Vega ATEX User Manual

15
5 Connecting to power supply
VEGAMET 841 • 4 … 20 mA
58864-EN-200401
5 Connecting to power supply
5.1 Preparing the connection
Always keep in mind the following safety instructions:
•
The electrical connection must only be carried out by trained,
qualiedpersonnelauthorisedbytheplantoperator.
•
If overvoltage surges are expected, overvoltage arresters should
be installed.
Warning:
Only connect or disconnect in de-energized state.
Thedataforpowersupplyarespeciedinchapter"Technical data".
The instrument belongs to protection class I, hence connection of an
earth conductor is required.
Use cable with round cross section. The cable diameter must be
suitableforthecableglandusedtoensurethesealeectofthecable
gland (IP protection).
The voltage supply is connected with standard cable according to the
national installation standards.
Standard two-wire cable can be used to connect the sensors.
Note:
If the temperatures are too high, the cable insulation can be dam-
aged. Hence keep apart from the ambient temperature also the self-
heating of the instrument for the temperature resistance of the cable
in the connection compartment in mind
1)
.
Warning:
Indeliverystatus,allopeningsarettedwithdustprotectioncaps.
These caps are only for protection during transport and are not suit-
able for protection during operation! Instead, all openings must be
closed with cable glands/blind plugs.
Cable glands, NPT adapters or blind plugs that are not included in
the scope of delivery must meet the applicable requirements in order
to ensure the environmental compatibility of the housing. For outdoor
applications, the weather resistance of the accessories to be used
must be taken into account. The cable glands, NPT adapters and
blind plugs must have a metric thread M20 to be compatible with the
threaded openings of the metal plate in the housing.
5.2 Sensor input mode active/passive
Through the selection of the terminals, you can choose between ac-
tive and passive operation of the sensor input.
•
In active mode, the controller provides the power for the con-
nected sensors. Power and measurement data are transmitted
Safety instructions
Voltage supply
Connection cable
Cable glands
1)
 Withanambienttemperature≥50°C(122°F)theconnectioncableshould
besuitableforanambienttemperaturewhichisatleast20°C(36°F)higher.

Vega ATEX Specifications

General

Brand	Vega
Model	ATEX
Category	Controller
Language	English