Sigma II User’s Manual Chapter 9: Inspection, Maintenance, and Troubleshooting
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9.1.2 Servo Amplifier Inspection
For inspection and maintenance of the servo amplifier, follow the inspection proce-
dures in the following table. Perform inspection and maintenance at least once every
year. Other routine inspections are not required.
Servo Amplifier Inspection
Part Replacement Schedule
The following parts are subject to mechanical wear or deterioration over time. To
avoid failure, replace these parts at the frequency indicated.
The parameters of any servo amplifiers overhauled by Yaskawa are reset to the
default (standard factory) settings before shipping. Be sure to confirm that the
parameters are set to the application’s requirements before starting operation.
Periodic Part Replacement
Operating Conditions:
Ambient Temperature: Annual average of 30°C.
Load Factor: 80%, maximum.
Operation Rate: 20 hours/day, maximum.
Action or
Problem
Frequency Procedure Comments
Clean interior and
circuit boards
At least every year
Check for dust, dirt, and oil
on the surfaces.
Clean with compressed air.
Loose screws At least every year
Check for loose terminal
block and connector
screws.
Tighten any loose screws.
Defective parts in
unit or on circuit
boards
At least every year
Check for discoloration,
damage or discontinuities
due to heating.
Contact Yaskawa.
Part Standard Lifespan Replacement Method
Cooling fan 4 to 5 years Replace with new part.
Smoothing capacitor 7 to 8 years Test. Replace with a new part, if necessary.
Relays — Test. Replace if necessary.
Fuse 10 years Replace with new part.
Aluminum electrolytic
capacitor on circuit
board
5 years
Test. Replace with new circuit board, if nec-
essary.
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