Page 2–16
DuRApulse GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
Chapter 2: Installation and Wiring
floaTing ground sysTem (iT sysTems)
A floating ground system is also called an IT system, an ungrounded system, or a high impedance/
resistance grounding system (greater than 30Ω).
cAutIoN: do Not INstAll AN exteRNAl RfI/emc fIlteR! the emc fIlteR WIll pAss thRouGh
the RfI cApAcItoR, thus coNNectING poWeR INput to GRouNd. thIs Is veRy dANGeRous ANd
cAN eAsIly dAmAGe the Gs4 dRIve.
asymmeTriC ground sysTem (Corner grounded Tn sysTems)
cAutIoN: do Not Remove the RfI jumpeR WhIle the INput teRmINAls of the Gs4 dRIve
cARRIes poWeR.
The RFI jumper must be removed in the following four situations. This is to prevent the system
from grounding through the RFI capacitor, damaging the GS4 drive.
RFI Jumper Must Be Removed (Asymmetric Ground / Corner Grounded TN Systems)
1) Grounding at a Corner of a Triangle Configuration 2) Grounding at a Midpoint in a Polygonal Configuration
3) Grounding at One End in a Single-Phase
Configuration
4) No Stable Neutral Grounding in a Three-Phase
Autotransformer Configuration
The RFI jumper should be left in place for a symmetrically grounded system.
RFI Jumper Left In Place (Symmetrical Ground System)
Internal grounding through internal RFI filter, which reduces
electromagnetic radiation.
In a situation with higher requirements for electromagnetic
compatibility, and using a symmetrical grounding power system,
an EMC filter can be installed.
As a reference, the diagram on the right is a
symmetrical grounding power system.
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