ON SAFETY 2
8017768/12AX/2019-05-31|SICK
Subject to change without notice
OPERATING INSTRUCTIONS | TIC
Damaging potential equalization currents due to different ground potentials
The profiling system has been designed and tested for electrical safety in accordance with
EN 60 950-1 (2006-04) and EN 60 950-1 / A11 (2009-03).
The profiling system is connected to the peripheral devices (voltage supply, PLC/host,
any other sensors, etc.) via shielded cables. The shield of each cable is connected to the
metal housing of the corresponding system components via the system plug.
If the peripheral devices have metal housings and if the cable shields are also connected
to these housings, it is assumed that all devices involved in the system have the same
ground potential.
This is achieved by fulfilling the following conditions, for example:
• Mounting the devices on conductive metal surfaces.
• Correctly earthing the devices and metal surfaces in the system.
• Low-impedance and current-carrying equipotential bonding between areas with
different ground potentials, if necessary.
If these conditions are not met, e.g., on devices in a widely distributed system spanning
several buildings, different ground potentials may cause potential equalization currents
to flow along the cable shields between the devices, thereby creating hazards.
Risk of injury and damage caused by potential equalization currents
Potential equalization currents between the profiling system and the peripheral devices
can have the following effects:
• Dangerous voltages on the metal housing, e.g., of the 2D LiDAR sensors
• Incorrect functioning of or irreparable damage to the devices
• Damage/irreparable damage to the cable shields due to heating and cable fires.
Commissioning/operation/maintenance
Risk resulting from incorrect commissioning and configuration!
Do not commission without testing by qualified personnel!
Before carrying out initial commissioning of the profiling system, you must have it checked
and approved by qualified safety personnel.
Avoid strong vibrations and jolts at the measurement site
Do not allow the system components of the profiling system to be exposed to excessive
vibrations or jolts as a result of construction work at the measurement site or within its
immediate vicinity (work involving compressors, road rollers/compactors, etc.).
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Switch off all components of the profiling system if strong vibrations are anticipated.
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