
5
C
onnecting to power supply
5
.
1
P
reparing the connection
A
lways observe the following safety instructions
:
l
C
onnect only in the complete absence of line voltage
l
I
f overvoltages are expected
,
overvoltage arresters should
be installed acc
.
to
P
ro
fi
bus speci
fi
cation
.
I
n hazardous areas you should take note of the appropriate
regulations
,
conformity and type approval certi
fi
cates of the
sensors and power supply units
.
P
ower is supplied via a
P
ro
fi
bus
DP
/
PA
segment coupler or a
VEGALOG
571
EP
input card
.
T
he power supply range can
di
ff
er depending on the instrument version
.
T
he exact range is
stated in the
"
T
echnical data
"
in the
"
S
upplement
"
.
VEGABAR
53
is connected with screened cable acc
.
to the
P
ro
fi
bus speci
fi
cation
.
P
ower supply and digital bus signal are
carried over the same two
-
wire connection cable
.
A
n outer cable diameter of
5
…
9
mm ensures the seal e
ff
ect
of the cable entry
.
P
lease make sure that your installation is carried out acc
.
to
the
P
ro
fi
bus speci
fi
cation
.
I
n particular
,
make sure that the
termination of the bus is done with appropriate terminating
resistors
.
W
hen using
VEGABAR
53
with cable entry
1
/
2
"
NPT
and
plastic housing
,
a metal
1
/
2
"
threaded insert is moulded into
the plastic housing
.
C
aution
:
N
o grease should be used when screwing the
NPT
cable
gland or steel tube into the threaded insert
.
S
tandard grease
can contain additives a
ff
ecting the connection between
threaded insert and housing
.
T
his will in
fl
uence the stability of
the connection and the tightness of the housing
.
I
n systems with potential equalisation
,
connect the cable
screen directly to ground potential at the power supply unit
,
in
the connection box and at the sensor
.
T
he screen in the sensor
N
ote safety instructions
T
ake note of safety
instructions for
E
x
applications
S
elect power supply
S
electing the connection ca
-
ble
C
able entry
1
/
2
"
NPT
C
able screening and ground
-
ing
VEGABAR
53
-
P
ro
fi
bus
PA
13
C
onnecting to power supply
28250
-
EN
-
051004
Содержание VEGABAR 53
Страница 1: ...Operating Instructions VEGABAR 53 Pro bus PA p...
Страница 57: ...Manufacturer declaration Fig 27 Manufacturer declaration VEGABAR 53 Pro bus PA 57 Supplement 28250 EN 051004...
Страница 58: ...10 5 Industrial property rights 58 VEGABAR 53 Pro bus PA Supplement 28250 EN 051004...
Страница 59: ...VEGABAR 53 Pro bus PA 59 Supplement 28250 EN 051004...