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 (page 132)
below.
￭
EMC filter
A drive with EMC filter 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 EMC filter. See sections When to disconnect EMC filter or ground-to-phase
varistor: TN-S, IT, corner-grounded delta and midpoint-grounded delta
systems (page 132), and Guidelines for installing the drive to a TT system (page 134).
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. See EMC compatibility and motor cable length (page 347).
￭
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 sections When to disconnect EMC
filter or ground-to-phase varistor: TN-S, IT, corner-grounded delta and
midpoint-grounded delta systems (page 132), and Guidelines for installing the drive
to a TT system (page 134).
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 disconnect EMC filter or 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.
132 Electrical installation – Global (IEC)
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