Vega VEGABAR 17 Operating Instructions Manual - page 11
11
5 Connecting to power supply
VEGABAR 17 •
27636-EN-150224
5 Connecting to power supply
5.1 Preparing the connection
Always keep in mind the following safety instructions:
•
Connect only in the complete absence of line voltage
•
If overvoltage surges are expected, overvoltage arresters should
be installed.
Tip:
We recommend VEGA overvoltage arrester ÜSB 62-36G.X.
Inhazardousareasyoumusttakenoteoftherespectiveregulations,
conformityandtypeapprovalcertificatesofthesensorsandpower
supply units.
The supply voltage and the current signal are carried on the same
two-wire connection cable.
Provide a reliable separation between the supply circuit and the
mains circuits according to DIN EN 61140 VDE 0140-1.
VEGA power supply units VEGATRENN 149AEx, VEGASTAB 690,
VEGADIS 371 as well as all VEGAMETs meet this requirement. When
using one of these instruments, protection class III is ensured for
VEGABAR 17.
Keepinmindthefollowingadditionalfactorsthatinfluencetheoperat-
ing voltage:
•
Output voltage of the power supply unit can be lower under nomi-
nal load (with a sensor current of 20.5 mA or 22 mA in case of fault
message)
•
Influenceofadditionalinstrumentsinthecircuit(seeloadvaluesin
chapter "Technical data")
The instrument 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.
Use cable with round cross-section. A suitable cable outer diameter
of (see chapter "Technical data")ensuresthesealeffectofthecable
gland.Ifyouareusingcablewithadifferentdiameterorcross-sec-
tion, exchange the seal or use a suitable cable gland.
For the version with round plug connector M12 x 1, a suitable, ready-
made connection cable (article no. ASL.1S.) in 5 m, 10 m or 25 m
lengths is available from the line of VEGA accessories.
If screened cable is required, connect the cable screen on both ends
to ground potential.
In Ex systems, the grounding is carried out according to the installa-
tion regulations.
In electroplating and CCP systems (cathodic corrosion protection) it
mustbetakenintoaccountthatsignificantpotentialdifferencesexist.
Note safety instructions
Take note of safety
instructions for Ex
applications
Select power supply
Select connection cable
Cable screening and
grounding