7-3
Table 7.1 List of Periodic Inspections (Continued)
Check part
Check item
How to inspect
Evaluation criteria
Main circuit
Magnetic
contactor
and relay
1) Check for chatters during
operation.
2) Check for rough contacts.
1) Hearing
inspection
2) Visual inspection
1), 2)
No
abnormalities
Control circuit
Printed
circuit
boards
1) Check for loose screws and
connectors.
2) Check for abnormal odor and
discoloration.
3) Check for cracks, breakage,
deformation and remarkable rust.
4) Check the capacitors for
electrolyte leaks and deformation.
1) Retighten.
2) Olfactory and
visual inspection
3), 4)
Visual
inspection
1), 2), 3), 4)
No
abnormalities
Cooling fan
1) Check for abnormal noise and
excessive vibration.
2) Check for loose bolts.
3) Check for discoloration caused by
overheat.
1) Auditory and
visual inspection,
or turn manually
(be sure to turn
the power OFF).
2) Retighten.
3) Visual inspection
1) Smooth rotation
2), 3)
No
abnormalities
Cooling system
Ventilation
path
Check the heat sink, intake and
exhaust ports for clogging and foreign
materials.
Visual inspection
No abnormalities
Remove dust accumulating on the inverter with a vacuum cleaner. If the inverter is stained, wipe it off
with a chemically neutral cloth.
7.3
3B
List of Periodical Replacement Parts
The inverter consists of many electronic parts including semiconductor devices. Table 7.2 lists
replacement parts that should be periodically replaced for preventive maintenance (Use the lifetime
judgment function as a guide). These parts are likely to deteriorate with age due to their constitution
and properties, leading to the decreased performance or failure of the inverter.
When the replacement is necessary, consult your Fuji Electric representative.
Table 7.2 Replacement Parts
Part name
Standard replacement intervals
(See Note below.)
DC link bus capacitor
10 years
Electrolytic capacitors on the printed circuit boards
10 years
Cooling fan
10 years
(Note) These replacement intervals are based on the inverter's service life estimated under the following
conditions.
- Ambient temperature: 40
°
C
- Load factor: 80% of the rated current given in parentheses ( ) in Chapter 8 "Specifications"
- Running 12 hours/day
In environments with an ambient temperature above 40
°
C or a large amount of dust or dirt, the
replacement intervals may be shorter.
Standard replacement intervals mentioned above are only a guide for replacement, not a guaranteed
service life.
