Connect To Power Supply; Prepare The Connection - Vega VEGADIF 65 Operating Instructions Manual

5 Connect to power supply

Safety instructions
Power supply
Connection cable
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5 Connect to power supply

5.1 Prepare the connection

Always keep in mind the following safety instructions:
Connect only in the complete absence of line voltage
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If overvoltage surges are expected, overvoltage arresters should
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be installed
Tip:
We recommend using VEGA overvoltage arresters B63-48 and
ÜSB 62-36G.X.
In hazardous areas you should take note of the appropriate regulations,
conformity and type approval certificates of the sensors and power
supply units.
Power supply and current signal are carried on the same two-wire
cable. The voltage supply range can differ depending on the
instrument version.
The data for power supply are specified in chapter "Technical data".
Provide a reliable separation between the supply circuit and the mains
circuits according to DIN VDE 0106 part 101. The VEGA power supply
units VEGATRENN 149A Ex, VEGASTAB 690 as well as all
VEGAMETs and VEGASCANs meet this requirement.
Information:
The signal conditioning instruments VEGAMET 624 and 625 as well as
VEGASCAN 693 have a digital sensor recognition. When connecting
VEGADIF 65, a software version from 1.92 is required with the signal
conditioning instrument. For software update move under "www.vega.
com/downloads" to "Software".
Keep in mind the following additional influences on the operating
voltage:
Output voltage of the power supply unit can be lower under
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nominal load (with a sensor current of 20.5 mA or 22 mA in case of
fault message)
Influence of additional instruments in the circuit (see load values in
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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.
VEGADIF 65 • 4 ... 20 mA/HART