Parts Having Service Life - Mitsubishi Electric MR-JE-_A Instruction Manual

2. INSTALLATION

2.5 Parts having service life

Service life of the following parts is listed below. However, the service life varies depending on operating
methods 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 normal 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 will reach the end of
their lives depending on their power supply capacity when the number of power-on times and number of
forced stop times by EM1 (Forced stop 1) are 100,000 times in total.
(3) Servo amplifier cooling fan
The cooling fan bearings reach the end of their life in 50,000 hours to 70,000 hours. Normally, therefore,
the cooling fan must be replaced in seven to eight 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 and forced stop times
Relay
50,000 hours to 70,000 hours (7 years to 8
Cooling fan
2 - 5
Life guideline
10 years
by EM1 (Forced stop 1): 100,000 times
years)