Yaskawa Sigma II Series Servo System - Manual (Page 390)

Sigma II User’s Manual Chapter 9: Inspection, Maintenance, and Troubleshooting
9 - 2
9.1 Servodrive Inspection and Maintenance
This section describes the basic inspections and maintenance of servomotors and servo
amplifiers and the procedures for replacing the battery for absolute encoders.
9.1.1 Servomotor Inspection
For inspection and maintenance of servomotors, follow the simple, daily inspection
procedures in the following table.
The AC servomotors are brushless. Simple, daily inspection is sufficient under most
conditions. The inspection and maintenance frequencies in the table are only
guidelines. Increase or decrease the frequency to suit the operating conditions and
environment.
Servomotor Inspection
*1
Measure across the servomotor FG and the U-phase, V-phase, or W-phase power line
• During inspection and maintenance, do not disassemble the servomotor.
If disassembly of the servomotor is required, contact Yaskawa.
Action or
Problem
Frequency Procedure Comments
Vibration and
Noise
Daily Touch and listen. Levels higher than normal?
Exterior Dirt
According to degree
of contamination
Clean with cloth or com-
pressed air.
—
Insulation
Resistance
Measurement
At least every year
Disconnect servo amplifier
and test insulation resis-
tance at 500V. Must
exceed 10M
Ω. *1
Contact Yaskawa if the insu-
lation resistance is below
10M Ω.
Oil Seal
Replacement
At least every 5000
hours
Remove servomotor from
machine and replace oil
seal.
Applies only to motors with
oil seals.
Servomotor
Overhaul
At least every 20000
hours or 5 years
Contact Yaskawa.
The user should not disas-
semble and clean the servo-
motor.
IMPORTANT