Delta Electronics VFD-G manual Reduce harmonics and provide protection from

		Appendix B Accessories
Application 3		Question
Used to improve the input power factor, to		When the mains power capacity is too large,
reduce harmonics and provide protection from		line impedance will be small and the charge
AC line disturbances (surges, switching		current will be too high. This may damage AC
spikes, short interruptions, etc.). The AC line		motor drive due to higher rectifier
reactor should be installed when the power		temperature.
supply capacity is 500kVA or more and
exceeds 6 times the inverter capacity, or the
mains wiring distance	≤ 10m.
Correct wiring
large-capacity		small-capacity
		AC motor drive
power	reactor

motor

Revision July 2008, EG03, SW V1.06 B-9