VEGA VEGASCAN 693 - Manual (Page 13)

13
5 Electrical connection
VEGASCAN 693 • 15-channel HART signal conditioning instrument
29252-EN-130701
2. Connect sensor cable to terminal 1/2 (active input) or 3/4 (passive
input), provide a screening
3. When using several sockets, loop the power supply by means of
bridges
4. Connect power supply (switched off) to terminal 17 and 18
5. If necessary, connect relays or other outputs
6. Insert VEGASCAN 693 into the plug-in socket and screw it down
tightly
Note:
If the addressing of the sensors is not yet carried out, only one sensor
must be connected. Then the addressing (see chapter "Setup") is car-
ried out. Afterwards, the first sensor must be disconnected again and
the next sensor must be connected as well as the addressing must be
carried out. Carry out this procedure as long as all sensors have an
own, unambiguous address. Then all sensors can be connected and
setup can be carried out.
Before setting up Ex versions, make sure the Ex separating chamber
is plugged on the left housing side (above the sensor terminals). The
pins for type and Ex coding must also be inserted correctly.
Information:
•
On the active input (terminal 1/2), VEGASCAN 693 provides
power for the connected sensors. Power supply and measurement
data are transmitted over the same two-wire cable. This mode is
provided for connection of measuring transducers without sepa-
rate operating voltage (sensors in two-wire version).
•
On the passive input (terminals 3/4), the sensors are not supplied
with energy - only the measured value is transmitted. This input is
for instruments with their own separate operating voltage (sensors
in four-wire version or separators such as VEGATRENN 149). On
a VEGASCAN 693 in Ex version, the passive input is not available
due to approval/technical reasons.
Note:
VEGASCAN 693 is designed for connection of up to 15 HART sen-
sors (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 pas-
sive 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 con-
nection cable can be looped through the second cable entry on the
sensor housing. The address assignment of the sensors should be
carried out before connection, see chapter "Set up".