Mitsubishi Electric Melservo-J3 Series MR-J3-B, Instruction Manual

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2. INSTALLATION
(6) Check for unusual noise generated from the servo amplifier.
2.5 Parts having service lives
The following parts must be changed periodically as listed below. If any part is found faulty, it must be changed
immediately even when it has not yet reached the end of its life, which depends on the operating method and
environmental conditions. For parts replacement, please contact your sales representative.
Part name Life guideline
Servo amplifier
Smoothing capacitor 10 years
Relay
Number of power-on and number of emergency stop
times : 100,000 times
Cooling fan 10,000 to 30,000hours (2 to 3 years)
Absolute position battery Refer to section 5.8
(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) Servo amplifier cooling fan
The cooling fan bearings reach the end of their life in 10,000 to 30,000 hours. Normally, therefore, the
cooling 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.