Vacon NXP series, System Hardware Manual

Page: 14 / 83

vacon • 14 Safety
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2.3 Grounding and ground fault protection
The AC drive must always be grounded with a grounding conductor connected to the grounding ter-
minal 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 grounding 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 grounding
conductor
, or
• provision of an additional terminal for a second
protective grounding conductor
of the same
cross-sectional area as the original
protective grounding conductor
.
The cross-sectional area of every protective grounding 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 grounding 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 grounding
conductor.
NOTE!
Due to the high capacitive currents present in the AC drive, fault current protective switches
may not function properly.
CAUTION!
Table 5. Protective grounding conductor cross-section
Cross-sectional area of phase conductors (
S
)
[mm
2
]
Minimum cross-sectional area of the corre-
sponding
protective grounding conductor
[mm
2
]
S
≤16
16<
S
≤35
35<
S
S
16
S
/2
The values above are valid only if the protective grounding conductor is made of the same metal
as the phase conductors. If this is not so, the cross-sectional area of the protective grounding
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.
13006.emf
13006.emf