18 Safety instructions
Grounding
These instructions are for all personnel who are responsible for the grounding of the drive.
WARNING! Obey these instructions. If you ignore them, injury or death and
equipment malfunction can occur, and electromagnetic interference can increase.
• If you are not a qualified electrician, do not do grounding work.
• Always ground the drive, the motor and adjoining equipment. This is necessary for the
personnel safety. Proper grounding also reduces electromagnetic emission and
interference.
• Make sure that the conductivity of the grounding conductors is sufficient. See section
Selecting the power cables on page 53. Obey the local regulations.
• Connect the power cable shields to protective earth (PE) of the drive to make sure of
personnel safety.
• Make a 360° grounding of the power and control cable shields at the cable entries to
suppress electromagnetic disturbances.
• In a multiple-drive installation, connect each drive separately to the protective earth
(PE) busbar of the switch board or the transformer.
Note:
• You can use power cable shields as grounding conductors only when their conductivity
is sufficient.
• As the normal touch current of the drive is higher than 3.5 mA AC or 10 mA DC, you
must use a fixed protective earth connection. See standard EN 61800-5-1, 4.3.5.5.2.
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