4−2 Electric Drives
and Controls
Bosch Rexroth AG RhoMotion 1070072365 / 04
Electrical Connections
4.1 Protective Earth (PE) conductor & screening information
DANGER
Dangerous conditions, functional failures and equipment da-
mage on machine plant caused by substandard potential
equalization or screening properties between system compo-
nents!
Potential equalization currents may not flow across the scree-
ning of interface cables.
L The protective earthing conductors (earthing connections) of the system
must be arranged in a tightly meshed grid. All components, control cabi-
net 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 connected to the mounting plate with max. 20 cm long, adequa-
tely dimensioned copper bands.
Position the PE lines so that the length of the outgoing protective earth
conductor connections to the individual modules in the control cabinet
does not exceed 1 m.
L When specifying the PE wiring, ensure cross-sections that are suffi-
ciently dimensioned. 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 inter-
face signal lines via the shielded conductors. Therefore, prior to swit-
ching on the IPC for the first time, ensure correct potential equalization
between devices that are to be interconnected. Do not forget the interfa-
ces interconnecting devices at different locations (regardless of distance
or power supply).
DANGER
Dangerous shock currents due to poor PE connections!
The effectiveness of PE connections must not be impeded by
mechanical, chemical or electrochemical influences. Connec-
tions must be permanent and tight.
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