Installation instructions 87
Checking the compatibility with IT (ungrounded), corner-
grounded delta, midpoint-grounded delta, and TT
systems
EMC filter (option +E202)
A drive with EMC filter +E202 (ARFI-10) 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 (option +E202) or ground-to-phase varistor: TN-S, IT,
corner-grounded delta, and midpoint-grounded delta system on page 88
• Guidelines for installing the drive to a TT system on page 88
• Disconnecting EMC filter and ground-to-phase varistor on page 90.
WARNING! Do not install the drive with EMC filter +E202 connected to a system
that the filter is not suitable for. This can cause danger, or damage the drive.
Note: When the EMC filter is disconnected, the drive EMC compatibility is considerably
reduced.
Ground-to-phase varistor
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 (option +E202) or ground-to-phase varistor: TN-S, IT,
corner-grounded delta, and midpoint-grounded delta system on page 88
• Guidelines for installing the drive to a TT system on page 88
• Disconnecting EMC filter and ground-to-phase varistor on page 90.
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.
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