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Chapter3. Safety
All connections of the RSTi-EP components are protected against voltage pulses and overcurrent in
accordance with IEC 61131-2, Zone B. The operator has to decide whether additional overvoltage
protection according to IEC 62305 is required. Voltages that exceed +/-30 V may cause the
destruction of Network Adapters and modules.
A feed-in power supply with secure isolation must be used.
2.1.4 Earthing (Functional Earth FE)
Each RSTi-EP I/O module is fitted with an FE spring on the underside which creates an electrical
connection to the DIN rail. In order to establish a secure connection, the assembly must be carried
out carefully in accordance with the instructions (refer to the Chapter, Error! Reference source not
found.). The module is earthed by connecting the DIN rail to the protective earth via the earth
terminal.
2.1.5 Shielding
Shielded lines are to be connected with shielded plugs and fixed on a shield bus in compliance with
the relevant standard (refer to the Chapter, E).
2.2 Intended Use
The products of the RSTi-EP series are intended for use in industrial automation. A RSTi-EP station
with bus Network Adapter and connected modules is intended for the decentralized control of
systems or sub-systems. Through the Network Adapter, every module of a station is integrated into a
fieldbus structure and connected to the control unit. The RSTi-EP products conform to protection
class IP 20 (in accordance with DIN EN 60529), they can be used in potentially explosive atmospheres
rated as Zone 2 (as per Directive 94/9/EC) and in safe zones.
The observance of the supplied documentation is part of the intended use. The products described in
this manual may only be used for the intended applications and only in connection with certified
third-party devices or components.
2.3 Use in a Potentially Explosive Atmosphere
If RSTi-EP products are used in potentially explosive atmospheres, the following notes are also
applicable:
•
Staff involved in assembly, installation and operation must be qualified to perform safe work
on electrical systems protected against potentially explosive atmospheres.
•
For applications in potentially explosive atmospheres, the requirements according to IEC/EN
60079-15 must be observed, in particular the housing enclosing the system must meet the
requirements of explosion protection type Ex n or Ex e and protection class IP54.
•
Sensors and actuators that are located in Zone 2 or in a safe zone can be connected to the
RSTi-EP station.
•
When the temperature under rated conditions exceeds 70 °C at the conductor or conduit
entry point, or 80 °C at the contact, the temperature specification of the selected cable shall
be in compliance with the actual measured temperature values.
•
When using relay modules EP-2814 in explosive atmosphere:
o Condensation shall be avoided.
o If the switching voltage exceeds 63V, a surge protection device shall be provided that
limits the transients to a peak voltage of 500V or less.
•
A visual inspection of the RSTi-EP station is to be performed once per year.
6
RSTi-EP Functional Safety Manual
GFK-2956A
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