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 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 166).
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
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 166), and Guidelines for installing the drive to a TT system (page 168).
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.
￭ When to connect EMC filter or disconnect ground-to-phase varistor:
TN-S, IT, corner-grounded delta and midpoint-grounded delta systems
Requirements for disconnecting EMC filter and varistor and additional requirements for
different electrical power systems are given below.
Note: Configure the EMC filter based on the electrical system of the installation site.
166 Electrical installation – North America
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