Installation and Connections
32
ing. The filter is not required if power supplies with the CE symbol are used, e. g. the HIMA
standard power supplies.
– Correct and interference-free electrical installation in the ambient of the control, e. g. no
power current cables should run together with the 24 V cables.
– No filter H 7013 is necessary if the 24 V feeding is installed in an own power supply cabi-
net installed side by side to the cabinets with PLCs.
– Furthermore please notice the notes within the PES catalog concerning earthing, shielding
and cable run to sensors and actuators.
8.5 Earthing in the HIMA PES
Reliable earthing and thus the fulfillment of the valid EMC regulations in HIMA systems is
achieved by the measures described below.
8.5.1 Earthing Connections
All touchable plates of the 19-inches HIMA components (e. g. blind plates and subracks) are
electrically conductive passivated (ESD protection, ESD = Electrostatic Discharge). The safe
electrical connection between built-in components, such as subracks, and the cabinet is made
via captive nuts with claws. The claws penetrate the surface of the swing frame (1) and thus
guarantee a safe electrical contact. The screws and washers used are made of high-grade
steel to avoid electrical corrosion (2).
The parts of the cabinet framework (3) are welded together and therefore they make up an
electrically conductive constructional element. Swing frame, door, mounting rails and mounting
plates (if existing) are conductively connected to the cabinet framework via short earthing
straps with a cross section of 16 mm
2
or 25 mm
2
. The earthing straps are covered with a yel-
low/green identifying sheath (5).
The top plate is screwed to the cabinet framework via four lifting eyes. Side panels and rear
panel are conductively connected via earthing clamps (7) (see Figure 8) to the cabinet frame-
work as well as the bottom plate via screws
Figure 7: Earthing connections for subracks
As a standard, two M 2500 (4) bus bars are already installed in the cabinet and are connected
to the cabinet framework via 25 mm
2
earthing straps (5). Additionally, the bus bars (4) can be
used for potentials separated from the earth just by removing the earthing straps (e.g. for the
screens of field cables). For the connection of the customers earthing an M 8 screw bolt is pro-
vided at the cabinet framework (6).
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