vacon 100 installation manual - VEM motors Finland Oy

vacon • 65Commissioning6.3 Installation in it systemIf your supply network is an IT (impedance-grounded) system but your AC drive is EMC-protectedaccording to class C2 you need to modify the EMC protection of the AC drive to EMClevelC4. This is done by removing the built-in EMC jumpers with a simple procedure describedbelow:Warning! Do not perform any modifications on the AC drive when it is connectedto mains.6.3.1 Frames MR4 to MR61Remove the main cover of the AC drive (see page 32) and locate the jumpers connectingthe built-in RFI-filters to ground. See Figure 56.MR4MR5MR6Figure 56. Locations of the EMC-jumpers in frames MR4 to MR62Disconnect the RFI-filters from ground by removing the EMC-jumpers usinglong-nose pliers or similar. See Figure 57.Figure 57. Removing the jumper, MR5 as example6Tel. +358 (0) 201 2121 • Fax +358 (0)201 212 205