Electrical installation 93Checking the compatibility with IT (ungrounded) andcorner-grounded TN systemsWARNING! Do not install the drive with EMC filter +E200 or +E202 on an ITsystem (an ungrounded power system or a high-resistance-grounded [over30 ohms] power system), otherwise the system will be connected to ground potentialthrough the EMC filter capacitors of the drive. This can cause danger, or damage thedrive.WARNING! Do not install the drive with the ground-to-phase varistorconnected on an IT system (an ungrounded power system or a high-resistance-grounded [over 30 ohms] power system), otherwise the varistor circuit canbe damaged. EMC filterDrive EMC filters +E200 and +E202 are not suitable for use in an IT (ungrounded)system. Disconnect the filter before you connect the drive to the supply network. Forinstructions, see EMC filter and ground-to-phase varistor disconnecting instructionsfor ACS880-01 drives (3AUA0000125152 [English]). Ground-to-phase varistorThe ground-to-phase varistor of the drive is not suitable for use on an IT(ungrounded) system. Disconnect the varistor before you connect the drive to thesupply network. For instructions, see EMC filter and ground-to-phase varistordisconnecting instructions for ACS880-01 drives (3AUA0000125152 [English]). 690 V drivesDo not install 690 V drives on corner-grounded TN systems or corner-grounded ITsystems.
