Mitsubishi Electric MELSERVO-J3W Series, Instruction Manual

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2. INSTALLATION
2 - 6
2.6 Parts having service lives
Service lives of the following parts are listed below. However, the service lives vary depending on operating
methods and environmental conditions. If any fault is found in the parts, they must be replaced immediately
regardless of their service lives. For parts replacement, please contact your sales representative.
Part name Life guideline
Smoothing capacitor 10 years
Relay
Number of power-on, forced stop, and controller
forced stop times: 100000 times
Cooling fan 50,000 to 70,000 hours (2 to 3 years)
Absolute position battery Refer to section 12.2
(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 (40 (104 ) surrounding air temperature or
less).
(2) Relays
Their contacts will wear due to switching currents and contact faults occur. Relays reach the end of their
lives when the power is turned on and forced stop/controller forced stop occurs 100,000 times in total.
(3) Servo amplifier cooling fan
The cooling fan bearings reach the end of their life in 50,000 to 70,000 hours. Normally, therefore, the fan
must be changed in seven or eight years of continuous operation as a guideline.
It must also be changed if unusual noise or vibration is found during inspection.
The life of the servo amplifier cooling fan applies under an environment of an average ambient temperature
of 40 (104 ) a year, and a corrosive gas-free, flammable gases-free, an oil-mist-free, and a dust-free
environment.