Vega VEGABAR 17, Руководство по эксплуатации

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5
C onnecting 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
VEGA
overvoltage arrester Ü
SB
62
-
36
G . X .
I
n hazardous areas you must take note of the respective regulations
,
conformity and type approval certi
fi
cates of the sensors and power
supply units
.
T
he supply voltage and the current signal are carried on the same two
-
wire connection cable
.
P
rovide a reliable separation between the supply circuit and the mains
circuits according to
DIN VDE
0106
part
101
.
VEGA
power supply units
VEGATRENN
149
AE
x
, VEGASTAB
690
,
VEGADIS
371
as well as all
VEGAMET
s meet this requirement
. W
hen
using one of these instruments
,
protection class
III
is ensured for
VEGABAR
17
.
K
eep in mind the following additional factors that in
fl
uence 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
.
U
se cable with round cross
-
section
. A
cable outer diameter of
5
…
9
mm
(
0
.
2
…
0
.
35
in
)
ensures the seal e
ff
ect of the cable gland
. I
f you are
using cable with a di
ff
erent diameter or cross
-
section
,
exchange the
seal or use a suitable cable gland
.
F
or the version with round plug connector
M
12
x
1
,
a suitable
,
ready
-
made connection cable
(
article no
. ASL .
1
S .)
in
5
m
,
10
m or
25
m
lengths is available from the line of
VEGA
accessories
.
N ote safety instructions
T
ake note of sa
-
fety instructions
for
E x applica -
tions
S elect power supply
S elect connection cable
12
VEGABAR
17
5
C
onnecting to power supply
27636
-
EN
-
120531