Mitsubishi Electric MELSERVO-J4 series, Instruction Manual

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2 INSTALLATION
2.5 Parts having service life
2.5
Parts having service life
Service life of the following parts is listed below. However, the service life varies depending on operation and environment. If
any fault is found in the parts, they must be replaced immediately regardless of their service life. For parts replacement,
please contact your local sales office.
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 be the end of its life in 10 years of continuous operation
in air-conditioned environment (ambient temperature of 40 °C or less for use at the maximum 1000 m above sea level, 30 °C
or less for over 1000 m to 2000 m).
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 sudden stop command from controller has
been executed 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.
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
 , free from corrosive gas, flammable gas, oil mist,
dust and dirt.
Part name Life guideline
Smoothing capacitor 10 years
Relay Number of power-on, forced stop by EM1 (Forced stop 1), and sudden stop command from controller:
100,000 times
Number of on and off for STO: 1,000,000 times
Cooling fan 10,000 hours to 30,000 hours (2 years to 3 years)
Absolute position battery  Page 450 Battery