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Power factor correction capacitor
Power factor correction capacitors cannot be installed on the output side of the inverter. When a motor
is run that has a power factor correction capacitor attached to it, remove the capacitors. This can cause
inverter malfunction and capacitor destruction.
Operating at other than rated voltage
Connections to voltages other than the rated voltage described in the rating label cannot be made. If a
connection must be made to a power supply other than one with rated voltage, use a transformer to
raise or lower the voltage to the rated voltage.
Circuit breaking when two or more inverters are used on the same power line.
There is no fuse in the inverter's main circuit. Thus, as the diagram above shows, when more than one
inverter is used on the same power line, you must select interrupting characteristics so that only
MCCB2 to MCCBn+1 will trip and the MCCB1 will not trip when a short occurs in the inverter (INV1).
When you cannot select the proper characteristics install a circuit interrupting fuse behind MCCB2 to
MCCBn+1.
If power supply distortion is not negligible
If the power supply distortion is not negligible because the inverter shares a power distribution line with
other systems causing distorted waves, such as systems with thyristors or large-capacity inverters,
install an input reactor to improve the input power factor, to reduce higher harmonics, or to suppress
external surges.
U/T1
Inverter
V/T2
W/T3
Power factor correction capacitor
MCCB1
MCCB2
MCCB3
MCCBn + 1
Breaking of selected inverter
A-15
IM
Remove the power factor correction
capacitor and surge absorber
(circuit breaking fuse)
INV1
INV2
INVn
E6581595
1
MCCB:
No-fuse breaker
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