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Chapter2: Safety
2.1.3 Fusing
The operator must set up the equipment so that it is protected against overloading. The upstream
fuse must be designed such that it does not exceed the maximum load current. The maximum
permissible load current of the RSTi-EP components can be found in the technical data.
In the case of modules without fused sensor/actuator power supplies, all lines to the connected
sensors/actuators must be fused corresponding to their conductor cross-section (as per DIN VDE
0298 Part 4).
To meet UL-specifications in accordance with UL 248-14, a UL-certified automatic fuse or a 10 A fuse
with a medium time-lag must be used.
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 Chapter 6, Installation). The module is
earthed by connecting the DIN rail to the protective earth via the earth terminal.
Modules EP-700F, EP-1214, EP-2214, EP-3124 and EP-3164 have connections with green pushers. An
FE potential is also provided at these connections. They must not be used as a PE.
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 Chapter 7, Earthing and Shielding).
2.1.6 Overcurrent
Potentials of network adapters and power-feed modules must be disconnected either simultaneously
or in the order 24 V supply first, then the GND potential.
2.2 Intended Use
The products of the RSTi-EP series are intended for use in industrial automation. A RSTi-EP station
with network adapter and connected modules is intended for the decentralized control of systems or
sub-systems. Via the network adapter every module of a station is integrated into a fieldbus
structure and connected to the primary 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
2014/34/EU
) 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.
GFK-2958E
RSTi-EP User Manual
21
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