VEGA VEGACAP 66 - two-wire - Manual (Page 15)

15
5 Connecting to power supply
VEGACAP 66 • - two-wire
30023-EN-130916
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.
Connect the operating voltage according to the following diagrams.
Take note of the general installation regulations. As a rule, connect
VEGACAP 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".
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 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.
In hazardous areas, only use approved cable connections for VE-
GACAP 66.
Take note of the corresponding installation regulations for Ex applica-
tions.
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
3. Remove approx. 10 cm (4 in) of the cable mantle, strip approx.
1 cm (0.4 in) of insulation from the ends of the individual wires
4. Insert the cable into the sensor through the cable entry
5. Lift the opening levers of the terminals with a screwdriver (see
following illustration)
Note safety instructions
Take note of safety
instructions for Ex
applications
Voltage supply
Connection cable
Connection cable
for Ex applications