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Electrical connection
6.5 Connecting equipotential-bonding conductors
I/O connection
• Create a low-impedance ground connection for additional cabinets, system components,
and distributed devices with the largest possible cross-section (at least 16 mm²).
• Ground unused lines at one end in the cabinet.
• Choose the greatest possible clearance between the power and signal cables (at least 20 cm).
The greater the distance over which the cables are routed in parallel, the greater the
clearance must be. You must install additional shields if sufficient clearance cannot be
maintained.
• Avoid unnecessarily long cable loops.
• Surge suppressors – e.g. RC elements or varistors – must be connected to the solenoids of
contactors and relays in the device.
• In order to reduce noise/interference entering or exiting via the cable, filter auxiliary voltages
in the control cabinet.
6.4
Potential concept
A noise-free connection between the internal and external supply voltage can be achieved by
connecting the 0 V potentials to each other and grounding them. This also eliminates the need
for the control circuit insulation monitor required by DIN EN 60204-1.
Figure 6-3
6.5
Connecting equipotential-bonding conductors
All cabinets belonging to the system are connected by signal cables. Also connect the cabinets
using equipotential-bonding conductors; according to the following diagram, for example:
Figure 6-4
88
Potential concept
Equipotential bonding conductor
3rd Party LCI Control Upgrade
Operating Instructions, 02/2022, A5E31872818
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