Electrical Connections
5–2
1070 073 825-103 (02.04) GB
5.1
Protective Earth Conductor (PE) and Screening Information
DANGER
Dangerous conditions, functional failures and equipment damage to
the system may be caused by substandard potential equalization or
inadequate screening between individual components!
Potential equalization currents must 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 electrically conductive, on the mounting plate
inside the control cabinet. Both sides of the insulated installed PE rails must
be connected to the mounting plate with max. 20 cm long, adequately di-
mensioned copper straps.
Arrange 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
for the first time , ensure that the potential equalization between devices
which are to be connected is correct. Do not forget the interfaces which con-
nect 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 mecha-
nical, chemical or electrochemical influences. Connections must be
permanent and tight.
Summary of Contents for CPS21_3
Page 1: ...Antriebs und Steuerungstechnik CPS21_3 CPS21_4 Interface Conditions Industrial PC Edition 103 ...
Page 90: ...Display and Control Elements 7 18 1070 073 825 103 02 04 GB Notes ...
Page 100: ...Maintenance and Replacements 8 10 1070 073 825 103 02 04 GB Notes ...
Page 102: ...Spare Parts 9 2 1070 073 825 103 02 04 GB Notes ...
