18 Safety instructions
WARNING! Use a grounding wrist band when you handle the printed circuit
boards. Do not touch the boards unnecessarily. The boards contain
components sensitive to electrostatic discharge.
Grounding
These instructions are for all personnel who are responsible for the electrical
installation, including the grounding of the drive.
WARNING! Obey these instructions. If you ignore them, injury or death, or
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 to the protective
earth (PE) bus of the power supply. This is necessary for the personnel safety.
Proper grounding also reduces electromagnetic emission and interference.
• In a multiple-drive installation, connect each drive separately to the protective
earth (PE) bus of the power supply.
• Make sure that the conductivity of the protective earth (PE) conductors is
sufficient. See section Selecting the power cables on page 72. Obey the local
regulations.
• Connect the power cable shields to the protective earth (PE) terminals of the
drive.
• Make a 360° grounding of the power and control cable shields at the cable entries
to suppress electromagnetic disturbances.
Note:
• You can use power cable shields as grounding conductors only when their
conductivity is sufficient.
• Standard IEC/EN 61800-5-1 (section 4.3.5.5.2.) requires that 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 (PE) connection. In addition,
• install a second protective earth conductor of the same cross-sectional area
as the original protective earthing conductor,
or
• install a protective earth conductor with a cross-section of at least 10 mm
2
Cu
or 16 mm
2
Al,
or
• install a device which automatically disconnects the supply if the protective
earth conductor breaks.
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