6-6
6-1 Inspection and Maintenance
6
Inspection and Maintenance
Motor
General
Check that there
are no abnormal
vibrations or
sounds.
Acoustic, feeling, and/
or visual inspection
No faults
Check that there
are no abnormal
odors.
Check that there is no
abnormal odor
caused by damage or
overheating.
No faults
Insulation
resistance
Megger check
(Between the
collective motor
terminals and
ground terminal)
Disconnect Inverter
main circuit terminals
U/T1, V/T2, and
W/T3, and short-
circuit the 3-phase
motor wires. Then,
use a megger to
measure the
resistance between
the motor wire and
ground terminal.
5 M min.
500 V DC
megger
Inspection
part
Inspection
item
Inspection point
Inspection period
Inspection method Criteria Meter
Daily
Periodic
1 year 2 years
*1. The life of the smoothing capacitor depends on ambient temperature.
Refer to "Appendix-2 Product Life Curve" for the replacement reference.
*2. The life of the cooling fan varies depending on the environmental conditions, such as ambient temperature
and/or dust. Check the operation through daily inspections.
*3. The replacement reference (year/cycle) or "
Appendix-2 Product Life Curve" is based on the expected design
life, which is not guaranteed.
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