Vega VEGAPULS 67 Product Information - page 12
12
Electronics - 4 … 20 mA/HART - four-wire
Radar - Level measurement in bulk solids
29427-EN-160312
8 Electronics - 4 … 20 mA/HART - four-wire
Configurationoftheelectronics
The plug-in electronics is mounted in the electronics compartment of the
instrument and can be exchanged by the user when servicing is required.
The electronics is completely encapsulated to protect against vibration
and moisture.
The contact pins with I²C interface for parameter adjustment are located
on the upper side of the electronics. The terminals for the power supply
are located in the separate connection compartment.
Voltage supply
If a reliable separation is required, the power supply and the current
output are transmitted over separate two-wire connection cables.
•
Operating voltage with version for low voltage
– 9.6 … 48 V DC, 20 … 42 V AC, 50/60 Hz
•
Operating voltage with version for mains voltage
– 90 … 253 V AC, 50/60 Hz
Connectioncable
The 4 … 20 mA current output is connected with standard two-wire
cable without screen. If electromagnetic interference is expected which
is above the test values of EN 61326 for industrial areas, screened cable
should be used.
For power supply, an approved installation cable with PE conductor is
required.
Cablescreeningandgrounding
If screened cable is required, we recommend connecting the cable
screen on both ends to ground potential. In the sensor, the screen should
be connected directly to the internal ground terminal. The ground terminal
on the outside of the housing must be connected to the ground potential
(with low impedance).
Connection,doublechamberhousing
power supply
4...20mA
active
passive
commo
n
IS GN
D
5
1
/L
/N
PE
2
+
( )
(-)
6 7
8
Fig. 22: Terminal compartment, double chamber housing
1 Voltage supply
2 4 … 20 mA signal output active
3 4 … 20 mA signal output passive
Terminal
Function
Polarity
1
Voltage supply
+/L
2
Voltage supply
-/N
5
4 … 20 mA output (active)
+
6
4 … 20 mA output (passive)
+
7
Mass - output
-
8
Functional ground with installa-
tion according to CSA