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.
￭
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 Compatibility of EMC filter and
ground-to-phase varistor with the grounding system (page 94). In some product
variants, 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. It can cause damage to the
varistor circuit.
￭
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
94 Electrical installation – North America
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