User Manual Section 2
GFK-2958L May 2021
Safety 19
2.1.2 Open Equipment
RSTi-EP products are open equipment (having live electrical parts that may be accessible to
users) that may only be installed and operated in lockable housings, cabinets or electrical
operations rooms. Only trained and authorized personnel may access the equipment.
For applications requiring functional safety or in order to maintain compliance with the
ATEX Directive [Class 1, Zone 2 area (Category 3)], the surrounding housing must meet at
least IP 54.
The standards and guidelines applicable for the assembly of switch cabinets and the
arrangement of data and supply lines must be complied with.
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 must 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 Section 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.
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