Installation manual

44
Use on IT system and corner grounded system
IT system: Isolated or impedance grounded neutral
Use a permanent insulation monitor compatible with non-linear loads, such as a Merlin Gerin type XM200 or equivalent.
Corner grounded system: System with one phase connected to ground
Altivar 71 drives feature built-in RFI filters. When using ATV71H U22Y to D90Y drives on an IT system, the link between these filters and
ground must be removed as shown in the following diagrams. For other catalog numbers, removal of this link is possible but not mandatory:
Remove the jumper located to the left of the power terminals (two jumpers for ATV71pD22N4).
CAUTION
RISK OF DAMAGE TO THE DRIVE
On ATV71p075N4 to U40N4 ratings, if the filters are disconnected, the drive's switching frequency must not exceed 4 kHz.
Refer to the Programming Manual for the corresponding parameter setting.
Failure to follow this instruction can result in injury and/or equipment damage.
Normal
(filter connected)
IT system
(filter
disconnected)
ATV71pD22N4