Delta EB3000 Series User Manual page 455

Appendix A. EMC Standard Installation GuideEB3000
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.
Pigtail
1
2
1
Braided
3
strapl
Painted
sheet metal
HF
A-8
HF
LF-HF
Figure A-5
Figure A-6