Delta VP3000 Series - Page 143

Chapter 3 Electrical Wiring｜VP3000
134
Asymmetric Ground System (Corner Grounded TN Systems)
Caution: Do not remove the RFI jumper while power to the input terminal of the drive is ON.
In the following four situations, you must remove the RFI jumper. This is to prevent the system from
grounding through the RFI and filter capacitors and damaging the drive.
You must remove the RFI jumper for an asymmetric ground system
1. Grounding at a corner in a triangle configuration
L2
L3
L1
Figure 3-100
Grounding at a midpoint in a polygonal configuration
L2
L3
L1
Figure 3-101
Grounding at one end in a single-phase
configuration
L1
N
Figure 3-102
4. No stable neutral grounding in a three-phase
autotransformer configuration
L1
L2
L3
L1
L2
L3
Figure 3-103
You can use the RFI jumper for a symmetrical grounding power system
An internal ground is formed through a ground capacitor,
which reduces electromagnetic radiation. The requirements
for electromagnetic compatibility are more stringent. In the
application of power system using symmetrical grounding,
you can install an EMC filter. Refer to the figure on the right
for the symmetrical grounding power system.
L2
L3
L1
Figure 3-104