IndraControl L40 Installation and Maintenance 8-15
DOK-CONTRL-IC*L40*****-PR03-EN-P
Ground Connection
An optimum ground connection is required to keep possible interferences
away from the IndraControl L40 and the Rexroth Inline modules and to
discharge them to the ground.
The top-hat rail used for mounting the IndraControl L40 must be mounted
to a grounded metal carrier, e. g. the rear panel of the switch cabinet.
A functional earth ground is required to ensure optimum noise immunity.
The functional earth ground must be connected via a cable that should be
as short as possible or, better, via a grounding strip.
Recommended value: Length: Max. 1 m
Cross-section: 6 mm
2
Both the IndraControl L40 and the power and segment terminals are
provided with FE springs (metal clips) at their bottom side, which establish
an electric connection to the top-hat rail. To ensure a reliable ground
connection even in case of dirt or a damaged metal clip, the
IndraControl L40 must be additionally grounded via the FE terminal point,
using a conductor with a cross-section of at least 1.5 mm².
The FE functional earth ground is intended to discharge disturbances. It is
not provided as a protection against electric shock for persons.
Starting at the IndraControl L40, the FE (functional earth ground) voltage
jumper is routed through all connected Rexroth Inline modules. This
ensures that these modules are grounded once the ground connection of
the IndraControl L40, the supply terminals and the top-hat rail has been
properly established.
Potential equalization according to DIN VDE 0100 Part 540 must be
provided between the system parts and the voltage supply.
All components of the system must be connected to the PE protective
conductor system at the connectors that are marked accordingly.
Shielding
The shielding is intended to reduce any effects of interferences on the
system.
Both the PROFIBUS line and the connection lines to modules for analog
signals must be shielded.
Observe the following when shielding:
• Fit the shield over an area as large as possible under the clip in the
shield connector.
• Ensure proper contact between the connector and the module.
• Avoid damaging or squeezing of cores. Avoid stripping the lines too
much.
• Connect the cores properly.
Shielding the PROFIBUS Line
The 0 V reference voltage of the connected loads must be returned to the
0 V terminal of the IndraControl L40, i. e. a two-pin connection must be
ensured. Otherwise, there will be no reliable protection from GND
breakage.
The cable parameters are described in the chapter entitled "Interfaces" on
page 7-12.
The line shield must be applied in the bus connector. In case of
installation in the switch cabinet, the line shield of the connected
PROFIBUS line must be connected to a shield bus using cable clips, if
possible directly behind the cable bushing. This requires the appropriate
shield terminal.
Functional Earth Ground
Voltage Jumper
Potential Equalization
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