R-
R+
ohm
PE
1000 V DC,
> 1 Mohm
Grounding system compatibility check
The standard drive can be an be installed to a symmetrically grounded TN-S system.
For other systems, see sections EMC filter and Ground-to-phase varistors (VAR)
below.
￭
EMC filter
To connect the drive to symmetrically grounded TN-S systems, you should connect
the internal EMC filter if you are concerned with EMC issues. See section When to
connect EMC filter or disconnect ground-to-phase varistor: TN-S, IT,
corner-grounded delta and midpoint-grounded delta systems (page 177).
WARNING!
Do not install the drive with the EMC filter connected to a system that the
filter is not suitable for. This can cause danger, or damage the drive.
Note: When the internal EMC filter is disconnected, the drive EMC compatibility is
considerably reduced.
￭
Ground-to-phase varistors (VAR)
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,
you may need to disconnect the varistor. See When to connect EMC filter or
disconnect ground-to-phase varistor: TN-S, IT, corner-grounded delta and
midpoint-grounded delta systems (page 177), and Guidelines for installing the drive
to a TT system (page 178).
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.
176 Electrical installation – North America
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