Delta VFD-ED Series User Manual

Appendix A. EMC Standard Installation GuideVFD-ED
A-5
2. Common-mode noise in the power cable is transmitted through the stray capacitance and coupled
into the adjacent signal cable, as shown in Figure A-2. Several methods can be applied to reduce
the effect of this common-mode noise; for example, shield the power cable and/or the signal
cables, separate the power and signal cables, take the input and output side of the signal cable
and twist them together to balance out the stray capacitance, let power cables and signal cables
cross at 90°, etc.
Noi se
Unshi el ded cabl e
Ground
Cst r ay
Pow er
suppl y
Syst em
Cabl e
3. Common-mode noise is coupled via the power cable to other power systems then the cable of
such a power system is coupled to the transmission system, as shown in Figure A-3.
Noi se
Unshi el ded cabl e
Ground
Cst r ay
Send
L oad
Recei v e
Figure A-2
Figure A-3

Delta VFD-ED Series Specifications

General

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