6 - 2
6. INSPECTION
(1) Smoothing capacitor
Affected by ripple currents, etc. and deteriorates in characteristic. The life of the capacitor greatly
depends on ambient temperature and operating conditions. The capacitor will reach the end of its life
in 10 years of continuous operation in normal air-conditioned environment.
(2) Relays
Their contacts will wear due to switching currents and contact faults occur. Relays reach the end of
their life when the cumulative number of power-on and emergency stop times is 100,000, which
depends on the power supply capacity.
(3) Converter unit/Servo amplifier cooling fan
The cooling fan bearings reach the end of their life in 10,000 to 35,000 hours. Normally, therefore, the
fan must be changed in a few years of continuous operation as a guideline.
It must also be changed if unusual noise or vibration is found during inspection.
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