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Important
The transducer degree of protection can drop if the cable connection does not have the
same protection level as the transducer.
8.1.3
4-wire connection
When transducers in a six-wire configuration are connected to amplifiers in a four-wire
configuration, the sense leads of the transducers must be connected to the correspond
ing excitation voltage leads: Marking (+) with (+) and marking (-) with (-), see Fig. 8.1. This
measure reduces the cable resistance of the excitation voltage leads, among other
effects. If you use an amplifier with a 4-wire circuit, the output signal and the temperature
dependence of the output signal (TCS) depend on the length of the cable and the temper
ature. If you use the 4-wire circuit as described above, this will result in slightly higher
measurement errors. An amplifier system working with a 6-wire circuit ensures perfect
compensation for these effects.
8.1.4
EMC protection
Electrical and magnetic fields often induce interference voltages in the measuring circuit.
Therefore:
S
Use only shielded, low-capacitance measurement cables (HBM cables fulfill both con
ditions).
S
Do not route measurement cables parallel to power lines or control circuits. If this is
unavoidable, protect the measurement cable, e.g., using rigid steel conduits.
S
Avoid stray fields from transformers, motors and contact switches.
S
Connect all the devices in the measurement chain to the same protective conductor.
S
Always connect the cable shield extensively on the amplifier side, to create the best
possible Faraday cage.
S
Do not ground transducers, amplifiers and indicators more than once.
8.2
Electrical connection with integrated IO-Link amplifier module
8.2.1
General information
If you have ordered the sensor with integrated amplifier (or permanently connected
amplifier module), the amplifier and force transducer form a measurement chain that
cannot be separated. The measurement chain is calibrated as a unit accordingly.
The digital sensors output the measurement result in Newtons. Here in the test record
you will find a table indicating the measured value that is outputted at a set force.
Due to the very low measurement error of the digital sensors, the difference between
the two values is very small.
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U10M
ELECTRICAL CONNECTION
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