Grounding - ABB ACS355 Manual



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,
increased electromagnetic interference and equipment malfunction.
•
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.
Cross-sectional area of
the phase conductors
2
S (mm )
≤
S 16
≤ ≤
16 S 35
<
35 S
•
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.
Minimum cross-sectional area of the
corresponding protective conductor
2
S (mm )
p
S
16
S/2
Safety 9