Chapter 2: Installation and Wiring
Page 2–15
DuRApulse GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
isolaTing main poWer from ground
WARNING: If the poWeR dIstRIbutIoN system supplyING the Gs4 dRIve Is sINGle phAse, the RfI
jumpeR must be Removed.
WARNING: If the poWeR dIstRIbutIoN system supplyING the Gs4 dRIve Is A floAtING-GRouNd system
(It) oR AN AsymmetRIc-GRouNd system (tN), the RfI jumpeR must be Removed.
If the power distribution system supplying the GS4 drive is a floating ground system (IT) or an
asymmetric ground system (TN), the RFI jumper must be removed. Removing the RFI jumper
disconnects the internal RFI filter capacitor between the drive’s frame and circuits to avoid
damaging those circuits and to reduce ground leakage current.
Important points regarding ground connection
•
To ensure the safety of personnel, proper operation, and to reduce electromagnetic radiation, the
GS4 drive must be properly grounded during installation�
•
The diameter of the cables must meet the size specified by applicable codes and regulations�
•
The grounding cable must be connected to the ground of the GS4 drive to meet safety
regulations�
•
The grounding cable can be used as the ground for equipment only when the aforementioned
points are met�
•
When installing multiple GS4 drives, do not connect the grounds of the AC motor drive in
series� Instead, utilize a single-point grounding scheme (as shown below), or provide individual
grounding rods for each GS4 drive�
Best wiring setup for ground wires
Pay particular attention to the following WARNINGS:
WARNING: do Not Remove the RfI jumpeR WhIle poWeR Is ApplIed to the Gs4 dRIve.
WARNING: cuttING the RfI shoRt-cIRcuIt cAble WIll Also cut off the coNductIvIty of the
cApAcItoR. GAp dIschARGe mAy occuR oNce the tRANsIeNt voltAGe exceeds 1000v.
WARNING: the RfI jumpeR mAy Not be Removed If the mAIN poWeR Is A GRouNded poWeR system.
WARNING: the RfI jumpeR mAy Not be Removed WhIle coNductING hIGh voltAGe tests.
WARNING: WheN coNductING A hIGh voltAGe test to the eNtIRe fAcIlIty, the mAIN poWeR ANd the
motoR must be dIscoNNected If leAkAGe cuRReNt Is too hIGh.
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