2 Safety Instructions
Rev. 08/2018 9
2.2 Electrostatic Discharge Hazards
Electronic equipment is sensitive to static electricity. To protect these components from damage
caused by static electricity, special precautions must be taken to minimize or prevent
electrostatic discharge.
Observe these safety precautions while you work with the equipment or in its vicinity.
– Before performing maintenance or repair work, ensure that the static electricity inherent to
your body is discharged.
– Do not wear clothing made from synthetic materials to prevent static electricity from
building up. Your clothing should therefore be made of cotton or cotton mix materials.
– Keep plastics such as vinyl and Styrofoam materials as far away from the control system, the
modules, and the work environment as possible.
– Do not remove the circuit boards from the housing of the device.
2.3 Information on Electric Isolation
If ground and earth potential are not properly isolated, the following problems as well as others
can occur:
– Electromagnetic interferences (e.g. ground loops)
– Signal corruption (e.g. of the analog voltage signal)
– Unwanted leakage currents
Therefore, earth potential and the negative pole of the power supply of all devices in the electric
assembly that provide the option, should be connected separately. If possible, the negative pole
of the power supply should only be connected to earth potential at one point in the entire
system.
Wiring Example
Device with
shielded wires
Device featuring
protection class II
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