19R0-R4R5R6-R9ENDEESFRITRUSVZHSwitch off the power and open the coverSee figure B1 on page 89.2. Switch off the power from the drive.3. Remove the front cover: Loosen the retaining screw with a screwdriver (3a) andlift the cover from the bottom outwards (3b) and then up (3c).4. Attach the residual voltage warning sticker in the local language.Check the compatibility with IT (ungrounded) and corner-grounded TN systems EMC filterThe internal EMC filter is not suitable for use on an IT (ungrounded) system or on acorner-grounded TN system. Disconnect the EMC filter before connecting the drive tothe supply network. Check the table on page 20.WARNING! Do not install the drive with the internal EMC filter connected on anIT system (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.Do not install the drive with the internal EMC filter connected on a corner-groundedTN system, otherwise the drive will be damaged.Note: When the internal EMC filter is disconnected, the drive EMC compatibility isconsiderably reduced. Ground-to-phase varistorThe ground-to-phase varistor is not suitable for use on an IT (ungrounded) system.Disconnect the ground-to-phase varistor before connecting the drive to the supplynetwork. Check the table on page 20.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.