Delta Electronics VFD-M manual External Wiring, Appendix a

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

B1

Brake

Resistor

B2

U/T1 V/T2 W/T3

Zero-phase

Reactor

Output AC

Line Reactor

Motor

Chapter 2 Installation and Wiring

Items	Explanations
Power	Please follow the specific power
	supply requirement shown in
supply
	APPENDIX A.
	There may be inrush current during
Fuse/NFB	power up. Please check the chart of
	APPENDIX B and select the correct
(Optional)
	fuse with rated current. NFB is
	optional.
Magnetic	Please do not use a Magnetic
	contactor as the I/O switch of the AC
contactor
	drive, this will reduce the operating
(Optional)
	life cycle of the AC drive.
	Used to improve the input power
	factor, to reduce harmonics and
	provide protection from AC line
Input AC	disturbances. (Surge, switching
	spike, power flick, etc.) AC line
Line Reactor	reactor should be installed when the
(Optional)	power supply capacity is ≧500kVA
	or phase lead reactor will be
	switched. And the wiring distance
	should not exceed 10m. Please refer
	to Appendix B for detail.
	Zero phase reactors are used to
Zero-phase	reduce radio noise especially when
Reactor	audio equipment installed near the
(Ferrite Core	inverter. Effective for noise reduction
	on both the input and output sides.
Common
	Attenuation quality is good for a wide
Choke)
	range from AM band to 10Mhz.
(Optional)
	Appendix B specifies zero phase
	reactors. (RF220X00A)
EMI filter	To reduce electromagnetic
	interference. Please refer to
(Optional)
	Appendix B for detail.
Brake	Used to reduce stopping time of the
	motor. Please refer to the chart on
Resistor
	Appendix B for specific brake
(Optional)
	resistors.
Output AC	Motor surge voltage amplitudes
	depending on motor cable length. For
Line Reactor	long motor cable applications (>20m),
(Optional)	it is necessary to install on the
	inverter output side.

Revision May 2008, ME14, SW V3.04 2-5