Delta Electronics VFD-S manual Application

			Appendix B AccessoriesVFD-S Series
	Application 3		Question
	Used to improve the input power factor, to		When the mains power capacity is too large,
	reduce harmonics and provide protection		line impedance will be small and the charge
	from 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			small-capacity
	large-capacity
			AC motor drive
	power	reactor

motor

Revision August 2008, SE09, SW V2.61 B-13