2. INSTALLATION
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2.5 Parts having service lives
Service lives of the following parts are listed below. However, the service lives vary depending on
operation and environment.
Number of power-on, forced stop by EM1 (Forced
stop 1), and quick stop command from controller:
100,000 times
Number of on and off for STO: 1,000,000 times
(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, forced stop by EM1 (Forced stop 1) has occurred,
and PC or PLC…etc forced stop has occurred 100,000 times in total, 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) Driver 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.
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