WARNING! Do not install the drive with ground-to-phase varistor connected
to a system that the varistor is not suitable for. If you do, the varistor circuit
can be damaged.
Grounding system compatibility check – North America
This section is valid for the UL (NEC) drive types.
Default wires – North AmericaFrame
VAREMC
Not connectedNot connectedR10, R11
￭ EMC filter compatibility
The drive has an internal EMC filter (+E210) as standard. However, for the UL (NEC)
drive types, the filter is disconnected as 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, IT system, corner-grounded delta or
mid-point-grounded delta system, you can connect the internal EMC filter. See section
Connecting EMC filter – North America (page 287).
Note: When the internal EMC filter is disconnected, the electromagnetic compatibility
of the drive is reduced.
￭ Ground-to-phase varistor compatibility
The drive is equipped with an internal ground-to-phase varistor as standard. However,
for the UL (NEC) drive types, the ground-to-phase varistor is disconnected as default.
For connecting the ground-to-phase varistor, see section Connecting EMC filter and
ground-to-phase varistor – North America (page 285).
104 Electrical installation
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