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8. Maintenance and Inspection
8-2
(2) Servo Drive Inspection
Inspection
Item
Inspection Period How to inspect
What to do if abnormality is
found
Cleaning of the
main body and
the board
At least once a year
Check if there is any dust or
oil on it. Clean with air pressure or
cloth.
Loose screws At least once a year
Check whether screws on
terminals and connectors are
loose.
Fasten the screws.
Defective parts
on the main
body or the
board
At least once a year
Check whether there is any
discoloration, damage, or
disconnection caused by heat.
Contact our company.
8.1.3 Parts Replacement Cycle
The following parts may experience low performance or malfunction because of mechanical
friction and aging. It is therefore important to conduct regular maintenance checks and
replace parts.
1. Smoothing condenser: This part ages because of the impact of ripple current and other factors. Its
lifespan greatly depends on the surrounding temperature and environment. When continuously
used in a air-conditioned ordinary environment, it lasts 10 years on average. Inspect it at least
once a year because it ages rapidly over a short period of time once it starts to do so. (Inspect more
frequently when it gets closer to its obsolescence.)
※
Criteria for visual inspection:
a. Case's condition: Expanded sides and bottom of the case
b. Lid's condition: Notable expansion, severe cracks, or broken parts
c. Explosion valve's condition: Notable valve expansion and operation
d. Besides, check regularly if there is any crack, broken part, discoloration, or leak on the exterior.
A condenser shall be deemed obsolete when its capacity becomes 85[%] or lower of the rated
capacity.
2. Relays: Bad connection occurs because of wear and tear at the contact caused by switching
current. A relay is deemed obsolete when its accumulated switching reaches 100,000 times as it
depends greatly on power capacity.
3. Motor bearing: Replace when it reaches 20,000 to 30,000 hours of operation at the rated speed
under the rated load. Replace if abnormal sound or vibration is detected during inspection, which
are dependent on operating conditions.
[Standard Part Replacement Cycle]
Part Name Standard Replacement Cycle Method
Smoothing condenser 7-8 years Replace (decide after inspection).
Relays - Decide after inspection.
Fuses 10 years Replace.
Aluminum electrolytic
condensers
on printed boards
5 years
Replace with new boards (decide after
inspection).
Cooling fans 4-5 years Replace.
Motor bearings - Decide after inspection.
Motor oil seals 5,000 hours Replace.