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26.
SELECTION
OF
PERIPHERAL DEVICE
0
Installation
m d sebctioa d n d u m ~ h a k e r
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 h a m n i c 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 ( c a m : 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
w i l l be
a
little
lower
than
90%.
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