14 EN – Main switch and EMC C1 filter options installation supplement
Note: When the internal EMC filter is disconnected, the EMC compatibility of the
drive is considerably reduced. See section EMC compatibility and motor cable
length in section Technical data in the Hardware manual of the drive.
• A drive with the ground-to-phase varistor connected can be installed to a
symmetrically grounded TN-S system. If you install the drive to another system,
check if you must disconnect the varistor. See section Checking the compatibility
with IT (ungrounded), corner-grounded delta, midpoint-grounded delta, and TT
systems in chapter Electrical installation – IEC or Electrical installation – North
America in the Hardware manual of the drive.
WARNING! Do not install a 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.
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