VEGA VEGAPULS 56V - Manual (Page 18)

18 VEGAPULS 56V
VEGALOG
571 CPU
VEGALOG
571 EV
2
2
CPU
2 2
2
2
2
4
4
4
Measuring system with 15 VEGAPULS 56V Ex, 56V Ex0 with pressure tight
encapsulated connection box via one two-wire line on the processing
system VEGALOG 571
• Two-wire technology, voltage supply and digital output signals via one two-wire line from the
processing system VEGALOG 571
• Up to 15 sensors on one two-wire line, for operation in Ex zone 1 (VEGAPULS 56V␣ Ex) or
Ex zone 0 applications (VEGAPULS 56V␣ Ex0)
• Measured value indication integrated in the sensor
• Optionally external indicating instrument with analogue and digital indication (can be
mounted up to 25 m separated from the sensor)
• Adjustment with or without adjustment module MINICOM (can be plugged into the sensor or
into the external indicating instrument VEGADIS 50)
• Max. resistance of the signal line 15␣
Ω
per wire or 1000␣ m cable length
Types and versions
VEGADIS 50
VEGADIS 50
Screened line in case of electromag-
netic interferences
1)
Current outputs
Voltage outputs
Relays
Digital connectability
Fault signals
Connection to all
BUS-systems
Transistor outputs
VEGADIS 50
VEGAPULS 56V
(15 sensors per
two-wire line
individual group-
ing)
Processing system VEGA-
LOG 571 with input cards in
19“-rack. 15 sensors on one
module card and two-wire
line
Ex-area Non-Ex-area
EEx d ia EEx e
1) Sensor lines should be looped in screened cables. Earth the
cable screens on the processing system or better on the sensor.
In case of stronger electromagnetic interferences it is useful to
earth the cable screens on both ends. However it must be noted
that no earth compensation currents flow via the screens. In
case of earthing on both sides earth compensation currents are
avoided by connecting the cable screen on one earth side (e.g.
in the switching cabinet) via a capacitor (e.g. 0,1␣
µ
F; 250␣ V) to
the earth potential.
Zone 1
Zone 0
Zone 1
Zone 0