I
n systems without potential equalisation with cable screening on both
sides
,
connect the cable screen directly to ground potential at the
power supply unit and at the sensor
.
I
n the connection box or
T
-
distributor
,
the screen of the short stub to the sensor must not be
connected to ground potential or to another cable screen
.
T
he cable
screens to the power supply unit and to the next distributor must be
connected to each other and also connected to ground potential via a
ceramic capacitor
(
e
.
g
.
1
n
F
,
1500
V
).
L
ow
-
frequency potential
equalisation currents are thus suppressed
,
but the protective e
ff
ect
against high frequency interference signals remains
.
T
he voltage supply and signal output are connected via the spring
-
loaded terminals in the housing
.
T
he connection to the indicating and adjustment module or to the
interface adapter is carried out via contact pins in the housing
.
P
roceed as follows
:
T
he procedure applies to instruments without explosion protection
.
1
U
nscrew the big housing cover
2
L
oosen compression nut of the cable entry
3
R
emove approx
.
10
cm
(
4
in
)
of the cable mantle
,
strip approx
.
1
cm
(
0
.
4
in
)
of insulation from the ends of the individual wires
C
onnection technology
C
onnection procedure
POINTRAC
31
•
F
oundation
F
ieldbus
17
5
C
onnecting to power supply
41779
-
EN
-
120329
