12-32
12-5 Periodic Maintenance
OMNUC G5-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
12
Troubleshooting and Maintenance
Servo Drive Life Expectancy
 The lifetimes for the different drive parts are given below.
Aluminum electrolytic capacitors: 28,000 hours (at an ambient drive operating temperature of
55°C, constant output at rated torque, constant output at rated rotation speed, and installation as
described in this manual)
Axial-flow fan: 10,000 to 30,000 hours (The limit depends on the operating conditions.)
Inrush current prevention relay: Approx. 20,000 operations (The limit depends on the operation
conditions.)
 When using the Servo Drive in continuous operation, use fans or air conditioners to maintain the
ambient temperature below 40°C. We recommend that the ambient temperature and the power
supply ON time be reduced as much as possible to lengthen the service life of the Servo Drive.
 The limit of aluminum electrolytic capacitors is greatly affected by the ambient operating
temperature. Generally, an increase of 10°C in the operating ambient temperature will reduce
capacitor service life by 50%.
For example, when the ambient operating temperature is 25°C, the life expectancy will be as
follows:
 The aluminum electrolytic capacitors deteriorate even when the Servo Drive is stored with no
power supplied. If the Servo Drive is not used for a long time, we recommend periodic inspection
and a part replacement period of 5 years. If the Servomotor or Servo Drive is not to be used for a
long time, or if they are to be used under conditions worse than those described above, a periodic
inspection period of 5 years is recommended.
 Upon request, OMRON will inspect the Servo Drive and Servomotor and determine if part
replacement is required.
Life expectancy at 25°C = Life expectancy at 55°C × 2
55 - 25
10
= 224,000 hours
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