26.
SELECTION
OF
PERIPHERAL
DEVICE
0
Installation
md
sebctioa
d
ndum~
haker
To protect
the
wiring
in
the primary
side
of
the inverter,
it
is
necessary
to
install a fuse or
no-
fuse breaker (NFB).
The
NFB must
be
selected with regard to the power factor at the power
supply side of inveqer (will vary according to power supply voltage,
output
frequency, and
load). For selection, refer
to
the table above. Especially, when a NFB of electromagnetic type
is used, the operating characteristics vary due to high hamnic currents. This means that the
NFB which is one rank above the proper
size
must
be
selected.
0
Power
factor
Improving
AC
nrctar
If
the inverter is connected direclly
to
a large capacity power transformer (cam: 500kVA or
larger, wiring distance: 10m
(32.83
feel)
or
smaller), or a phase advancer capacitor is
used,
an excessive peak current may flow through the power supply input circuit
to
damage the con-
verter.
In
this situation,
it
may be necessary to install a power factor Improving AC reactor like
the FR-BAL (option).
Inverter
NFB
FR-BAL
b
B
NoIes:
1.
Input power faclor is improvd to approx.
90%.
2.
Select
the
power
factor improving
AC
reactor to meet
the
motor capacity. Even
if
the
inverter
capacity is large than
the
motor capacity,
selection
must
be
made
on
the
basis
of
motor
3.
For
the
motor smaller than
0.4kW
(1/2
HP),
select
the
reactor for
0.4kW
(1/2
HP)
motor. In
capacity.
this
case,
DOwer
factor
will
be
a
little
lower
than
90%.
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