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1.10.4 Regarding the installation of the power factor
improving reactor
When the inverter is installed near a large-capacity power transformer (500kVA or
more at the wiring length of 10m or less) or the power capacitor is to be switched, an
excessive peak current will flow in the power supply input circuit, damaging the
converter circuit. In such a case, always install the power factor improving reactor (FR-
BEL or FR-BAL).
FR-BAL
NFB
R
Power
S
supply
T
REMARKS
* When connecting the FR-BEL, remove the jumper across terminals P<+>-P1.
The wiring length between FR-BEL and inverter should be 5m maximum and as short as
possible.
Use the cables which are equal in size to those of the main circuit. (Refer to page 6)
CAUTION
•The power factor improving capacitor and surge suppressor on the inverter
output side may be overheated or damaged by the harmonic components of
the inverter output. Also, since an excessive current flows in the inverter to
activate overcurrent protection, do not insert a capacitor and surge
suppressor. Use a power factor improving reactor for power factor
improvement.
•If a surge voltage occurs in the power supply system, this surge energy may
flow into the inverter, causing the inverter to display OV1, OV2 or OV3 and
come to an alarm stop. In such a case, also install the optional FR-BEL or FR-
BAL power factor improving reactor.
Inverter
X
R
U
Y
S
V
Z
W
T
P P1
FR-BEL (*)
27
1500
Power factor
improving
1000
reactor
installation range
500
0
10
Peripheral Devices
(m)
Wiring length
1
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