Alpha 6000S series - EMI Filter Selection; Braking Unit and Resistor Function

Chapter 7 Peripheral Equipments
177
7.2 Function of Peripheral Equipment
Table 7-1 Function of Peripheral Equipment
Peripheral
Equipment
& Optional
Elements
Breaker Contactor
* AC
Reactor
*EMI Filter
* Braking Unit
and Braking
resistor
Description
It is used to cut
off the fault
current of the
frequency
inverter rapidly
and prevent the
power fault
caused by fault
with the
inverter and its
circuits.
It is used to cut
off the main
power supply
at the time of
frequency
inverter fault
and prevent
power failure
& restarting
after the fault.
It is used to
improve the
input power
factor,
reduce the
higher
harmonic
and inhibit
the power
surge.
It is used reduce the
radio disturbance
caused by the
frequency inverter.
When the wiring
distance between the
motor and the
frequency inverter is
less than 20m, it is
suggested to be
connected to the power
supply side; when the
distance is over 20m,
is suggested to be
connected at the output
side.
They are selected
and used when the
braking torque
cannot meet the
requirements, and
are applicable on
occasions of
high-inertia load &
frequent braking or
rapid stop.
Remarks: *-marked items are optional elements.
7.2.1 AC Input Reactor
Using AC reactor can restrain higher harmonic wave and improve power factor obviously. In the
following situation, users are advised to use ac reactor.
●Ratio of capacity: power supply source: Inverter>10:1
●Silicon controlled load and switching controlled power factor compensator in a same place.
●Degree of three-phase voltage unbalance is more than 3%
Table 7-2 List of Common AC Input Reactors
Voltage (V)
Power
(kW)
Current
(A)
Inductance
(mH)
Voltage (V)
Power
(kW)
Current
(A)
Inductance
(mH)
Single-Phase
220
0.4 5.1 10
Three-Phase
380
45 96 0.21
0.75 9.2 7.6 55 128 0.18
1.5 13 4.8 75 165 0.13
2.2 25 3.2 93 195 0.11
Three-Phase
380
0.75 3.7 7.6 110 22 0.09
1.5 5.4 4.8 132 262 0.08
2.2 7 3.2 160 302 0.06
4 11 2.0 185 364 0.05
5.5 14 1.5 200 385 0.05
7.5 18 1.2 220 420 0.05
11 27 0.8 250 480 0.04
15 34 0.6 280 530 0.04
18.5 41 0.5 315 605 0.04