User's Manual

Table Of Contents
Electrical connection
40 A3452-10.0 T40B
mitter head and the rotor from electromagnetic interfer
ence.
The cable shield is connected with the transducer hous
ing. This encloses the measurement system (without the
rotor) in a Faraday cage when the shield is laid flat at
both ends of the cable. With other connection tech
niques, an EMCproof shield should be applied in the
wire area, and this shielding should also be connected
extensively (also see HBM Greenline Information,
brochure i1577).
Electrical and magnetic fields often induce interference
voltages in the measuring circuit. Therefore:
S Use shielded, low‐capacitance measurement cables
only (HBM cables fulfill both conditions).
S Only use plugs that meet EMC guidelines.
S Do not route the measurement cables parallel to
power lines and control circuits. If this is not possible,
protect the measurement cable with e.g. steel con
duit.
S Avoid stray fields from transformers, motors and con
tact switches.
S Do not ground the transducer, amplifier and indicator
more than once.
S Connect all devices in the measuring chain to the
same protective earth conductor.
S In the case of interference due to potential differences
(compensating currents), the connections between
supply voltage zero and housing ground must be bro
ken at the amplifier and a potential equalization line
established between the stator housing and the ampli
fier housing (copper conductor, at least 10 mm
2
wire
cross‐section).