7. Maintenance and Inspection
93
7. Maintenance and Inspection
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, Invert-
er 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 com-
pressed air at a pres-
sure of 39.2
×
10
4
to
58.8
×
10
4
Pa, 57 to
85 psi (4 to 6kg/cm
2
).
Printed circuit
boards
Accumulation of con-
ductive material or oil
mist
Blow with dry com-
pressed air at a pres-
sure of 39.2
×
10
4
to
58.8
×
10
4
Pa, 57 to
85 psi (4 to 6kg/cm
2
).
If dust or oil cannot be
removed, replace the
Inverter.
Power elements
and smoothing
capacitor
Abnormal odor or dis-
coloration
Replace the Inverter.
Cooling fan
Abnormal noise or vi-
bration
Cumulative operation
time exceeding
20,000 hours
Replace the cooling
fan.
