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3.1.3 Earthing and earth fault protection
The AC drive must always be earthed with an earthing conductor connected to the earthing terminal
marked with:
The touch current of the AC drive exceeds 3.5 mA
AC
. According to EN61800-5-1, one or more of the
following conditions for the associated protective circuit shall be satisfied:
A fixed connection and
•the protective earthing conductor shall have a cross-sectional area of at least 10 mm
2
Cu
or 16 mm
2
Al, or
• an automatic disconnection of the supply in case of discontinuity of the protective earthing
conductor, or
• provision of an additional terminal for a second protective earthing conductor of the same
cross-sectional area as the original protective earthing conductor.
The cross-sectional area of every protective earthing conductor which does not form part of the
supply cable enclosure shall, in any case, be no less than:
•2.5 mm
2
if mechanical protection is provided or
•4 mm
2
if mechanical protection is not provided. For cord-connected equipment, provisions
shall be made so that the protective earthing conductor in the cord shall, in the case of
failure of the strain-relief mechanism, be the last conductor to be interrupted.
However, always follow the local regulations for the minimum size of the protective earthing con-
ductor.
NOTE! Due to the high capacitive currents present in the AC drive, fault current protective switches
may not function properly.
CAUTION!
Table 12. Protective earthing conductor cross-section
Cross-sectional area of phase conductors (
S
)
[mm
2
]
Minimum cross-sectional area of the corre-
sponding protective earthing conductor [mm
2
]
S
≤16
16<
S
≤35
35<
S
S
16
S
/2
The values above are valid only if the protective earthing conductor is made of the same metal as
the phase conductors. If this is not so, the cross-sectional area of the protective earthing
conductor shall be determined in a manner which produces a conductance equivalent to that
which results from the application of this table.
Do not perform any voltage withstand tests on any part of the AC drive. There is a
certain procedure according to which the test shall be performed. Ignoring this
procedure may result in a damaged product.
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