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5
5.2
Changing EMC protection class
If your supply network is an IT (impedance-grounded) system but your AC drive is EMC-protected accord-
ing to class C2 you need to modify the EMC protection of the AC drive to EMC-level T. This is done by
removing the built-in EMC jumpers with a simple procedure described below:
5.2.1
Frames MR4 to MR7
Figure 41. Locations of the EMC-jumpers in frames MR4 to MR7
Figure 42. Removing the jumper, MR5 as example
Warning! Do not perform any modifications on the drive when it is con-
nected to mains.
1
Remove the main cover (frames MR4 to MR7) and the cable cover (frame MR7)
of the AC drive (see pages 25 and 26) and locate the jumpers connecting the
built-in RFI-filters to ground. See Figure 41.
2
Disconnect the RFI-filters from ground by
removing
the EMC-jumpers using
long-nose pliers or similar. See Figure 42.
MR4
MR6
MR5
Содержание SmartVFD HVAC MR4
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