VEGA VEGAPULS 56V - Manual (Page 14)

14 VEGAPULS 56V
2
2
4
4
VEGAMET
515V
VEGATRENN
547
2
Types and versions
Measuring system with 1 … 2 VEGAPULS 56V Ex, 56V Ex0 via a separator
VEGATRENN 548V Ex on the signal conditioning instrument VEGAMET 515V
• Two-wire technology, intrinsically safe ia-supply from the separator, for operation in Ex
zone 1 (VEGAPULS 56V␣ Ex) or Ex zone 0 applications (VEGAPULS 56V␣ Ex0)
• Ex-area according to CENELEC and ATEX
• Digital output signal, two sensors on one line
• Optionally external indicating instrument with analogue and digital indication (can be
mounted up to 25 m separated from the sensor)
• Adjustment with PC, signal conditioning instrument or 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 (see also approval
certificate of the separators)
VEGADIS 50
VEGADIS 50
VEGACONNECT 2
Screened line in case of electromag-
netic interferences
1)
Signal conditioning instru-
ment VEGAMET 515V with
Ex-separator VEGATRENN
548V␣ Ex in housing type 506
Current outputs
Voltage outputs
Relays
Digital
connectability
Fault signals
Ex-area Non-Ex-area
EEx ia
EEx ia
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.
Note!
In Ex-systems earthing on both sides is not
allowed due to the potential difference.