VEGA VEGAPULS 45 VBUS - Manual (Page 41)

VEGAPULS 42, 44 and 45 – VBUS 41
Electrical connection
5 sensors per two-wire cable via VEGATRENN 548V Ex separator
on the VEGALOG 571 processing system
• 5 sensors with power supply and digital output signals via one two-wire cable on the sepa-
rator.
• Display of measured values integrated in the sensor.
• Optional external indicating instrument (can be mounted up to 25 m away from the sensor
also in Ex area).
• Adjustment with PC or adjustment module MINICOM (can be plugged into the sensor or into
the external indicating instrument VEGADIS 50).
• Max. resistance of the signal cable 15
Ω
per wire, max. 1000 m cable length (see also ap-
proval certificates of the separators and technical data).
"ia"
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
VEGALOG
571 CPU
VEGALOG
571 EV
CPU
VEGATRENN
548
VEGATRENN
548
VEGATRENN
548
VEGALOG
571 EV
VEGATRENN
548
VEGATRENN
548
Ex area Non-Ex area
Processings see also
Product Information
"Signal conditioning
instruments series
500". Current outputs
etc. like image on
previous page
Screened cable in case of electromagnetic
interferences
1)
VEGALOG 571
processing system
(19" module card)
5 sensors per two-wire cable
individual grouping
Input card of VEGALOG 571 (max. 15
sensors per card)
VEGATRENN 548V Ex
separator (max. 15
sensors per card)
1) Sensor wiring should be looped in screened cables. In case of high frequency
interference (> 1 MHz) it is best to ground the cable screens on both ends.
Please make sure that no earth compensation currents flow via the screens.
You avoid earth compensation currents (when grounding at both ends) by
connecting the cable screen on one end (e.g. in the switching cabinet) via a
capacitor (e.g. 10 nF; 1500 V) with the ground potential. Sensor cables
leading to the same separator card can be looped together in one screened
multiwire cable. Sensor cables leading to other separator cards must be
looped in separate screened cables.
Interface cable RS 232
VEGACONNECT 2
VEGADIS 50
Input card of
VEGALOG 571
EEx ia
EEx ia