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2. INSTALLATION
2.6 Parts having service lives
Service lives of the following parts are listed below. However, the service lives vary depending on operation
and environment. If any fault is found in the parts, they must be replaced immediately regardless of their
service lives. For parts replacement, please contact your local sales office.
(1) Smoothing capacitor
The characteristic of smoothing capacitor is deteriorated due to ripple currents, etc. 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 (40 C
surrounding air temperature or less).
(2) Relays
Contact faults will occur due to contact wear arisen from switching currents. Relays reach the end of
their lives when the power has been turned on 100,000 times, or when the STO has been turned on and
off 1,000,000 times while the servo motor is stopped under servo-off state. However, the lives of relays
may depend on the power supply capacity.
(3) Servo amplifier cooling fan
The cooling fan bearings reach the end of their life in 10,000 hours to 30,000 hours. Normally, therefore,
the cooling fan must be replaced in a few years of continuous operation as a guideline. It must also be
changed if unusual noise or vibration is found during inspection.
The life indicates under the yearly average ambient temperature of 40 C, free from corrosive gas,
flammable gas, oil mist, dust and dirt.
Part name
Smoothing capacitor
Number of power-on times: 100,000 times
Relay
Number of on and off for STO: 1,000,000
10,000 hours to 30,000 hours (2 years to 3
Cooling fan
Absolute position battery
2 - 7
Life guideline
10 years
times
years)
Refer to section 12.2.
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