Delta Electronics VFD-EL manual External Wiring, unitBrak resistorBrake, Bue Br

Chapter 2 Installation and Wiring

2.2 External Wiring

	Power Supply
		FUSE/NFB
		Magnetic
		contactor
		Input AC
		Line Reactor
			Zero-phase
			Reactor
	EMI Filter		unitBrak resistorBrake
R/L1	S/L2	T/L3
		+
			BUE BR
U/T1	V/T2	-
		W/T3
			Zero-phase
			Reactor
		Output AC
		Line Reactor
	Motor

Items	Explanations
Power	Please follow the specific power
	supply requirements shown in
supply
	Appendix A.
	There may be an inrush current
Fuse/NFB	during power up. Please check the
	chart of Appendix B and select the
(Optional)
	correct fuse with rated current. Use of
	an NFB is optional.
Magnetic	Please do not use a Magnetic
	contactor as the I/O switch of the AC
contactor
	motor drive, as it will reduce the
(Optional)
	operating life cycle of the AC drive.
	Used to improve the input power
	factor, to reduce harmonics and
	provide protection from AC line
	disturbances. (surges, switching
Input AC	spikes, short interruptions, etc.). AC
Line Reactor	line reactor should be installed when
(Optional)	the power supply capacity is 500kVA
	or more or advanced capacity is
	activated. The wiring distance should
	be ≤ 10m. Refer to appendix B for
	details.
	Zero phase reactors are used to
Zero-phase	reduce radio noise especially when
	audio equipment is installed near the
Reactor
	inverter. Effective for noise reduction
(Ferrite Core
Common	on both the input and output sides.
	Attenuation quality is good for a wide
Choke)
	range from AM band to 10MHz.
(Optional)
	Appendix B specifies the zero phase
	reactor. (RF220X00A)
	It is used to reduce electromagnetic
EMI filter	interference. All 230V and 460V
	models are built-in EMI filter.
Brake	Used to reduce the deceleration time
Resistor and	of the motor. Please refer to the chart
Brake Unit	in Appendix B for specific Brake
(Optional)	Resistors.
	Motor surge voltage amplitude
Output AC
	depends on motor cable length. For
Line Reactor
	applications with long motor cable
(Optional)	(>20m), it is necessary to install a
	reactor at the inverter output side

2-8 Revision August 2008, 2ELE, V1.02