Commissioning
vacon • 59
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
6
6.2
Changing EMC protection class
If your supply network is an IT (impedance-grounded) system but your AC drive is EMC-protected
according to class C1 or C2 you need to modify the EMC protection of the AC drive to EMC-level T
(C4). This is done by removing the EMC screws as described below:
Figure 39. Locations of EMC screws in MM4.
Figure 40. Locations of EMC screws in MM5.
Warning! Do not perform any modifications on the AC drive when it is connected to
mains.
Do not remove the EMC screws in the solar pump application. IT (impedance-
grounded) AC supply network is not allowed in the solar pump application.
1
Separate the powerhead and the terminal box. Turn the powerhead upside down and
remove the two screws marked in Figure 39 (for MM4), Figure 40 (for MM5) and in
Figure 42(for MM6).
