Wiring Plans - Vega VEGASCAN 693 Operating Instructions Manual

Electrical connection
Wiring plan for two-wire sen-
sors
14
separate power supply (sensors in four-wire version). The
connection and operation in Ex ia is not permitted on the
passive input.
Note:
VEGASCAN 693 is designed for connection of up to 15 HART
sensors (5 with Ex). Because they are accessed via different
addresses in the HART multidrop mode, all sensors must be
connected to the same sensor input. These are either
terminals 1/2 (active input) or terminals 3/4 (passive input).
Mixed operation of active and passive input is not possible.
Since this is a digital bus system, only one two-wire cable
should lead to the sensors. A distributor can then be
connected directly forward of the sensors. As an alternative,
the connection cable can be looped through the second cable
entry on the sensor housing.

5.3 Wiring plans

8
Fig. 3: Connection example VEGASCAN 693 with two-wire sensors
1 Measured data input with sensor supply (active input)
2 Measured data input (passive input), not in Ex ia
3 Internal fail safe relay
4 Distributor
5 Power supply of VEGASCAN 693
6 HART two-wire sensor with Multidrop address 1
7 HART two-wire sensor with Multidrop address 2
8 HART two-wire sensor with Multidrop address 3
VEGASCAN 693 - 15-channel HART signal conditioning instrument
+ -
1 2
1
4
9 10
17 18 19 20 21 22
+ -
7 6
L1 N
5
3
+ -
3 4 5 6 7 8
2
11 12 13 14 15 16
23 24 25 26 27 28