Midpoint-grounded delta systems
You can connect the ground-to-phase varistor.
IT systems (ungrounded or high-resistance grounded [>30 ohms])
Do not connect the ground-to-phase varistor.
Connecting EMC filter – North America
This section is valid for the UL (NEC) drive types. The internal EMC filter of the drive
is disconnected as default. If you are concerned with EMC issues, and install the drive
to a symmetrically grounded TN-S system, corner-grounded delta or
mid-point-grounded delta system, you can connect the internal EMC filter. Contact
ABB for the connection instructions.
Connecting ground-to-phase varistor – North America
This section is valid the UL (NEC) drive types. The internal ground-to-phase varistor
of the drive is disconnected as default. If you install the drive to TN-S system,
corner-grounded delta or mid-point-grounded delta system, you can connect the
ground-to-phase varistor. Contact ABB for the connection instructions.
Connecting EMC filter and ground-to-phase varistor – North America 287
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