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92 Electrical installation – North America
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EMC filter
The drive has an internal EMC filter as standard. In the UL (NEC) drive types, the filter
is disconnected by default. The filter is typically not necessary in North American
installations.
If you are concerned with EMC issues, and install the drive to a symmetrically grounded
TN-S system (center-grounded wye), you can connect the internal EMC filter. See
Disconnecting the ground-to-phase varistor, or connecting the EMC filter (page
Note: When the internal EMC filter is disconnected, the electromagnetic compatibility
of the drive is decreased.
WARNING!
Do not install a drive with the internal EMC filter connected to a grounding system
that the EMC filter is not compatible with (for example, an IT system). The supply
network becomes connected to ground potential through the internal EMC filter
capacitors, which can cause danger or damage to the drive.
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Ground-to-phase varistor
The drive has a ground-to-phase varistor circuit as standard. You can install a drive that
has the varistor circuit connected to a symmetrically grounded TN-S system
(center-grounded wye). For other systems, refer to
ground-to-phase varistor with the grounding system (page
the varistor circuit is disconnected at the factory.
WARNING!
Do not install the drive with the ground-to-phase varistor connected to a system
that the varistor is not suitable for. If you do, the varistor circuit can be damaged.
￭
Compatibility of EMC filter and ground-to-phase varistor with the
grounding system
WARNING!
If you do not obey these instructions, injury to personnel or damage to the drive
can occur.
A metal EMC screw is used to connect the internal EMC filter, and a metal VAR screw
is used to connect the ground-to-phase varistor. The screws are installed at the factory.
The material of the screws (plastic or metal) depends on the product variant. Before
Compatibility of EMC filter and
92). In some product variants,
94).
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