￭ Guidelines for installing the drive to a TT system
The drive can be connected on a TT system under these conditions:
1. Residual current device has been installed in the supply system.
2. These wires and ARFI-10 have been disconnected. Otherwise EMC filter and
ground-to-phase varistor capacitor leakage current will cause the residual current device
to trip.
Ground-to-phase varistor wireEMC filter (+E202) wiresTT system
VAREMC AC, ARFI-10
Note:
• ABB does not guarantee the functioning of the ground leakage detector built inside the
drive.
• Because the EMC filter has been disconnected, ABB does not guarantee the EMC
category C2.
• In large systems the residual current device can trip without a real reason.
￭ Disconnecting EMC filter and ground-to-phase varistor
EMC AC and varistor (VAR) grounding wires are located at the top of the circuit board
compartment. Disconnect them (1) and attach them with the nearby plastic clamp (2).
Remove the ARFI-10 filter from the cabinet.
Electrical installation 97
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