Hbm U9C Montageanleitung

Electrical connection
7.1.2

Cable extension and cable shortening

Various connection cable lengths are available for the U9C so that cable
extensions and cable shortening are generally not necessary.
As the transducer has a four-wire configuration, the cable is also used to
compensate the temperature dependence of the sensitivity. We therefore do
not recommend shortening the cable and extension cables should be
implemented in a 6-wire configuration. Please note the operating instructions
for your amplifier system in this case. All C9Cs ordered with fitted plugs have a
6-wire configuration from the plug. See the Specifications section 9 on page 32
of this manual for the connector pin assignment. Please remember that an
extension cable must have six wires. Such an extension will have no influence
on the measurement. If you have selected the "Sub HD" option (for QuantumX)
as the connector in combination with the "TEDS" option, you must extend with
eight wires as in this case a so-called "one-Wire TEDS" is mounted, and this
requires an additional wire.
With extension cables, ensure that the connection is perfect with a low contact
resistance and continue to connect the cable shield extensively. Note that the
protection class of your force transducer will decrease if the cable connection
is not tight and water can penetrate the cable. Transducers can be irreparably
damaged and fail in these circumstances.
7.1.3

EMC protection

Electrical and magnetic fields can often induce interference voltages in the
measuring circuit. Please comply with the following points:
S Use shielded, low-capacitance measurement cables only (HBM cables fulfill
both conditions).
S Do not route the measurement cable parallel to power lines and control
circuits. If this is not possible, protect the measurement cable with metal
tubing
S Avoid stray fields from transformers, motors and contact switches.
S Note that compensating currents flowing through the cable shield can cause
major interference. If the sensor and your evaluation unit are at different
electrical potentials, an electrical connection with very low resistance must
be provided.
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A03815_03_YI0_01 HBM: public
U9C