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T10FS
5
Electrical connection
5.1 General instructions
We recommend to use shielded, low−capacitance cable from HBM for the
electrical connection between torque transducer and measuring amplifier.
With cable extensions it is important to ensure that a good connection is
provided, with minimum contact resistance and good insulation. All plug
connections or cap nuts have to be tightened firmly.
Do not route measurement cables in parallel to power lines and control circuits.
If this is not possible (for example in cable ducts), maintain a minimum
distance of 50 cm and protect the cable with a steel tube.
Avoid transformers, motors, contactors, thyristor controllers and similar
sources of stray fields.
CAUTION
Transducer connection cables from HBM with attached connectors are
identified in accordance with their intended purpose (Md or n). When
cables are shortened, inserted into cable ducts or installed in control
cabinets, this identification can get lost or become concealed. If this is
the case, it is essential for the cables to be re labeled!
5.2 Shielding design
The cable shielding is connected in accordance with the Greenline concept.
This encloses the measuring system (without a rotor) in a Faraday cage. It is
important that the shield is laid flat on the housing ground at both ends of the
cable. Any electromagnetic interference active here does not affect the
measurement signal. Special electronic coding methods are used to protect the
transmission path and the rotor from electromagnetic interference.
In the case of interference due to potential differences (compensating
currents), operating voltage zero and housing ground must be disconnected on
the amplifier and a potential equalization line established between the stator
housing and the amplifier housing (copper conductor, 10mm
cross section).
If potential differences arise between the rotor and the stator on the machine,
perhaps due to unchecked leakage, and this causes interference, it can usually
be overcome by connecting the rotor directly to earth, for instance by a wire
loop. The stator should be fully earthed in the same way.
A0785 14.0 en
33
2
wire
HBM
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