2.2.2 PERIODIC INSPECTION
(1) Inspection criteria
Check the motor at periodic intervals, referring to the following troubleshooting chart. If the
motor is used under a severe working condition, earlier or more frequent preventive maintenance
is required.
Operation time more than 12 hours/day 8 – 12 hours/day
Inspection interval Once a year Once every two years
Location Check item Criteria Remedy
Roller bearing Bearing (sealed type)
Check grease leaks, noise, adherence of
dust visually or audibly.
Replace.
Tightened areas
Joined parts
Check for damage or rough surface due
to corrosion visually.
Clean.
Fasteners
Check for looseness, corrosion or seizure
visually or by tapping.
Retighten, apply
anti-rust or replace.
Terminals
Joined areas
Check for damage or rough surface due
to corrosion visually.
Clean.
Connections
Visually check that connections are
correct and not loose, and that proper
insulation is ensured.
Retighten.
Lead wire Check coating for damage visually.
Ask specialist for
repair.
Stator and rotor
assembly
Iron core Check for adherence of dust visually. Clean.
Coil and insulation
at connections
Insulation resistance is more than 1 MΩ.
(Use 500 V megger)
Clean.
Heat.
Varnish.
Rotation sensor
Measure resistance 620 ± 60 Ω (20°C or 68°F) Replace.
Measure gap 0.7 ± 0.3 mm [0.028 ± 0.012 in.]
Ask specialist for
adjustment.
Thermo sensor Measure resistance 13.04 kΩ ± 10% (20°C or 68°F)
Ask specialist for
repair.
Painting Damage
Check for damage, discoloration, peeling,
or corrosion visually.
Apply anti-rust.
Paint again.
Cleanliness
Deposit of
contaminants or dust
Check for contamination, adherence of
dust or corrosion visually.
Clean or apply anti-
rust.
Paint.
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