Operating instructions

13
5 Connecting to power supply
VEGAMET 625 • Double channel HART
28970-EN-150129
Note:
With a VEGAMET 625 in Ex version, the passive input is not availble
for approval technical reasons.
5.3 Connection procedure
VEGAMET 625 is designed for connection of two HART sensors.
BecausetheyareaccessedviadierentaddressesintheHART
multidrop mode, both sensors are connected to the same sensor
input. These are either terminals 1/2 (active input) or terminals 3/4
(passive input). Simultaneous mixed operation on active and passive
input is not possible. The measured value transmission is carried out
via the digital HART signal. An analogue 4 … 20 mA transmission is
not possible.
Because this is a digital bus system, only one two-wire cable should
lead to the two sensors. A distributor can be connected directly in
front of the sensors. As an alternative, the connection to the next sen-
sor can be continued via the second cable entry in the sensor hous-
ing. Before connection, the addressing the sensors should be carried
out,seechapter"Setup".
Note:
Before the actual setup, each HART sensors must be assigned an
address(addressrange1-15),(seechapter"Setup").Address0
(mode 4 … 20 mA) must not be used. When assigning an address,
only one sensor should be connected to VEGAMET 625. If connec-
tioniscompletedalready,thewiringmustbebrieycancelledfor
addressing. Depending on the installation location of the sensors, it
can be advantageous to carry out this addressing before installing
and connecting the sensors. This can be conveniently carried out
e.g. in the workshop. You just need a 24 Volt power supply as well as
an indicating and adjustment module PLICSCOM or the adjustment
software PACTware with VEGACONNECT.
Move on to electrical connection and proceed as follows:
1. Snap the socket without VEGAMET 625 onto the carrier rail
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o)toterminal17and18
5. If necessary, connect relays or other outputs
6. Insert VEGAMET 625 into the plug-in socket and screw it down
tightly
Note:
If the addressing of the sensors has not yet been carried out, only one
sensormustbeconnected.Addressing(seechapter"Setup")ofthe
rstsensorcanthenbecarriedout.Afterwards,therstsensormust
be disconnected again and the next sensor connected and provided
with an address. Then all sensors can be connected and setup can
be started.