14
U
2B
H
BM
A03823.3en/de/fr
5
Electrical c
onn
ecti
on
5.1
N
o
tes
on
cabli
ng
Electrical and magnetic fields often cause noise
v
oltage induction in the mea
suring circuit. This interference arises most commonl
y
from highpo
w
er trans
mission lines running parallel to the measuring circuits, but ma
y
also come
from nearb
y
protecti
v
e contacts or electric motors.
N
oise
v
oltage induction
can also occur on gal
v
anic paths, especiall
y
if the measuring equipment is
earthed at se
v
eral points.
Please note the follo
w
ing instructions:
•
U
se onl
y
shielded, lo
w
capacitance measuring cable from
H
BM.
•
La
y
measuring cable so that it is not parallel to hightension lines or control
circuits. If this is not possible (e.g. in cable shafts), protect the measuring
cable
w
ith e.g. steel conduit and keep it at least 50 cm a
w
a
y
from the other
cables.
H
ightension lines or control circuits should be t
w
isted (15 turns per
metre).
•
Stra
y
fields from transformers, motors and protecti
v
e contacts must be
a
v
oided.
•
Do not multiearth transducers, amplifiers and displa
y
de
v
ices. All de
v
ices
in the measuring s
y
stem must be connected to the same protection circuit.
•
Link the connector cable shield to the transducer housing.
•
C
onnection diagram, earthing scheme (GreenLine)
Содержание U2B
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