Connection Procedure - Vega VEGAMET 391 Operating Instructions Manual

VEGAMET 391 • 4 ... 20 mA/HART
over the same two-wire cable. This mode is provided for connec-
tion of measuring transducers without separate power supply
(sensors in two-wire version).
•
In passive mode the sensors are not powered, only the measured
value is transmitted. This input is for connection of transmitters
with their own separate voltage supply (sensors in four-wire ver-
sion). The VEGAMET 391 can also be looped into the existing
circuit like a normal ammeter.
Note:
With a VEGAMET 391 in Ex version, the passive input is not available
for approval technical reasons.
5.3

Connection procedure

Move on to electrical connection and proceed as follows:
1. Mount the instrument as described in the previous chapter
2. Remove terminal strip 1 on the upper side of the instrument
3. Connect sensor cable to terminal 1/2 (active input) or 5/6 (passive
input)
4. If necessary, connect digital inputs to 8 ... 12
5. Plug terminal strip 1 to the upper side of the instrument
6. Remove terminal strip 2 on the lower side of the instrument
7. Connect power supply (switched off) to terminal 13/14
8. If necessary, connect relays or other outputs
9. Plug in terminal strip 2 on the lower side of the instrument
10. For connection of additional relais to terminal strip 3, you have to
proceed as described earlier
The electrical connection is finished.
Remember that with Ex applications, the Ex separating wall must be
plugged onto the upper side of the instrument before setup.
5 Connecting to power supply
15