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8 Maintenance
MITSUBISHI CNC
8.2 Service Parts
A guide to the part replacement cycle is shown below. Note that these will differ according to the working conditions or
environmental conditions, so replace the parts if any abnormality is found. Contact Mitsubishi branch or your dealer for
repairs or part replacements.
[1] Power smoothing capacitor:
The characteristics of the power smoothing capacitor will deteriorate due to the effect of ripple currents, etc. The
capacitor life is greatly affected by the ambient temperature and working conditions. However, when used
continuously in a normal air-conditioned environment, the service life will be ten years.
[2] Relays:
Contact faults will occur due to contact wear caused by the switching current. The service life will be reached after
100,000 cumulative switches (switching life) although this will differ according to the power capacity.
[3] Servo motor bearings:
The motor bearings should be replaced after 20,000 to 30,000 hours of rated load operation at the rated speed.
This will be affected by the operation state, but the bearings must be replaced when any abnormal noise or vibration
is found in the inspections.
[4] Servo motor oil seal, V-ring:
These parts should be replaced after 5,000 hours of operation at the rated speed. This will be affected by the
operation state, but these parts must be replaced if oil leaks, etc., are found in the inspections.
Part name Standard replacement time Remarks
Servo
drive unit
Smoothing capacitor 10 years
The standard replacement time is
a reference. Even if the standard
replacement time is not reached,
the part must be replaced if any
abnormality is found.
Cooling fan 10,000 to 30,000 hours (2 to 3 years)
Battery
10,000 hours
(for ER6V-C119B / MDS-BTBOX-36)
Servo motor
Bearings 20,000 to 30,000 hours
Encoder 20,000 to 30,000 hours
Oil seal, V-ring 5,000 hours