Installation of a reactor
76
PRECAUTIONS FOR USE OF THE INVERTER
• Determining if a countermeasure is required
A countermeasure for harmonics is required if the following condition is satisfied: outgoing harmonic current > maximum
value per 1 kW contract power
contract power
• Harmonic suppression techniques
3.3
Installation of a reactor
When the inverter is connected near a large-capacity power transformer (1000 kVA or more) or when a power factor
correction capacitor is to be switched over, an excessive peak current may flow in the power input circuit, damaging the
converter circuit. To prevent this, always install an optional AC reactor (FR-HAL).
No.
Item
Description
1
Reactor installation
(FR-HAL)
Because a DC reactor is built in on the DC side of this product, outgoing harmonic current can be
suppressed. By installing an AC reactor (FR-HAL) on the AC side of the inverter, the outgoing harmonic
current suppression performance can be improved.
2
High power factor
converter (FR-HC2),
multifunction
regeneration converter
(FR-XC)
This converter trims the current waveform to be a sine waveform by switching the rectifier circuit
(converter module) with transistors. Doing so suppresses the generated harmonic amount significantly.
Connect it to the DC area of an inverter. Use the high power factor converter (FR-HC2) with the
accessories that come as standard. To use the FR-XC series converter, use the converter with an FR-
XCB box-type reactor and enable the harmonic suppression function.
3
Installation of power
factor improving
capacitor
When used with a reactor connected in series, the power factor improving correction capacitor can
absorb harmonic currents.
4
Transformer multi-phase
operation
Use two transformers with a phase angle difference of 30
˚
as in -
∆
and
∆
-
∆
combinations to provide an
effect corresponding to 12 pulses, reducing low-degree harmonic currents.
5
Passive filter
(AC filter)
A capacitor and a reactor are used together to reduce impedances at specific frequencies. Harmonic
currents are expected to be absorbed greatly by using this technique.
6
Active filter
This filter detects the current in a circuit generating a harmonic current and generates a harmonic current
equivalent to a difference between that current and a fundamental wave current to suppress the
harmonic current at the detection point. Harmonic currents are expected to be absorbed greatly by using
this technique.
MCCB
MC
Inverter
AC reactor
(FR-HAL)
Power
supply
R
S
T
Z
Y
X
U
V
W
R/L1
S/L2
T/L3
M
5000
5300
4000
3000
2000
1000
110165 247 330 420
550 kVA
Capacities requiring
installation of
AC reactor
Inverter capacity
Power supply system
capacity
(kVA)
