7 Maintenance and Inspection
187
Periodic Inspection
Periodically inspect the Inverter as described in the following table to
prevent accidents and to ensure high performance with high reliability.
Location to
Check
Check for
Solution
Terminals, In-
verter mounting
screws, etc.
Improper seating or
loose connections in
hardware.
Properly seat and tighten
hardware.
Heatsinks
Buildup of dust, dirt, and
debris
Blow with dry compressed air
at a pressure of 39.2
×
10
4
to
58.8
×
10
4
Pa (4 to 6 kg/cm
2
).
Printed circuit
boards
Accumulation of conduc-
tive material or oil mist
Blow with dry compressed air
at a pressure of 39.2
×
10
4
to
58.8
×
10
4
Pa (4 to 6 kg/cm
2
).
If dust or oil cannot be re-
moved, replace the Inverter.
Power elements
and smoothing
capacitor
Abnormal odor or discol-
oration
Replace the Inverter.
Cooling fan
Abnormal noise or vibra-
tion
Cumulative operation
time exceeding 20,000
hours
Replace the cooling fan.
