7.5 INSTALLATION IN A CORNER-GROUNDED NETWORKYou can use corner grounding with the enclosed drive sizes MR8-MR12 with a 380-480 Vmains and with a 208-240 V mains. In these conditions, you must change the EMC protectionlevel to C4. See the instructions in chapter 7.6 Installation in an IT system.7.6 INSTALLATION IN AN IT SYSTEMIf your mains is impedance-grounded (IT), the AC drive must have the EMC protection levelC4. If your drive has the EMC protection level C3, it is necessary to change it to C4. To do this,remove the EMC jumper.WARNING!Do not make changes in the AC drive when it is connected to mains. Thecomponents of the drive are live when the drive is connected to mains.CAUTION!Before you connect the AC drive to mains, make sure that the EMC level of the driveis correct. An incorrect EMC level can cause damage to the drive.7.6.1 THE EMC JUMPER IN MR8Change the EMC protection of the AC drive from level C3 to level C4.1 Open the cover of the AC drive.2 Find the EMC box. To get access to the EMCjumper, remove the cover of the EMC box.AA. The EMC jumper3 Remove the EMC jumper. Attach the cover of theEMC box again.COMMISSIONING AND ADDITIONAL INSTRUCTIONS VACON · 87LOCAL CONTACTS: HTTP://DRIVES.DANFOSS.COM/DANFOSS-DRIVES/LOCAL-CONTACTS/ 7
