VEGA B61-300 FI - Manual (Page 12)

4 Connecting to power supply
4 .1 Preparing the connection
Always keep in mind the following safety instructions:
l Connect only in the complete absence of line voltage
Before starting setup make sure that the power supply corresponds to
the specifications on the type label.
For effective overvoltage protection, the cables between overvoltage
arrester and instrument should be as short as possible.
Danger:
Apart from the overvoltage arrester, a separate PE terminal is mounted
on the carrier rail in the aluminium housing. It is galvanically connected
with the carrier rail.
The ground conductor (PE) of the power supply cable must be led to
this PE terminal to reach protection ground for the aluminium housing.
The PE terminal on the overvoltage arrester must be free.
In hazardous areas you must take note of the respective regulations,
conformity and type approval certificates of the sensors and power
supply units.
4 .2 Connection steps for version with housing
Proceed as follows:
1 Loosen screws of the housing cover
2 Push the supply and connection cables through the cable gland
into the housing, strip approx. 1 cm (0.4 in) insulation from the
ends of the wires
3 Connect the wire ends L, N and PE according to chapter "Wiring
plan" to the terminals of the overvoltage arrester
4 With aluminium housing connect the wire end for PE to the green/
yellow PE terminal in the housing
5 Check all cable connections, especially the PE connection, to
make sure they are tightened sufficiently
6 Tighten the compression nuts of the cable glands. The seal ring
must completely encircle the cable
7 Tighten screws of the housing cover
The electrical connection is finished.
Note safety instructions
Take note of sa-
fety instructions
for Ex applica-
tions
12 Overvoltage arrester • B61-300 FI
4 Connecting to power supply
40489
-EN
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