4
Grounding
These instructions are intended for all who are responsible for the grounding of the thyristor power controller.
Incorrect grounding can cause physical injury, death and/or equipment malfunction and increase
electromagnetic interference.
Ground the thyristor power controller, the connected equipment and adjoining devices to
ensure personnel safety in all circumstances, and to reduce electromagnetic emission and
pick-up.
Make sure that grounding conductors are adequately sized and marked as required by safety
regulations.
In a multiple thyristor power controller installation, connect each thyristor power controller
separately to protective earth (PE).
Minimize EMC emission and make a 360° high frequency grounding (e.g. conductive
sleeves) of screened cable entries at the cabinet lead-through plate.
s:
Power cable shields are suitable as equipment grounding conductors only when adequately
sized to meet safety regulations.
As the normal leakage current of the thyristor power controller is higher than 3.5 mA
AC
or
10 mA
DC
(stated by EN 50178, 5.2.11.1), a fixed protective earth connection is required.
Printed circuit boards
These instructions are intended for all who handle the circuit boards. Ignoring the following instructions can
cause damage to the equipment.
WARNING!
The printed circuit boards contain compo
nents sensitive to electrostatic discharge. Wear a
grounding wristband when handling the boards. Touch the boards only when necessary.
ABB order no.: 3ADV050035P0001
Safety Instructions
3ADW000449R0101 DCT880 Service Manual e a
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