Chapter 2 Installation and Wiring_VFD-B Series
2-18
Revision 10/2005, BE13, SW V4.08
2.4.2 External Wiring
Motor
Output AC
Line Reactor
Power Supply
Magnetic
contactor
Input AC
Line Reactor
EMI Filter
R/L1 S/L2
T/L3
U/T1 V/T2
W/T3
+2/B1
B2
Braking
Resistor
Zero-phase
Reactor
DC
Choke
+1
Zero-phase
Reactor
FUSE/NFB
Items Explanations
Power supply
Please follow the specific power supply
requirements shown in Appendix A.
Fuse/NFB
(Optional)
There may be an inrush current during
power up. Please check the chart of
Appendix B and select the correct fuse
with rated current. Use of an NFB is
optional.
Magnetic
contactor
(Optional)
Please do not use a Magnetic contactor
as the I/O switch of the AC motor drive,
as it will reduce the operating life cycle
of the AC drive.
Input AC Line
Reactor
(Optional)
Used to improve the input power factor,
to reduce harmonics and provide
protection from AC line disturbances.
(surges, switching spikes, short
interruptions, etc.). AC line reactor
should be installed when the power
supply capacity is 500kVA or more and
exceeds 6 times the inverter capacity,
or the mains wiring distance
10m.
Zero-phase
Reactor
(Ferrite Core
Common
Choke)
(Optional)
Zero phase reactors are used to reduce
radio noise especially when audio
equipment is installed near the inverter.
Effective for noise reduction on both the
input and output sides. Attenuation
quality is good for a wide range from
AM band to 10MHz. Appendix B
specifies the zero phase reactor.
(RF220X00A)
EMI filter
(Optional)
To reduce electromagnetic interference,
please refer to Appendix B for more
details.
Braking
Resistor
(Optional)
Used to reduce the deceleration time of
the motor. Please refer to the chart in
Appendix B for specific Braking
Resistors.
Output AC
Line Reactor
(Optional)
Motor surge voltage amplitude depends
on motor cable length. For applications
with long motor cable (>20m), it is
necessary to install a reactor at the
inverter output side.
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