VEGA VEGASTAB 690 - Manual (Page 7)

VEGASTAB 690 7
Electrical connection
3 Electrical connection
3.1 Connection instructions
The following connection plan is valid for
standard as well as for Ex measuring sys-
tems. Please observe the following instruc-
tions:
-
If strong electromagnetic interferences are
expected, screened cable is recom-
mended for the signal cables.
- The screening must be earthed only on
one (sensor) end.
- If overvoltages are expected, we recom-
mend the use of VEGA overvoltage ar-
resters.
- The connection must be made according
to the appropriate national installation
standards (e.g. in Germany acc. to the
VDE regulations).
3.2 Connection instructions
for approved applications
In Ex applications, the voltage supply of the
sensor must be provided only via an intrinsi-
cally safe circuit.
By using ia safety barriers type 145, intrinsi-
cally safe circuits can be prepared, see „3.4
Connection examples“.
Please also note the official document of the
ia safety barrier.
3.3 Connection plan
1 2 4
9 10
3
+ – + –
+ –
L1 N
VEGASTAB 690
Output 1 for sensor 1
Output 2 for sensor 2
Voltage supply