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12-5 Periodic Maintenance
OMNUC G5-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
12
Troubleshooting and Maintenance
12-5 Periodic Maintenance
Servomotors and Servo Drives contain many components and will operate properly only when
each of the individual components is operating properly. Some of the electrical and mechanical
components require maintenance depending on application conditions. Periodic inspection
and replacement are necessary to ensure proper long-term operation of Servomotors and
Servo Drives. (Quoted from The Recommendation for Periodic Maintenance of a General-
purpose Inverter published by JEMA.)
The periodic maintenance cycle depends on the installation environment and application
conditions of the Servomotors and Servo Drives. Recommended maintenance times are given
below for Servomotors and Servo Drives. Use these for reference in periodic maintenance.
Servomotor Life Expectancy
 The lifetimes for the different motor parts are listed below.
Bearings: 20,000 hours
Decelerator:20,000 hours
Oil seal: 5,000 hours
Encoder: 30,000 hours
These values assume an ambient motor operating temperature of 40°C, a shaft load within the
specified value, operation within the rated values (rated torque and rated rotation speed), and
proper installation as described in this manual.
The oil seal can be replaced.
 The radial load during Servomotor operation on timing pulleys and other components contacting
belts is two or more times the static load or more. Consult with the belt and pulley manufacturers
and adjust designs and system settings so that the motor allowable axial load is not exceeded
even during operation. If a motor is used under a shaft load exceeding the allowable limit, the
motor shaft can break and the bearings can be damaged.
Caution
After replacing the unit, transfer to the new unit all data
needed to resume operation, before restarting the operation.
Equipment damage may result.
Never repair the product by disassembling it.
Electric shock or injury may result.
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