Filter
Top Products
I-5
9. 4 Application and functions of options
Separate type options shown below are prepared for the inverter VF-A7
Sorts of separate-type options
No. Option name Function, purpose.
Input AC reactor
(ACL)
DC reactor(DCL)
To be used for improvement of input power-factor of the inverter power source, for reducing
higher harmonic or suppressing external surge. The input reactor can be installed when the
power capacity is 500 kVA or more and it is 10 times or more as high as the inverter capacity
or there are some source distorted wave generation such as a thyristor, etc. and a high
capacity inverter connected with the same distribution system.
The DC reactor is superior to the input AC reactor in power-factor improvement. For the
inverter system that is required to be high reliable, it is recommended to use the input AC
reactor that effectually suppresses external surge together with the DC reactor.
High attenuation
radio noise filter
(LC filter) NF type,
(manufactured by
Soshin Electric
Co., Ltd.)
Effectual to prevent audio equipment used near the inverter from radio interference.
Install this filter in the inverter’s input side.
Excellent attenuation characteristic for wide frequency band from AM radio band nearly to
10 MHz.
To be used when electric appliances that are easily affected by noise are installed in the
periphery of the inverter
Simple radio noise
filter (capacitive
filter)
(Manufactured by
Malcon Electronics
Co., Ltd.)
Effectual to prevent audio equipment used near the inverter from radio interference.
Install this filter in the inverter’s input side.
Attenuation characteristic for a certain frequency band. Effectual for noise reduction of
specific AM radio broadcastings (weak radio wave in mountain area).
Leak current increases because of the condenser type. If ELCB is installed in the power
supply side, avoid using multiple units.
Radio noise reduction filter
Zero-phase reactor
(Inductive filter)
(Ferrite core type,
manufactured by
Soshin Electric
Co., Ltd.)
Effectual to prevent audio equipment used near the inverter from radio interference.
Effectual to reduce noise in the input and output sides of the inverter.
Excellent attenuation characteristic for several decibels in wide frequency band from AM
radio band nearly to 10 MHz.
EMI filter for CE
compliance
If EMI filter is installed in proper connection, the inverter has consistency with EMC
commands. However, installation of EMI filter is not required for the inverters of 200 V, 0.4-
7.5 kW or 400 V, 0.75-15 kW models, because those models have built-in noise filters as
standard specifications.
Braking resistor
To be used to shorten deceleration time for the reason of frequently operated quick
deceleration and suspension or high inertia load. This increases consumption of
regenerative energy in dynamic braking.
Resistor and protective thermal relay are built in.
Effect
Harmonic suppression
Type of reactor
Power-factor
improvement
200 V, 3.7 kW or less Other combination
External surge
suppression
Input AC reactor Effective Effective Effective Effective
DC reactor Very effective Effective Very effective Not effective
Molded case
circuit breaker
(
MCCB
)
N.F.
moto
r
IM
Magnetic
conductor
(MC)
Power supply
Input AC reactor
(
ACL
)
High attention radio
noise filter
Zero-phase reactor
ferrite core type
radio noise filter
EMI filter for CE
com
p
liance
Simple radio
noise filter
DC reactor
(
DCL
)
Braking resistor
Zero-phase
reactor
ferrite core
type radio
noise filte
r
VF-A7
N.F.
Motor end surge
voltage suppression
filter (for 400V
models only)
Control power
converter unit
Motor noise
reduction filte
r