Delta Electronics VFD-G manual External Wiring, Choke, BR Brake resistor, Vf Db, Brake unit

2.2 External Wiring

Power Supply

			FUSE/NFB
			Magnetic
			contactor
			Input AC
			Line Reactor
			Zero-phase
			Reactor
	EMI Filter
R/L1	S/L2	T/L3	+1
			DC
			Choke
			+2	BR Brake resistor
			VF DB
U/T1	V/T2		-	Brake unit
		W/T3
			Zero-phase
			Reactor
			Output AC
			Line Reactor
	Motor

	Chapter 2 Installation and Wiring
Items	Explanations
Power	Please follow the specific power
	supply requirements shown in
supply
	Appendix A.
	There may be an inrush current during
Fuse/NFB	power up. Please check the chart of
	Appendix B and select the correct fuse
(Optional)
	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 phase lead reactor will be switched.
	And the mains wiring distance ≤ 10m.
	Please refer to Appendix B for more
	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)
EMI filter	To reduce electromagnetic
	interference, please refer to Appendix
(Optional)
	B for more details.
Brake	Used to reduce the deceleration time
	of the motor. Please refer to the chart
Resistor
	in Appendix B for specific Brake
(Optional)
	Resistors.
Output AC	Motor surge voltage amplitude
	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.

Revision July 2008, EG03, SW V1.06 2-7