￭ Disconnecting the EMC filter or ground-to-phase varistor
Before you continue, refer to Compatibility of EMC filter and ground-to-phase varistor
with the grounding system (page 68).
• To disconnect the EMC filter, remove the metal EMC screw.
• To disconnect the ground-to-phase varistor, remove the metal VAR screw.
EMC/VAR screw location
￭ Guidelines for installing the drive to a TT system
You can install the drive to a TT system under these conditions:
1. There is a residual current device in the supply system
2. The internal EMC filter is disconnected. If the EMC filter is not disconnected, its
leakage current will cause the residual current device to trip.
Note:
• ABB does not guarantee the EMC performance, because the internal EMC filter is
disconnected.
• ABB does not guarantee the functioning of the ground leakage detector built inside
the drive.
• In large systems the residual current device can trip without a real reason.
￭ Identifying the grounding system of the electrical power network
WARNING!
Only a qualified electrical professional may do the work instructed in this section.
Depending on the installation site, the work may even be categorized as live
70 Electrical installation – IEC
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