Connection Procedure; Wiring Plan - Vega VEGATRENN 149A Ex Instrucciones De Servicio

5 Connecting to power supply
sensors and power supply units.
5.2

Connection procedure

Voltage supply
Make sure that the voltage corresponds to the
specifications on the type label.
In the voltage range of 90 ... 230 V AC, an easi-
ly accessible switch marked as cut-off switch as
well as an overload protection device (nominal
current ≤ 10 A) must be installed in the feed
circuit near the instrument.
L / +
Abb. 8: Connection voltage supply
Sensor circuit (Ex area)
The sensor must be connected to the blue
connection terminals I+ and I-. The sensor
circuit of the separator VEGATRENN 149A Ex is
separated from the processing circuit.
The sensor circuit is active, this means that the
connected sensor is powered by VEGATRENN
149A Ex.
I +
Abb. 9: Connection sensor circuit
1 Ex area
2 Non-Ex area
Processing circuit (non-Ex area)
Processing systems such as e.g. an indicating
instrument or a PLC system are connected to
terminals O+/O-/O+H.
If a HART handheld or an interface adapter VE-
GACONNECT is connected to the communica-
tion sockets in the front, the processing system
must be connected to terminals O+H and O-.
The resistance necessary for HART commu-
nication is already integrated in VEGATRENN
149A Ex with this version. Keep in mind that
in this case the max. connectable load or load
resistance is reduced (see "Technical data" in
16
N / -
1
2
I -
the "Supplement").
Hart
Abb. 10: Connection example with HART communi-
cation
Abb. 11: Connection example without HART commu-
nication
5.3

Wiring plan

Terminal assignment
1
2
3 4
Abb. 12: Wiring plan VEGATRENN 149A Ex
1 Sensor circuit
2 HART communication socket
3 Processing circuit
4 Voltage supply
VEGATRENN 149A Ex • Ex-separator for 4 ... 20 mA/HART
0+ 0-
VEGADIS 175 OK
0+ 0-
VEGADIS 175
OK
I + I –
0 +
0 +
0 – L / +
H a r t
N / –