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10-5
Inspection cycle
Inspection
location
Inspection item Inspection content Inspection method Criteria
Standard
replacement
period
Instruments
Regularly
Periodic
Control
circuit
Operation check (1) Check the balance of the
output voltage of
individual phases when
operating the inverter
independently.
(2) Conduct a sequence
protection operation test,
and make sure that there
are no errors in the protec-
tion and display circuits.
(1) Measure the
voltage between
the phases of
inverter output
terminals U, V,
and W.
(2) Simulate
operation of the
inverter protect-
ion circuit.
(1) Within 2% voltage
difference between
phases.
(2) Operate without any
abnormalities.
___
__
Compo-
nent
check,
including
printed-
circuit
boards
Overall (1) No abnormal odor or
changes in color.
(2) No significant corrosion.
Visual inspection No abnormalities
___
Capacitor No fluid leakage or
deformation.
Visual inspection 5 years
(Note 1)
___
Display Digital operation
panel
(1) No illegible display
(2) No lack of character
(3) No blown out LEDs
Visual inspection Normal operation
Display can be read out.
7 years
___
___
No abnormalities
Note 1. The life of the capacitor is affected by the ambient temperature. Refer to the ambient temperature - capaciitor life curve shown in Appendix 5.
Note 2. The inverter must be cleaned periodically. If dust accumulates on the fan and heat sink, it can cause overheating of the inverter.
Daily Inspection and Periodic Inspection (3/3)