VEGA VEGASWING 66 - transistor (NPN-PNP) With SIL qualification - Manual (Page 17)

17
5 Connecting to power supply
VEGASWING 66 • - transistor (NPN/PNP)
44951-EN-130805
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
In hazardous areas you must take note of the respective regulations,
conformity and type approval certificates of the sensors and power
supply units.
Only use metal housings (aluminium, stainless steel). The plastic
housing is not permitted.
Connect the operating voltage according to the following diagrams.
Take note of the general installation regulations. As a rule, connect
VEGASWING 66 to vessel ground (PA), or in case of plastic vessels,
to the next ground potential. On the side of the instrument housing
there is a ground terminal between the cable entries. This connection
serves to drain off electrostatic charges. In Ex applications, the instal-
lation regulations for hazardous areas must be given priority.
The data for power supply are specified in chapter "Technical data".
Use two-wire, screened cable. Connect the cable screen on both
ends to ground potential. In the sensor, the screen must be connected
directly to the internal ground terminal. The ground terminal on the
outside of the housing must be connected to the potential equalisa-
tion (low impedance).
Use cable with round cross section for instruments with housing and
cable gland. To ensure the seal effect of the cable gland (IP protection
rating), find out which cable outer diameter the cable gland is suitable
for.
•
5 … 9 mm (0.20 … 0.35 in)
•
6 … 12 mm (0.24 … 0.47 in)
•
10 … 14 mm (0.40 … 0.55 in)
Use a cable gland fitting the cable diameter.
In hazardous areas, only use approved cable connections for VEGAS-
WING 66.
Take note of the corresponding installation regulations for Ex applica-
tions.
Cover all housing openings conforming to standard according to
EN 60079-1.
5.2 Connection procedure
With Ex instruments, the housing cover may only be opened if there is
no explosive atmosphere present.
Proceed as follows:
1. Unscrew the housing cover
2. Loosen compression nut of the cable entry
Note safety instructions
Take note of safety
instructions for Ex
applications
Voltage supply
Connection cable
Connection cable
for Ex applications