Safety 9
Grounding
These instructions are intended for all who are responsible for the grounding of the
inverter.
WARNING! Ignoring the following instructions can cause physical injury or death,
in c r e a s e d e l e c t r om a g n e t i c i n t e r f e r e n ce a n d e q u i p m e n t m a l fu nc t ion .
• Ground the inverter, motor and adjoining equipment to ensure personnel safety in all
circumstances, and to reduce electromagnetic emission and interference.
• Make sure that grounding conductors are adequately sized as required by safety
regulations.
• When shielded cables are used, make a 360° high frequency grounding of cable
entries at the cabinet lead-through to suppress electromagnetic disturbances. In
addition, connect the cable shields to protective earth (PE) to meet safety regulations.
Note:
• The power cable shields are suitable for equipment grounding conductors only when
adequately sized to meet safety regulations.
• Standard IEC/EN 62109, 5.2.5 requires that as the normal touch current of the inverter
is higher than 3.5 mA AC or 10 mA DC, you must use a fixed protective earth
connection.
• A four-conductor system is allowed for input cabling, but shielded symmetrical cable is
recommended. To operate as a protective conductor, the shield conductivity must be
as follows when the protective conductor is made of the same metal a the phase
conductors.
• Automatic disconnection of the supply must be provided in case of discontinuity of the
protective earthing conductor.
• A second protective earthing conductor of the same cross-sectional area as the
original protective earthing conductor must be provided.
Cross-sectional area of
the phase conductors
S (mm
2
)
Minimum cross-sectional area of the
corresponding protective conductor
S
p
(mm
2
)
S
16
S/2
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