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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
groundorpotentialequalization.
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
thespecicationsonthetypelabel.
Inhazardousareasyoumusttakenoteoftherespectiveregulations,
conformityandtypeapprovalcerticatesofthesensorsandpower
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,stripothewireendsapprox.1cm(0.4in)
Note:
Toensureaneectiveovervoltageprotection,theconnectioncables
should be as short as possible. Unnecessary cable should not be
woundupandplacedinsidethesensorhousing.Thiscouldinuence
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