11-27
11-5 Periodic Maintenance
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
11
Troubleshooting and Maintenance
11-5 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 listed 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
Oil seal: 5,000 hours
Encoder: 30,000 hours
These values presume an ambient motor operating temperature of 40°C, within the allowable
axial load, rated operation (rated torque and rated rotation speed), and proper installation as
described in this manual.
The bearings, reducer, oil seal, and encoder can be replaced for repair work.
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 Servo Drive, transfer to the new Servo
Drive all data needed to resume operation, before restarting
the operation. Equipment damage may result.
Never repair the Servo Drive by disassembling it.
Electric shock or injury may result.
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