Connecting To Power Supply; Preparing The Connection - Siemens SITRANS TCSC Operating Instructions Manual

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Safety instructions
Safety instructions
for Ex applications
Voltage supply
Connection cable
Cable screening and
grounding
Connection cable
for Ex applications
MAN-100414
5

Connecting to power supply

5.1

Preparing the connection

Always keep in mind the following safety instructions:
Warning:
Connect only in the complete absence of line voltage.
Connect only in the complete absence of line voltage
If overvoltage surges are expected, overvoltage arresters should
be installed
Note:
Install a separating facility for the instrument which is easy to access.
The separating facility must be marked for the instrument (IEC/
EN 61010).
In hazardous areas you must take note of the respective regulations,
conformity and type approval certificates of the sensors and power
supply units.
The nominal range of the voltage supply can be 24 ... 230 V AC,
50/60 Hz or 24 ... 65 V DC.
Detailed information about the power supply can be found in chapter
"Technical data".
The voltage supply of SITRANS TCSC is connected with standard
cable according to the national installation standards.
The sensors are 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.
Make sure that the cable used has the required temperature resist-
ance and fire safety for max. occurring ambient temperature
Connect the cable screen on both ends to ground potential. In the
sensor, the screen must be connected directly to the internal ground
terminal. The ground terminal on the outside of the sensor housing
must be connected to the potential equalisation (low impedance).
If potential equalisation currents are expected, the connection on the
processing side must be made via a ceramic capacitor (e. g. 1 nF,
1500 V). The low-frequency potential equalisation currents are thus
suppressed, but the protective effect against high frequency interfer-
ence signals remains.
Take note of the corresponding installation regulations for Ex applica-
tions. In particular, make sure that no potential equalisation currents
flow over the cable screen. In case of grounding on both sides this
can be achieved by the use of a capacitor or a separate potential
equalisation.
SITRANS TCSC - Operating Instructions
11

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