Parts Having Service Life - Mitsubishi Electric MR-J4-10B(-RJ) Instruction Manual

2. INSTALLATION
(5) Check for dust accumulation on the servo amplifier.
(6) Check for unusual noise generated from the servo amplifier.
(7) Make sure that the emergency stop circuit operates properly such that an operation can be stopped
immediately and a power is shut off by the emergency stop switch.

2.6 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.
(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 air-conditioned environment (ambient
temperature of 40 °C or less).
(2) Relays
Contact faults will occur due to contact wear arisen from switching currents. Relays reach the end of
their life when the power has been turned on, forced stop by EM1 (Forced stop 1) has occurred, and
controller 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 life 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. If unusual noise
or vibration is found during inspection, the cooling fan must also be replaced.
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, forced stop by EM1 (Forced
stop 1), and controller forced stop times: 100,000
Relay
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
2 - 7
Life guideline
10 years
Refer to section 12.2.