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5.3 Phase Failure of Input Power Source
If the inverter is operated for a long time under phase failure, the inverter's service life may be short-
ened remarkably. Use care.
6. Inspection and Maintenance
6.1 Periodical Inspection
In order to maintain the inverter in the best conditions and make it demonstrate its full performances,
carry out periodical inspection once every six months at least and check any matters which cannot be
checked in daily inspection.
The inverter and its peripheral equipment should be inspected by an engineer familiar with safety
precautions and proper handling of electric appliances.
Safety Precautions
1. Turn the inverter power off to avoid electrocution. Open the front cover, and make sure that
the CHG LED in the lower part of the printed circuit board is off.
2. Note that the heatsink may be hot in some operating conditions.
Inspection list
Applicable parts Check points
Unit casing
Check the ventilation holes and heat sink for dust or foreign matters. Clean
them if dusty.
Cooling fan
Check the cooling fan for dust or foreign matters. Clean it if dusty. We
recommend that the cooling fan be replaced after 3 to 5 years of operation,
provided the inverter is used for 12 hours a day.
Inside of unit
Check the printed circuit board and other electronic parts for dust or foreign
matters. Clean them if dusty.
Terminal blocks
& set screws
Check the terminal blocks and set screws for looseness. Retighten them if loose.
Connectors Check the connectors and terminals of the control PCB for looseness.
Wiring
Check the insulating covering of the wires for cracks, deformation or other
defects.
Electrolytic
capacitors
Check the electrolytic capacitors for leakage of electrolyte, discoloration or
other defects. Replace it if some abnormalities are found. The capacitors
should be replaced every five years, provided the inverter is used for 10 hours a
day at the average ambient temperature of 35°C. (See Note below)
Note: Before using spare capacitors which have been stored for three years or more, mount them in
the inverter, disconnect the output cable from the inverter, and apply rated AC current to the
inverter for eight hours for aging of the capacitors.
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