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 arresters
B
61
-
300
(
power supply
VEGATOR
632
)
and
B
62
-
36
G
(
sensor supply
).
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 power supply can be
85
…
253
V AC
,
50
/
60
H
z or
20
…
60
V DC
.
T
he operating voltage of
VEGATOR
632
is connected with standard
cable according to the national installation standards
.
T
he line
resistance must be max
.
25
Ω
per wire
.
I
f electromagnetic interference
is expected which is above the test values of
EN
61326
for industrial
areas
,
screened cable should be used
.
I
f screened cable is necessary
,
connect the cable screen on both ends
to ground potential
.
I
n the sensor
,
the screen must be connected
directly to the internal ground terminal
.
T
he ground terminal on the
outside of the housing must be connected to the potential equalisation
(
low impedance
).
I
f potential equalisation currents are expected
,
the connection on the
processing side must be made via a ceramic capacitor
(
e
.
g
.
1
n
F
,
1500
V
).
T
he low frequency potential equalisation currents are thus
suppressed
,
but the protective e
ff
ect against high frequency interfer
-
ence signals remains
.
T
ake note of the corresponding installation regulations for
E
x
applications
.
N
ote safety instructions
T
ake note of sa
-
fety instructions
for
E
x applica
-
tions
S
elect power supply
S
electing connection
cable
C
able screening and
grounding
S
elect connec
-
tion cable for
E
x
applications
12
VEGATOR
632
•
S
ignal conditioning instrument
5
C
onnecting to power supply
35243
-
EN
-
120228