Periodical Checks; Parts Having Service Life; Restrictions When Using The Equipment At Altitudes Exceeding 1000 M And Up To 2000 M Above Sea Level - Mitsubishi Electric HG-MR Instruction Manual

2. INSTALLATION
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 inspection according to operating conditions.
(3) Check the servo motor shaft and coupling for misalignment.
(4) Check the power supply connector and encoder connector tightening screws for looseness.

2.9 Parts having service life

Service life of the following parts are listed below. However, the service life varies depending on operation
and environment. If any fault is found in the parts, they must be replaced immediately regardless of their
service lives. For parts replacement, please contact your local sales office.
(1) Bearings
When the servo 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 (including oil seal used on the reducer)
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.
2.10 Restrictions when using the equipment at altitudes exceeding 1000 m and up to 2000 m above sea
level
As heat dissipation effects decrease in proportion to decreasing air density, use the equipment within the
effective load ratio and regenerative load ratio shown in the following figure.
Part name Life guideline
Bearings 20,000 hours to
30,000 hours
Encoder 20,000 hours to
30,000 hours
Cooling fan 20,000 hours
Oil seal 5000 hours
Reducer 10,000 hours to
20,000 hours
[%]
100
95
0
0
1000 2000
Altitude
2 - 6
[m]