Delta VFD9A0MS43ANSHA User Manual

Chapter 1 Introduction MS300 (High Speed Model)
1-6
Asymmetric Ground System (Corner Grounded TN Systems)
Caution: Do not remove the RFI jumper while the input terminal of the drive carries power.
In the following four situations, the RFI jumper must be removed. This is to prevent the system from
grounding through the RFI and filter capacitors, damaging the drive.
RFI jumper must be removed
1. Grounding at a corner in a triangle configuration
L2
L3
L
1
2. Grounding at a midpoint in a polygonal
configuration
L2
L3
L
1
3. Grounding at one end in a single-phase
configuration
L
1
N
4. No stable neutral grounding in a three-phase
autotransformer configuration
L
1
L2
L3
L1
L2
L3
RFI jumper can be used
Internal grounding through RFI capacitors, which reduce
electromagnetic radiation. In a symmetrically grounding
power system with higher EMC requirements, an EMC filter
can be installed. As a reference, the diagram on the right is
a symmetrical grounding power system.
L2
L3
L
1

Delta VFD9A0MS43ANSHA Specifications

General

Brand	Delta
Model	VFD9A0MS43ANSHA
Category	Controller
Language	English