VEGA VEGASEL 643 - Manual (Page 8)

8 VEGASEL 643
4 3
+ –
1 2
9 10
+ –
L1
+ N
–
VEGASEL 643
7 8
+ –
10 V
11 12 13 14
3.2 Wiring plan
Electrical connection
3 Electrical connection
3.1 Wiring instruction
The following wiring plan and the extension examples
1 and 2 are valid for standard as well as for Ex-ver-
sions of the signal conditioning instruments. Please
note the following instructions:
-
the relay contact is shown in unpressurized
condition
- if strong electromagnetic interferences are ex-
pected, we recommend to use screened cable for
the signal lines
- the screening must only be earthed at one sensor
side
- in case of overvoltages we recommend the use of
VEGA-overvoltage arresters
- the connection must be made according to the
appropriate national installation standards (e.g. in
Germany according to VDE-regulations).
passive voltage input for
connection to the voltage
output of a signal conditioning
instrument (VEGAMET…)
Relay output
Supply voltage
passive current input for
connection of a signal condi-
tioning instrument
(VEGAMET…)
active current input for connec-
tion of a sensor (4 … 20 mA)
Sensor