Delta VFD-EL-W Series, User Manual

Page: 27 / 197

Chapter 2 Installation and Wiring

VFD-EL-W
2-6
2.2 External Wiring
Items Explanations
Power supply
Please follow the specific power supply
requirements in Appendix A.
Fuse/NFB
(optional)
There may be an inrush current during power-
up. Please check the chart in Appendix B and
select the correct fuse for the rated current. Use
of an NFB is optional.
Magnetic
contactor
(optional) Do not use a magnetic contactor as the I/O
switch for the AC motor drive, as it will reduce
the operating life of the AC drive.
Input AC Line
Reactor
(optional)
Use to improve the input power factor, reduce
harmonics and provide protection from AC line
disturbances (such as surges, switching spikes,
short interruptions). Install an AC line reactor
when the power supply capacity is 500 kVA or
more, or advanced capacity is activated. The
wiring distance should be

10m. Refer to
Appendix B for details.
Zero-phase
Reactor
(Ferrite Core
Common
Choke)
(optional)
Use zero phase reactors to reduce radio noise,
especially when audio equipment is installed
near the inverter. They are effective for noise
reduction on both the input and output sides.
Attenuation quality is good for a wide range from
the AM band to 10 MHz. Appendix B lists the
specifications for zero-phase reactors
(RF220X00A).
EMI filter Use to reduce electromagnetic interference.
Output AC
Line Reactor
(optional)
Motor surge voltage amplitude depends on
motor cable length. For applications with long
motor cable (>20 m), install a reactor at the
inverter output side.