VEGA VEGAMET 391 With SIL qualification - Manual (Page 13)

13
5 Connecting to power supply
VEGAMET 391 • With SIL qualification
38704-EN-130228
5 Connecting to power supply
5.1 Preparing the connection
Always keep in mind the following safety instructions:
•
Connect only in the complete absence of line voltage
•
If overvoltage surges are expected, overvoltage arresters should
be installed
In hazardous areas you must take note of the respective regulations,
conformity and type approval certificates of the sensors and power
supply units.
The voltage supply can be 20 … 253 V AC/DC, 50/60 Hz.
The operating voltage of VEGAMET 391 mit SIL-Qualifikation is
connected with standard cable according to the national installation
standards.
To connect the sensors, standard two-wire cable can be used. If elec-
tromagnetic interference is expected which is above the test values of
EN 61326 for industrial areas, screened cable should be used.
5.2 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)
4. If necessary, connect digital inputs to 8/9 and 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. Connect current output (if not needed, it should be short-circuit-
ed)
9. If necessary, connect relays or other outputs
10. Plug in terminal strip 2 on the lower side of the instrument
11. For connection of additional relais to terminal strip 3, you have to
proceed as described earlier
The electrical connection is hence finished.
Note:
If the current output is not needed, the terminals must be short-
circuited, because the output is monitored and a failure message is
outputted when being interrupted.
Remember that with Ex applications, the Ex separating wall must be
plugged onto the upper side of the instrument before setup.
Information:
On the active input (terminal 1/2), VEGAMET 391 mit SIL-Qualifika-
tion provides power for the connected sensors. Power supply and
Note safety instructions
Take note of safety
instructions for Ex
applications
Select power supply
Select connection cable