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
Содержание 6000S series
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