Chapter 7—EMC Installation
DG1 Series VFD MN040002EN—March 2014 www.eaton.com 43
Installation in Corner-Grounded Network
Corner grounding is allowed for all the drive types.
In these circumstances the EMC protection class must be
changed to level C4 following the instructions below.
Installation in IT System
If your supply network is an IT (impedance-grounded) system
but your AC drive is EMC-protected according to class C2
you need to modify the EMC protection of the AC drive to
EMC level C4. This is done by removing the built-in EMC
Screw with a simple procedure described below:
WARNING
Do not perform any modifications on the AC drive when
it is connected to mains.
WARNING
Electric shock hazard—risk of injuries! Carry out wiring
work only if the unit is de-energized.
After disconnecting the supply, wait at least five minutes
before removing the cover to allow the intermediate
circuit capacitors to discharge.
WARNING
Failure to follow these instructions will result in death or
serious injury.
Frame 1 to Frame 5
Remove the main cover of the AC drive (see Figure 30) and
locate the screw jumper connecting the built-in RFI-filters to
ground. Remove the screw jumper to disconnect the EMC
protection. Once the screw is removed, it can be
reconnected to re-engage the EMC protection.
Figure 29. Locations of the EMC Screw in
Frame 1, Frame 2, Frame 3 and Frame 4
Figure 30. Locations of the EMC Screws in Frame 5
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