1. Residual current device has been installed in the supply system.
2. These wires have been disconnected. Otherwise ground-to-phase varistor capacitor
leakage current will cause the residual current device to trip.
Ground-to-phase varistor wireTT system
VAR
Note:
• Because the varistor wire has been disconnected, ABB does not guarantee the EMC
category.
• 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.
Source document on TT system: 3AXD10000681917
￭ Disconnecting instructions
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).
Connecting the power cables
WARNING!
Obey the safety instructions of the drive. If you ignore them, injury or death,
or damage to the equipment can occur.
Electrical installation 99
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