Electrical Connections
5–2
1070 073 822-104 (02.06) GB
5.1 Protective Earth conductor (PE) & screening information
DANGER
Dangerous conditions, functional failures and equipment damage
on machine plant caused by substandard potential equalization or
screening properties between system components!
Potential equalization currents may not flow across the screening of
interface cables.
L The protective earthing conductors (earthing connections) of the system
must be arranged in a tightly meshed grid. All components, control cabinet
housings and doors, including the mounting plate, must be earthed.
L The potential equalization lines / PE lines of all system components shall be
kept as short as possible, thus providing low-resistance connections.
L Install the PE lines, preferably electroconductively, on the mounting plate in
the control cabinet. Both sides of the insulated installed PE rails must be con-
nected to the mounting plate with max. 20 cm long, adequately dimensioned
copper bands.
Position the PE lines so that the length of the outgoing protective earth con-
ductor connections to the individual modules in the control cabinet does not
exceed 1 m.
L When specifying the PE wiring, ensure sufficiently dimensioned cross-sec-
tion. In this regard, also observe EN 60204, Part 1 (max. electrical resistance
and testing PE wiring installations).
L If at all possible, apply screening connections on both ends of a cable.
L Ensure that equipotential equalization currents do not flow across the inter-
face signal lines via the shielded conductors. Therefore, before switching on
the IPC for the first time , ensure that the potential equalization between de-
vices which are to be connected is correct. Do not forget the interfaces which
connect devices to each other at different locations (irrespective of distance
or power supply).
DANGER
Dangerous shock currents due to poor PE connections!
The effectiveness of PE connections must not be impeded by mech-
anical, chemical or electrochemical influences.
Connections must be permanent and tight.
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