Mitsubishi Electric HG-KN, Instruction Manual

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2. INSTALLATION
2 - 6
2.7 Inspection items
WARNING
Before starting maintenance and/or inspection, turn off the power and wait for 15
minutes or more until the charge lamp turns off. Otherwise, an electric shock may
occur. In addition, when confirming whether the charge lamp is off or not, always
confirm it from the front of the servo amplifier.
To avoid an electric shock, only qualified personnel should attempt inspections.
For repair and parts replacement, contact your local sales office.
CAUTION
Do not perform insulation resistance test on the servo motor. Otherwise, it may
cause a malfunction.
Do not disassemble and/or repair the equipment on customer side.
It is recommended that the following points periodically be checked.
(1) Check the bearings, brake section, etc. for unusual noise.
(2) Check the cables and the like for scratches or cracks. Especially when the cable is movable, perform
periodic inspections according to operating conditions.
(3) Check the servo motor shaft and coupling for misalignment.
(4) Check the power connector and encoder connector tightening screws for looseness.
2.8 Parts having service life
Service life of the following parts is listed below. However, the service life varies depending on operating
methods and environment. If any fault is found in the parts, they must be replaced immediately regardless of
their service life. For parts replacement, please contact your local sales office.
Part name Life guideline
Bearings
20,000 hours to
30,000 hours
Encoder
20,000 hours to
30,000 hours
Oil seal 5000 hours
(1) Bearings
When the motor is run at rated speed under rated load, bearings should be exchanged in 20,000 to
30,000 hours as a guideline. This differs on the operating conditions. The bearings must also be
changed if unusual noise or vibration is found during inspection.
(2) Oil seal
Oil seals must be changed in 5,000 hours of operation at rated speed as a guideline. They must also be
changed if oil leakage, etc. is found during inspection.
The functions have no problem even if an oil seal may sound during operation.