VEGA VEGAMET 381 - Manual (Page 23)

23
5 Connecting to power supply
VEGAMET 381 • 4 … 20 mA signal conditioning instrument
27567-01-131025
4. Insert the instrument from the front into the
front panel [1].
5. Place the clamping strap [2] from the back
over the pin [3] and pull it with the knurled
nut [4] against the panel [1].
1
3 2 4
Abb. 10: Front panel mounting
1 Front panel
2 Clamping bracket
3 Pin
4 Knurled nut
Screw mounting
1. Insert the metal strap [1] from above into the
housing cut-out.
2. Fasten the instrument directly to the wall
with the three screws (max. ø 4 mm).
105
80
ø 4,5*
1
Abb. 11: Screw mounting
1 Metal strap
Carrier rail mounting
1. Place the adapter plate [1] to the rear of
VEGAMET 381 (spring of the adapter plate
downward) and fasten the plate with screw
[2] (M4 x 6).
2. PlaceVEGAMET 381 against the carrier
rail [3] from below and push the instrument
upward until it snaps in.
61
43,5
2 1 3
Abb. 12: Carrier rail mounting
1 Adapter plate
2 Screw (M4 x 6)
3 Carrier rail
5 Connecting to power
supply
5.1 Preparing the connection
Note safety instructions
Always keep in mind the following safety inst-
ructions:
•
Connect only in the complete absence of
line voltage
•
If overvoltage surges are expected, overvol-
tage arresters should be installed
Take note of safety instructions for Ex
applications
In hazardous areas you must take note
of the respective regulations, conformity
and type approval certificates of the
sensors and power supply units.
Select power supply
The power supply can be 20 … 253 V AC,
50/60 Hz or 20 … 253 V DC.
Select connection cable
The operating voltage of VEGAMET 381 is
connected with standard cable according to the
national installation standards.
The instrument is connected with standard
two-wire cable without screen. If electromag-
netic interference is expected which is above
the test values of EN 61326 for industrial areas,
screened cable should be used.
Cable screening and grounding
Connect the cable screen on both ends to
ground potential. In the sensor, the screen must
be connected directly to the internal ground
terminal. The ground terminal outside on the
sensor housing must be connected to the
potential equalisation.