Toshiba TOSVERT VF-AS3, Instruction Manual

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E6582062 
2-67
2. Installation and wiring
2
3
9
10
■ 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.
■ Selective circuit breaking when two or more inverters are used on the same
power line
There is no fuse in the inverter's power circuit. Thus, as the diagram below shows, when more than
one inverter is used on the same power line, you must select interrupting characteristics so that only
ELCB (ELCB1 to ELCBn in the diagram) install in each inverter will trip and the common MCCB
(MCCB in the diagram) will not trip when a short occurs in one inverter.
When you cannot select the proper characteristics, install a circuit interrupting fuse on the secondary
side of ELCB1 to ELCBn.
* MCCB : Molded Case Circuit Breaker
* ELCB : Earth Leakage Circuit Breaker
■ 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.
For details, refer to [10. 3. 1].
■ Disposal
To dispose the inverter, refer to [Chapter 16].
ELCB1 MCCB
Inverter 1
(Circuit breaking fuse)
ELCB2
Inverter 2
ELCBn
Selective circuit breaking of inverters
Inverter n