5
C
onnect to power supply
5
.
1
P
reparing the connection
A
lways keep in mind the following safety instructions
:
l
C
onnect only in the complete absence of line voltage
l
I
f overvoltage surges are expected
,
overvoltage arresters should
be installed
T
ip
:
W
e recommend using
VEGA
overvoltage arresters
B
63
-
48
and
Ü
SB
62
-
36
G
.
X
.
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 supply and current signal are carried on the same two
-
wire
cable
.
T
he voltage supply range can di
ff
er depending on the
instrument version
.
T
he data for power supply are speci
fi
ed in chapter
"
T
echnical data
"
.
P
rovide a reliable separation between the supply circuit and the mains
circuits according to
DIN VDE
0106
part
101
.
T
he
VEGA
power supply
units
VEGATRENN
149
A E
x
,
VEGASTAB
690
as well as all
VEGAMET
s and
VEGASCAN
s meet this requirement
.
I
nformation
:
T
he signal conditioning instruments
VEGAMET
624
and
625
as well as
VEGASCAN
693
have a digital sensor recognition
.
W
hen connecting
VEGAFLEX
62
,
a software version from
1
.
92
is required with the signal
conditioning instrument
.
F
or software update move under
"
www
.
vega
.
com
/
downloads
"
to
"
S
oftware
"
.
K
eep in mind the following additional in
fl
uences on the operating
voltage
:
l
O
utput voltage of the power supply unit can be lower under
nominal load
(
with a sensor current of
20
.
5
m
A
or
22
m
A
in case of
fault message
)
l
I
n
fl
uence of additional instruments in the circuit
(
see load values in
chapter
"
T
echnical data
"
)
T
he instrument is connected with standard two
-
wire cable without
screen
.
I
f electromagnetic interference is expected which is above the
test values of
EN
61326
for industrial areas
,
screened cable should be
used
.
S
afety instructions
P
ower supply
C
onnection cable
20
VEGAFLEX
62
•
4
…
20
m
A
/
HART
two
-
wire
5
C
onnect to power supply
31837
-
EN
-
090831