Connecting To Power Supply; Preparing The Connection - Vega VEGAWELL 52 Operating Instructions Manual

Safety instructions
Take note of safety
instructions for Ex
applications
Select voltage supply
Select installation cable
VEGAWELL 52 • 4 ... 20 mA/HART Pt 100
5

Connecting to power supply

5.1

Preparing the connection

Generally connect the instrument only in the complete absence of line
voltage.
The instrument is equipped with an integrated overvoltage protection.
For additional protection of the signal circuit, we recommend further
external overvoltage arresters.
•
Type B63-48 (use with VEGAWELL 52 with plastic housing) or
•
Type ÜSB 62-36G.X (use in a separate housing)
In hazardous areas you must take note of the respective 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 instru-
ment version.
The data for power supply are specified in chapter " Technical data".
Note:
Power the instrument via an energy-limited circuit (power max. 100 W)
acc. to IEC 61010-1, e.g.
•
Class 2 power supply unit (acc. to UL1310)
•
SELV power supply unit (safety extra-low voltage) with suitable
internal or external limitation of the output current
Keep in mind the following additional factors that influence the operat-
ing voltage:
•
Lower output voltage of the power supply unit under nominal load
(e.g. with a sensor current of 20.5 mA or 22 mA in case of fault
signal)
•
Influence of additional instruments in the circuit (see load values in
chapter " Technical data")
The instrument is connected with standard two-wire installation cable
without shielding. If electromagnetic interference is expected which is
above the test values of EN 61326 for industrial areas, shielded cable
should be used.
Make sure that the cable used has the required temperature resist-
ance and fire safety for max. occurring ambient temperature
Use cable with round cross-section. A cable outer diameter of
5 ... 9 mm (0.2 ... 0.35 in) ensures the seal effect of the cable gland.
If you are using cable with a different diameter or cross-section,
exchange the seal or use a suitable cable gland.
We generally recommend the use of shielded cable for HART
multidrop mode.
5 Connecting to power supply
15