Delta VFD-ED Series User Manual

Appendix A. EMC Standard Installation GuideVFD-ED
A-8
1
2
3
Pi gt ai l
HF
LF-HF
Brai ded
st rapl
1
This is why a thick short ground wire must be implemented for connecting to the common grounding
path or the ground busbar. Especially when a controller (e.g. PLC) is connected to an AC motor drive,
it must be grounded by a short and thick conducting wire. It is suggested to use a flat braided
conductor (ex: metal mesh) with a lower impedance at high frequencies.
If the grounding wire is too long, its inductance may interfere structure of the building or the control
cabinet and form mutual inductance and stray capacitance. As shown in the Figure A-6, a long
grounding wire could become a vertical antenna and turn into a source of noise.
Long PE
Pai nt ed
sheet met al
HF
Figure A-5
Figure A-6

Delta VFD-ED Series Specifications

General

Brand	Delta
Model	VFD-ED Series
Category	DC Drives
Language	English