VEGA B63-32 - Manual (Page 9)

9
5 Connecting to power supply
Overvoltage arresters • B63-48, B63-32
33012-EN-130228
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
Danger:
The stainless steel housing of B63-48, B63-32 has no electrical
function and therefore provides no internal or external connection to
ground or potential equalization.
The plant operator is responsible for ensuring an adequate connec-
tion, for example within the context of protective grounding, depend-
ing on the installation and protection rating.
The B63-48, B63-32 exhibit a voltage resistance of 0.5 kV for one
minute in the signal circuit with respect to the stainless steel housing,
but not with respect to the green/yellow cable in the sensor circuit.
This must be taken into account for the electrical installation.
Before starting setup make sure that the power supply corresponds to
the specifications on the type label.
In hazardous areas you must take note of the respective regulations,
conformity and type approval certificates of the sensors and power
supply units.
5.2 Connection procedure
Proceed as follows:
1. Unscrew housing cover of the sensor
2. If a display and adjustment module is present, remove it accord-
ing to the operating instructions of the sensor
3. Unscrew the cable gland
4. Push the connection cables through the cable gland into the sen-
sor
5. Screw B63-48, B63-32 into the opening of the cable gland ac-
cording to the description under "Mounting instructions"
6. Shorten the connection cables of B63-48, B63-32 to the suitable
length, strip off the wire ends approx. 1 cm (0.4 in)
Note:
To ensure an effective overvoltage protection, the connection cables
should be as short as possible. Unnecessary cable should not be
wound up and placed inside the sensor housing. This could influence
the protective function of B63-48, B63-32.
7. Connect wire ends red and black according to chapter "Wiring
plan" and operating instructions of the respective sensor
8. Connect wire end green/yellow to the internal ground terminal in
the sensor housing, connect external ground terminal to potential
equalisation
9. Pull out terminal block inside B63-48, B63-32 with pliers
Note safety instructions
Take note of safety
instructions for Ex
applications