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3.2 Installation of a reactor
When the inverter is connected near a large-capacity power transformer (1000kVA or more) or when a power 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 the optional AC reactor (FR-HAL)
MCCB
Power
supply
* When connecting the FR-HEL to the FR-A720-02150 (FR-A740-01100) or less, remove the jumper across terminals P/+ and P1.
For the FR-A720-02880 (FR-A740-01440) or more, a DC reactor is supplied. Always install the reactor.
When using the FR-A720-02150 with LD or SLD set, always use a DC reactor (option FR-HEL-75K).
When using the FR-A740-01100 with LD or SLD set, always use a DC reactor (option FR-HEL-H90K)
REMARKS
The wiring length between the FR-HEL and inverter should be 5m (16.4feet) maximum and minimized. Use the same wire size as
that of the power supply wire (R/L1, S/L2, T/L3). (Refer to page 20)
AC reactor
Inverter
(FR-HAL)
MC
R
X
R/L1
U
Y
S
S/L2
V
Z
T
W
T/L3
P/+
P1
DC reactor (FR-HEL) *
(kVA)
5300
5000
Capacities requiring
installation of
4000
IM
AC reactor
3000
2000
1000
110165 247 330 420
Inverter capacity
Installation of a reactor
550 kVA
57
3
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