Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual page 6

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The load used should be a three-phase induction motor only. Connection of any other electrical
equipment to the inverter output may damage the equipment.
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The electronic overcurrent protection does not guarantee protection of the motor from overheating.
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Do not use a magnetic contactor on the inverter input for frequent starting/stopping of the inverter.
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Use a noise filter to reduce the effect of electromagnetic interference. Otherwise nearby electronic
equipment may be affected.
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Take measures to suppress harmonics. Otherwise power harmonics from the inverter may
heat/damage the power capacitor and generator.
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When a 400V class motor is inverter-driven, it should be insulation-enhanced or surge voltages
suppressed. Surge voltages attributable to the wiring constants may occur at the motor terminals,
deteriorating the insulation of the motor.
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When parameter clear or all clear is performed, each parameter returns to the factory setting. Re-set
the required parameters before starting operation.
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The inverter can be easily set for high-speed operation. Before changing its setting, examine the
performance of the motor and machine.
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In addition to the inverter's holding function, install a holding device to ensure safety.
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Before running an inverter which had been stored for a long period, always perform inspection and
test operation.
(5) Emergency stop
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Provide a safety backup such as an emergency brake which will prevent the machine and equipment
from hazardous conditions if the inverter fails.
(6) Maintenance, inspection and parts replacement
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Do not carry out a megger (insulation resistance) test on the control circuit of the inverter.
(7) Disposing of the inverter
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Treat as industrial waste.
(8) General instructions
Many of the diagrams and drawings in this instruction manual show the inverter without a cover, or partially
open. Never run the inverter like this. Always replace the cover and follow this instruction manual when
operating the inverter.
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