5
C
onnecting to voltage supply
5
.
1
P
reparing the connection
G
enerally not 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
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
.
T
he voltage supply of the module card is provide via the
common power supply unit of the
VEGALOG
system
.
Y
ou can
fi
nd detailed information on the power supply in the
"
T
echnical data
"
in the
"
S
upplement
"
.
5
.
2
C
onnection cable
P
ower supply is connected with standard cable according to
the national installation standards
.
T
o connect the transistor outputs
,
standard two
-
wire cable
without screen can be used
.
I
f electromagnetic interference is
expected which is above the test values of
EN
61326
for
industrial areas
,
screened cable should be used
.
C
onnect the cable screen on both ends to ground potential
.
I
f potential equalisation currents are expected
,
the screen
connection on the side of
VEGALOG
571
AT
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 interference signals
remains
.
T
ake note of the corresponding installation regulations for
E
x
applications
.
I
n particular
,
make sure that no potential equal
-
isation currents
fl
ow over the cable screen
.
I
n case of
grounding on both sides this can be achieved by the use of a
capacitor or a separate potential equalisation
.
T
he total capacitance of the cable and of all capacitors must
not exceed
10
n
F
in
E
x applications
.
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 screening and ground
-
ing
S
elect connection
cable for
E
x applica
-
tions
VEGALOG
571
AT
-
O
utput card transistor
11
C
onnecting to voltage supply
31951
-
EN
-
060720
Содержание VEGALOG 571 AT
Страница 1: ...Operating Instructions VEGALOG 571 AT Output card transistor on VEGALOG VEGALOG 571 AT in in out out...
Страница 10: ...1 Fig 2 Detail coded pin mounting 1 Coded pin 10 VEGALOG 571 AT Output card transistor Mounting 31951 EN 060720...
Страница 21: ...VEGALOG 571 AT Output card transistor 21 Supplement 31951 EN 060720...
Страница 22: ...22 VEGALOG 571 AT Output card transistor Supplement 31951 EN 060720...
Страница 23: ...VEGALOG 571 AT Output card transistor 23 Supplement 31951 EN 060720...
