VEGA VEGACAP 64 - Relay (DPDT) - Manual (Page 13)

13
5 Connecting to power supply
VEGACAP 64 • - Relay (DPDT)
30012-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
Connect mains voltage according to the connection diagrams. Take
note of the general installation regulations. The electronics module
with relay output is designed in protection class I. To maintain this
protection class, it is absolutely necessary that the ground conductor
be connected to the internal ground conductor terminal. Take note of
the corresponding installation regulations for Ex applications.
The data for power supply are specified in chapter "Technical data".
The instrument is connected with standard three-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.
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)
6. Insert the wire ends into the open terminals according to the wir-
ing plan
7. Press down the opening levers of the terminals, you will hear the
terminal spring closing
8. Check the hold of the wires in the terminals by lightly pulling on
them
9. Tighten the compression nut of the cable entry. The seal ring must
completely encircle the cable
10. If necessary, carry out a fresh adjustment
11. Screw the housing cover back on
The electrical connection is hence finished.
Note safety instructions
Voltage supply
Connection cable